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BRITISH STANDARD | | | | | BS EN 10271:1999 | | | | | | | | | Electrolytically zinc-nickel (ZN) coated steel flat products Ð Technical delivery conditions | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The E uropean Standard E N 02 71 : 998 has the status of a | | British Standard | | | | | | | | IC S 77 40 | | | | | | | | NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW | | | | | Confirmed March 2009 BS EN 10271:1999 National foreword This British Standard is the English language version of EN 10271:1998 The UK participation in its preparation was entrusted by Technical Committee ISE/10, Flat rolled steel products, to Subcommittee ISE/10/8, Coated steel flat rolled products, which has the responsibility to: Ð aid enquirers to understand the text; Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK A list of organizations represented on this subcommittee can be obtained on request to its secretary Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages to 12, an inside back cover and a back cover This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 March 1999 BSI 03-1999 ISBN 580 30856 Amendments issued since publication Amd No Date Text affected EN 10271 EUROPEAN STANDARD NORME EUROPÊENNE EUROPẰISCHE NORM November 1998 ICS 77.140.50 Descriptors: Steel products, metal plates, cold rolled products, coated metal, galvanizing, nickel coatings, electrodeposited coatings, designation, chemical composition, grades: quality, mechanical properties, surface treatment, inspection, tests, marking English version Electrolytically zinc-nickel (ZN) coated steel flat products Ð Technical delivery conditions Produits plats en acier, reveÃtus de zinc-nickel (ZN) par voie eÂlectrolytique Ð Conditions techniques de livraison Flacherzeugnisse aus Stahl mit elektrolytisch abgeschiedenen Zink-Nickel(ZN)-UÈberzuÈgen Ð Technische Lieferbedingungen This European Standard was approved by CEN on November 1998 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CEN European Committee for Standardization Comite EuropeÂen de Normalisation EuropaÈisches Komitee fuÈr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 10271:1998 E Page EN 10271:1998 Foreword This European Standard has been prepared by Technical Committee ECISS/TC 27, Surface coated flat products Ð Qualities, dimensions, tolerances and specific tests, the Secretariat of which is held by DIN This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 1999, and conflicting national standards shall be withdrawn at the latest by May 1999 ECISS/TC 27 met on 1996-11-26 in DuÈsseldorf and agreed on the text for submission of this draft European Standard to Formal Vote The following countries were represented in that meeting: Austria, Belgium, France, Germany, Netherlands and United Kingdom According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom Contents Foreword Scope Normative references Definitions Designation Requirements 5.1 General 5.2 Steelmaking and manufacturing processes 5.3 Deoxidation 5.4 Chemical composition 5.5 Delivery condition 5.6 Choice of properties 5.7 Mechanical properties 5.8 Stretcher strain marks 5.9 Coatings 5.10 Adhesion of coating 5.11 Surface characteristics 5.12 Surface treatment (Surface protection) 5.13 Applications 5.14 Mass, tolerances on dimensions and shape Testing 6.1 General 6.2 Test units 6.3 Number of tests 6.4 Sampling 6.5 Test methods 6.6 Retests 6.7 Inspection documents Marking Packing Storage and transportation 10 Information to be supplied by the purchaser Annex A (informative) Bibliography Annex B (normative) Reference method for determination of the zinc-nickel coating mass and the zinc-nickel coating composition Page 3 4 4 4 4 7 7 8 8 8 9 9 9 10 11 11 BSI 03-1999 Page EN 10271:1998 Scope Normative references 1.1 This European Standard specifies requirements for This European Standard incorporates by dated or continuously electrolytic zinc-nickel coated cold rolled undated reference provisions from other publications These normative reference are cited at the appropriate flat products of low carbon steels suitable for cold places in the text and the publications are listed forming according to Table and Table in rolled widths $ 600 mm and thicknesses from 0.35 mm up to hereafter For dated references, subsequent amendments to or revisions of any of these and including mm, delivered as strip (in coil form), publications apply to this draft European Standard sheet, slit strip or cut lengths obtained from slit strip only when incorporated in it by amendment or or sheet The coating is composed of Zn with a revision For undated references, the latest edition of Ni-content of 10.5 % to 13 % the publication referred to applies 1.2 This European Standard may also be applied to ENV 606, Bar coded transport and handling labels for the coating requirements of continuously electrolytic steel products zinc-nickel coated cold rolled flat products of: EN 10002-1, Metallic materials Ð Tensile testing a) steels according to EN 10139 (cold rolled strip in Part 1: Method of testing (at ambient temperature) rolled widths < 600 mm); [including Addendum AC1:1990] b) other types of low carbon steel for cold forming; EN 10002-2, Metallic materials Ð Tensile testing Ð c) steels normally characterized by minimum yield Part 2: Verification of the force measuring system of strength values in addition to formability parameters, the tensile testing machines e.g: EN 10002-4, Metallic materials Ð Tensile testing Ð Ð steels with high yield strength and improved Part 4: Verification of extensometers used in uniaxial formability according to EN 10268 or other testing microalloyed steels; EN 10020, Definition and classification of grades of Ð rephosphorized steels and bake-hardening steel steels; EN 10021, General technical delivery requirements for Ð general purpose structural steels steel and iron products EN 10027-1, Designation systems for steels Ð 1.3 By special agreement at the time of ordering this Part 1: Steel names, principal symbols European Standard may be applied to the coating requirements of continuously electrolytic zinc-nickel EN 10027-2, Designation systems for steels Ð coated hot-rolled steel flat products (e.g according Part 2: Numerical system to EN 10025, EN 10111, EN 10149-1 to EN 10149-3 etc.) EN 10079, Definition of steel products 1.4 The coating masses, surface qualities and surface EN 10130, Cold rolled low carbon steel flat products for finishes are given in 5.9, 5.11 and Table As the mass cold forming Ð Technical delivery conditions of the zinc-nickel coating applied is relatively small, the EN 10131, Cold-rolled non-coated flat products in low material is not intended to withstand outside exposure carbon steel for cold forming Ð tolerances on without further chemical treatment and painting dimensions and shape 1.5 This European Standard is not applicable to EN 10139, Cold rolled uncoated low carbon steel strip for cold forming Ð Technical delivery conditions Ð hot-dip zinc coated steel strip and sheet (see EN 10142 and EN 10147); EN 10204, Metallic products Ð Types of inspection documents (includes amendment A1:1995) Ð electrolytically zinc coated cold rolled flat products (see EN 10152); EN 10268, Cold-rolled flat products made of high yield strength steels for cold forming Ð General technical Ð continuously hot-dip aluminium-silicon (AS) delivery conditions coated steel strip and sheet (see EN 10154); CR 10260 ECISS IC 10, Designation systems for steel Ð Ð continuously organic coated steel flat products Additional symbols for steel names (see EN 10169); Ð continuously hot-dip zinc-aluminium (ZA) coated EURONORM 12 (1955) 1) , Bend test for steel sheet and strip less than mm thick steel strip and sheet (see EN 10214); Ð continuously hot-dip aluminium-zinc (AZ) coated ISO 10113, Metallic materials Ð Sheet and strip Ð Determination of plastic strain ratio steel strip and sheet (see EN 10215) ISO 10275, Metallic materials Ð Sheet and strip Ð Determination of tensile strain hardening exponent 1) Until they are transformed into European Standards, either the EURONORMS referred to or the corresponding national standards may be applied BSI 03-1999 Page EN 10271:1998 Definitions Requirements 3.1 electrolytic zinc-nickel coating (ZN) The requirements according to 5.2 to 5.5 and 5.13 apply to the steel substrates given in Table and Table For other steels used as substrate for electrolytically deposited coatings of zinc-nickel (see 1.2 and 1.3 ) the requirements shall be based on the appropriate quality standard for the non-coated steel product For the purposes of this European Standard the following definition applies in addition to the definitions in EN 10020, EN 10021, EN 10079 and EN 10204 application of a zinc-nickel coating by electrolysis on a suitably prepared steel surface from an aqueous salt solution by the use of an electric current NOTE Flat products may have a zinc-nickel coating on one or both surfaces If both surfaces are zinc-nickel coated, a different coating thickness may be applied on each side (this process being referred to as differential zinc-nickel coating) Designation 4.1 The steel names are allocated in accordance with EN 10027-1 and CR 10260 Ð the steel numbers are allocated in accordance with EN 10027-2 4.2 The products covered by this European Standard shall be designated as follows in the order given: a) type of product (e.g strip, sheet, cut length); b) number of this standard (EN 10271); c) steel name or steel number and symbol for the type of electrolytically coating (see Table and Table 2); d) numbers denoting the minimum coating thickness on each surface (e.g 50/50 = minimum coating thickness of 5.0 mm on each surface, see Table 3, 5.9.2 , 5.9.4 and 5.9.5 ); e) letters A or B indicating the surface quality (see 5.11.2 ); f) letters denoting the surface treatment (see 5.12 and Table 4) Example 1: Designation of strip made of steel DC03+ZN, (1.0347+ZN), electrolytically zinc-nickel coated with a nominal thickness of 5.0 mm on each surface (50/50), surface quality A, surface treatment oiled (O): Strip EN 10271-DC03+ZN50/50-A-O or Strip EN 10271-1.0347+ZN50/50-A-O Example 2: Designation of sheet made of steel DC05+ZN (1.0312+ZN), electrolytically zinc-nickel coated with a nominal thickness of 5.0 mm on one surface and of 2.0 mm on the other surface (50/20), surface quality B, surface treatment oiled (O) Sheet EN 10271-DC05+ZN50/20-B-O or Sheet EN 10271-1.0312+ZN50/20-B-O 4.3 Where appropriate, additional information to the designation as specified in 4.2 shall be given to describe clearly the delivery requirements (see clause 10) 5.1 General 5.2 Steelmaking and manufacturing processes Unless otherwise agreed at the time of ordering, the steelmaking and manufacturing processes are left to the discretion of the manufacturer The purchaser shall be informed of these processes, if he requires it 5.3 Deoxidation The method of deoxidation shall be in accordance with that specified in Table and Table 5.4 Chemical composition The chemical composition based on ladle analysis shall be as given in Table and Table 5.5 Delivery condition The steel substrates are normally supplied in the skin-passed condition By agreement at the time of the enquiry and order non skin-passed products may be supplied 5.6 Choice of properties The products covered by this European Standard shall comply with the requirements of Table and Table By agreement they may be delivered as suitable for making a particular part; in this case a maximum percentage of scrap may be agreed and acceptance on the basis of mechanical properties is not applicable 5.7 Mechanical properties 5.7.1 The mechanical properties are given in Table and Table NOTE The properties in Table are those specified for cold rolled non-coated low carbon steel flat products according to EN 10130 with the exception of the Re , A80 and n90 values for the grades DC04+ZN, DC05+ZN and DC06+ZN which have been altered with respect to the influence of the electrolytical treatment on those properties The mechanical properties are valid for the period specified in Table and Table from the date on which the products are made available The date of availability shall be notified to the purchaser with reasonable prior notice compatible with the validity of the mechanical properties Prolonged storage of products of grade DC01+ZN could result in some change in the mechanical properties leading to a reduction in formability BSI 03-1999 BSI 03-1999 +ZN 1.0347 1.0338 1.0312 1.0873 DC03 DC04 DC05 DC06 Alloy quality steel Fully killed months Non-alloy Manufacturer's Ð quality steel7) discretion Ð Non-alloy Fully killed months quality steel7) months Non-alloy Fully killed months quality steel7) months Non-alloy Fully killed months quality steel7) months months months months months months B A B A B no limit months months B A A Ð A 9) /190 8) /190 8) /220 8) /240 8) /280 10) 270 to 350 270 to 330 270 to 350 270 to 370 270 to 410 N/mm2 N/mm2 2) Rm Re 37 38 36 34 28 3),12) 0.180 0.160 Ð 4), 12) n90 0.06 0.08 0.10 0.12 C S Mn 0.020 0.020 0.25 0.025 0.025 0.35 0.030 0.030 0.40 0.035 0.035 0.45 0.045 0.045 0.6 P 0,3 11) Ti Chemical composition (ladle analysis, % max.) r4) , 5) , 12) n4) , 12) min 1.6 0.190 0.02 1.6 1.4 1.2 Ð 4), 5), 12) A80 % r90 1) months B no limit The mechanical properties apply only to products which have been skin-passed before coating 2) The values of yield stress shall be the 0.2 % proof stress (R p0,2 ) for products which not present a definite yield point and the lower yield stress (ReL) for the others When the thickness is less than or equal to 0.7 mm but greater than 0.5 mm the values for yield stress shall be increased by 20 N/mm For thicknesses less than or equal to 0.5 mm the values shall be increased by 40 N/mm2 3) When the thickness is less than or equal to 0.7 mm but greater than 0.5 mm the minimum values for elongation shall be reduced by units For thicknesses less than or equal to 0.5 mm the minimum values shall be reduced by units 4) The values of r and n or r and n (see ISO 10113 and ISO 10275) only apply to products of thickness equal to or greater than 0.5 mm 90 90 5) When the thickness is over mm the value for r or r is reduced by 0.2 90 6) It is recommended that products in grade DC01+ZN should be formed within weeks from the time of their availability 7) Unless otherwise agreed at the time of the enquiry and order DC01+ZN, DC03+ZN, DC04+ZN and DC05+ZN may be supplied as alloy steels (for example with boron or titanium) 8) For design purposes the lower limit of R for grades DC01+ZN, DC03+ZN, DC04+ZN and DC05+ZN may be assumed to be 140 N/mm e 9) For design purposes the lower limit of R for grade DC06+ZN may be assumed to be 120 N/mm e 10) The upper limit of R of 280 N/mm2 for grade DC01+ZN is valid only for days from the time of the availability of the product e 11) Titanium may be replaced by niobium Carbon and nitrogen shall be completely bound 12) For double side coatings of 5.0 m m and above the r- , n- and A-values shall be agreed at the time of ordering +ZN +ZN +ZN +ZN DC01 6) 1.0330 Absence Definition Deoxidation Validity of Surface of mechanical appearance and stretcher properties classification strain according to marks Steel Steel Symbol for EN 10020 name number the type of electrolytical coating Designation Steel grade Table Ð Chemical composition and mechanical properties of electrolytically zinc-nickel double side coated mild steel flat products *)1) Page EN 10271:1998 +ZN 1.0347 1.0338 1.0312 1.0873 DC03 DC04 DC05 DC06 Alloy quality steel Fully killed Non-alloy Fully killed quality steel8) Non-alloy Fully killed quality steel8) Fully killed Non-alloy quality steel8) Non-alloy Manufact quality steel8) urer's discretion B A B A B months months months months months A B A Ð months months A Ð no limit months months months months months months months Ð 10) /190 9) /190 9) /220 9) /240 9) /280 11) 270 to 350 270 to 330 270 to 350 270 to 370 270 to 410 N/mm2 N/mm2 3) Rm Re 37 39 37 34 28 4) A80 % r5) , 6) 1.8 1.9 1.6 1.3 Ð 5), 6) r90 n5) 0.200 0.190 0.160 Ð 5) n90 0.02 0.06 0.08 0.10 0.12 C S Mn 0.020 0.020 0.25 0.025 0.025 0.35 0.030 0.030 0.40 0.035 0.035 0.45 0.045 0.045 0.6 P 0,3 12) Ti Chemical composition (ladle analysis, % max.) 1) months B no limit The mechanical properties apply only to products which have been skin-passed before coating 2) The mechanical properties apply only to products which have the coatings removed before testing 3) The values of yield stress shall be the 0.2 % proof stress (R p0,2 ) for products which not present a definite yield point and the lower yield stress (ReL) for the others When the thickness is less than or equal to 0.7 mm but greater than 0.5 mm the values for yield stress shall be increased by 20 N/mm For thicknesses less than or equal to 0.5 mm the values shall be increased by 40 N/mm 4) When the thickness is less than or equal to 0.7 mm but greater than 0.5 mm the minimum values for elongation shall be reduced by units For thicknesses less than or equal to 0.5 mm the minimum values shall be reduced by units 5) The values of r and n or r and n (see ISO 10113 and ISO 10275) only apply to products of thickness equal to or greater than 0.5 mm 90 90 6) When the thickness is over mm the value for r or r is reduced by 0.2 90 7) It is recommended that products in grade DC01+ZN should be formed within weeks from the time of their availability 8) Unless otherwise agreed at the time of the enquiry and order DC01+ZN, DC03+ZN, DC04+ZN and DC05+ZN may be supplied as alloy steels (for example with boron or titanium) 9) For design purposes the lower limit of R for grades DC01+ZN, DC03+ZN, DC04+ZN and DC05+ZN may be assumed to be 140 N/mm e 10) For design purposes the lower limit of R for grade DC06+ZN may be assumed to be 120 N/mm e 11) The upper limit of R of 280 N/mm2 for grade DC01+ZN is valid only for days from the time of the availability of the product e 12) Titanium may be replaced by niobium Carbon and nitrogen shall be completely bound +ZN +ZN +ZN +ZN DC01 6) 1.0330 Designation Steel grade Absence Definition Deoxidation Validity of Surface of mechanical appearance and stretcher properties classification strain according to marks Steel Steel Symbol for EN 10020 name number the type of electrolytical coating Table Ð Chemical composition and mechanical properties of electrolytically zinc-nickel single side and differential coated mild steel flat products *) 1) 2) Page EN 10271:1998 BSI 03-1999 Page EN 10271:1998 5.7.2 The tensile test shall be carried out according to 5.9.6 A maximum value (single spot test) for the the relevant standards for the substrate (e.g location of coating mass per surface of the product may be agreed samples) The tensile test values apply to transverse upon for each coating designation samples and relate to the test piece cross-section Table Ð Electrolytic zinc-nickel coatings without zinc-nickel coating (see also 5.9.4 and 5.9.5 ) Testing shall be carried out after coating Double side Coating Minimum zinc-nickel coating values coated products shall be tested with coating, single designation for each surface 1) 2) 3) side coated products shall have the coating removed Thickness Mass before testing 5.8 Stretcher strain marks All products are generally subjected to a light skin-pass after annealing and before coating at the manufacturer's works to avoid the formation of stretcher strain marks The tendency to form such marks reappears a certain time after the skin-pass It is therefore in the purchaser's interest to form the products as soon as possible Products of grade DC06+ZN not exhibit stretcher strain marks The manufacturer shall ensure the absence of stretcher strain marks: Ð for months after products of grades DCO3+ZN, DC04+ZN and DC05+ZN are made available, for surface qualities A and B; Ð for months after products of DC01+ZN are made available, for surface quality B 5.9 Coatings 5.9.1 Zinc-nickel coatings as given in Table are applicable for equally coated products 5.9.2 In the designation the coating is expressed as ten times the minimum coating thickness in mm, indicated separately for either surface of the product (see 4.2 d)) 5.9.3 The coatings shall be checked by determining the mass of zinc-nickel coating per square metre on each surface (see 6.4.4 and 6.5.4) Each result shall meet the requirements for the minimum coating mass according to Table 5.9.4 Differential coatings based upon a combination of the coatings mentioned in Table may be available, subject to agreement between manufacturer and purchaser They shall be designated as follows: ZN50/20 etc When differential coatings are supplied the manufacturer shall indicate which surface has the greater coating thickness, i.e the top or the bottom surface of the sheets, inside or outside of the coil 5.9.5 Material may be supplied, subject to agreement between manufacturer and purchaser, with coating on one surface only Such coatings shall be designated as follows: ZN50/00 etc Slight zinc-nickel coatings may appear within a distance of 10 mm from the edges of the uncoated surface (wrapped around) A maximum value for the permissible residual coating mass on the uncoated surface shall be agreed at the time of enquiry and order BSI 03-1999 ZN 20/20 ZN 30/30 ZN 40/40 ZN 50/50 ZN 60/60 2.0 3.0 4.0 5.0 6.0 mm 15 22 29 37 44 g/m2 1) A coating thickness of mm corresponds to a coating mass of approximately 7.3 g/m2 2) See 6.4.4 and 6.5.4 3) A nominal coating can be specified by agreement In this case, the minimum zinc-nickel coating shall also be agreed at the time of enquiry and order 5.10 Adhesion of coating The adhesion of the coating shall be tested using the method specified in 6.5.3 After bending, the coating shall show no signs of flaking at the outer side of the bend, but an area of mm from each edge of the specimen shall be disregarded in order to exclude the effect of the cutting Crazing and roughening are permissible 5.11 Surface characteristics 5.11.1 General The surface characteristics consist of the surface quality and the surface finish The surface quality and finish shall be specified by the purchaser at the time of the order (see 4.2 ) 5.11.2 Surface quality 5.11.2.1 The products shall be supplied with either of the surface qualities A or B: Ð Surface quality A: defects such as pores, slight indentations, small marks, minor scratches and slight colouring which not effect formability or the application of subsequent surface coatings are permitted Ð Surface quality B: the better of the two surfaces shall be virtually free from surface imperfections liable to impair the uniform appearance of a high-quality paint finish For one-sided coating, this requirement shall apply for the uncoated surface unless otherwise agreed The other surface shall at least conform to surface quality A Unless otherwise agreed, a single surface of the sheet shall be inspected and shall comply with the requirements The other surface shall be such that during subsequent treatment it does not have a deleterious effect on the surface inspected Page EN 10271:1998 5.11.2.2 When supplying strip in coils, there is greater risk of surface defects than if sheet and cut lengths are supplied as it is not possible for the manufacturer to eliminate all the defects in a coil This shall be taken into account by the purchaser when evaluating the products 5.11.3 Surface finish By agreement at the time of the enquiry and order ranges for surface roughness (Ra values) may be specified for specific end uses 5.12 Surface treatment (Surface protection) One of the types of surface treatment given in Table shall be agreed at the time of enquiry and order Normally, electrolytically zinc-nickel coated strip and sheet are delivered oiled (O) Oiling (O) reduces the risk of corrosion occurring during transport and storage, which is mainly due to humidity It shall be possible to remove the oil layer with suitable detergents not attacking the zinc-nickel coating It is assumed that the processor has all the equipment necessary for degreasing the products Table Ð Types of surface Symbol O P PC C PCO CO PO treatment1) Type of treatment Oiled Phosphated Phosphated and chemically sealed Chemically passivated Phosphated, chemically sealed and oiled Chemically passivated and oiled Phosphated and oiled 1) The type of surface treatment shall be agreed upon at the time of enquiry and order 5.13 Applications 5.13.1 Welding The product is suitable for welding under conditions laid down for the base metal However, precautions may be necessary to overcome the presence of the zinc-nickel coating and, where applied, the phosphate on the surface of the product 5.13.2 Painting Zinc-nickel coated steel is a suitable base for paint, but the first treatment may be different from those used for uncoated steel Pre-treatment primers, chemical conversion coatings and primers specially formulated for direct application to zinc-nickel surfaces are all appropriate first treatments for electrolytically zinc-nickel coated steel In drawing up a surface preparation and painting schedule, consideration should be given by the purchaser as to whether the material should be supplied chemically passivated or phosphated and/or oiled (see also 5.12 ) 5.13.3 Forming Electrolytic zinc-nickel coatings are usually tightly adherent even when used for difficult formings However, powdering can occur if the product is overformed or ªcoinedº during fabrication Care should be taken to ensure that the speed of forming and the clearance of dies is carefully controlled 5.14 Mass, tolerances on dimensions and shape 5.14.1 The product mass shall be calculated taking the density of the steel as 7.85 kg/dm3 and the density of the zinc-nickel coating as 7.3 kg/dm3 5.14.2 For the tolerances on dimensions and shape EN 10131 applies The application of other dimensional standards shall be specially agreed at the time of enquiry and order Testing 6.1 General 6.1.1 The purchaser shall specify at the time of the enquiry and order his requirements for: Ð type of testing: specific or non-specific (see EN 10021); Ð type of inspection document (see EN 10204) 6.1.2 Specific testing shall be carried out in accordance with 6.2 to 6.6 6.1.3 Specific testing may not be specified either for the product analysis or the surface finish However by agreement at the time of enquiry and order the manufacturer may supply a certificate of compliance with the order 6.2 Test units The test unit consists of 20 t or a fraction of 20 t of electrolytically zinc-nickel coated flat products of the same grade and nominal thickness, coating type and surface characteristics In the case of strip, a coil with a mass of more than 20 t is regarded as one test unit 6.3 Number of tests One series of tests shall be carried out per test unit as specified in 6.2 to determine: Ð the mechanical properties (see 6.5.1 ); Ð the r- and n-values if specified in Tables and (see 6.5.2 ); Ð the adhesion of the coating (see 6.5.3 ); and Ð the coating mass (see 6.5.4) BSI 03-1999 Page EN 10271:1998 6.4 Sampling 6.4.1 In the case of strip, the samples shall be taken from the beginning or end of the coil In the case of sheet and cut lengths, the selection of the sample shall be left to the discretion of the inspector carrying out the inspection tests 6.4.2 The sample for the tensile test (see 6.5.1 ) shall be taken transversely to the direction of rolling at a distance of at least 50 mm from the edges of the product 6.4.3 The sample for the bend test to determine the adhesion of the coating (see 6.5.3 ) may be taken in any direction The distance from the product edges shall be at least 50 mm The size of the sample shall be such that the length of the folded edge is at least 100 mm 6.4.4 One sample for testing the coating mass (see 6.5.4) with an area of at least 000 mm2 shall be taken at a distance of at least 50 mm from the edges of the product 6.4.5 All the samples shall be taken and machined, if necessary, in such a way that the results of the tests are not affected 6.5 Test methods 6.5.1 The tensile test shall be carried out as described in EN 10002-1 using type test pieces (original gauge length L0 = 80 mm, width b = 20 mm) as described in EN 10002-1 (see also 5.7.2 ) 6.5.2 The determination of the plastic strain ratio r and the strain hardening exponent n shall be carried out in accordance with ISO 10113 and ISO 10275 The plastic strain ratio r and the strain hardening exponent n are determined within the strain range of 10 % to 20 % As the determination shall be carried out in the range of homogeneous deformation, then if the uniform elongation of the tested material is lower than 20 %, values for the upper limit of the strain range of 15 % to 20 % can be applied 6.5.3 The bend test to determine the adhesion of the coating (see also 5.10 and 6.4.3 ) shall be carried out as described in EURONORM 12 The diameter D of the mandrel or bending roll shall be O (flat on itself) for the steels covered by Table and shall be by agreement between the manufacturer and the purchaser for other steel types The angle of bend shall be 1808 in all cases When pressing together the two legs of the test piece, care shall be taken that the coating is not damaged 6.5.4 The coating mass shall be determined from the difference in mass of the sample before and after the coating has been removed chemically BSI 03-1999 Other methods Ð e.g non-destructive tests Ð may be used for continuous checks at the manufacturer's works In cases of dispute, the method described in B.1 of this European Standard shall be used 6.5.5 In cases of dispute, the coating composition shall be determined as described in B.2 6.6 Retests The requirements of EN 10021 shall apply In the case of coils, the retest specimens shall be taken from a distance of at least one lap away, but with a maximum of 20 m from the end of the coil 6.7 Inspection documents If agreed at the time of ordering, one of the inspection documents specified in EN 10204 shall be supplied Marking 7.1 A label shall be attached to each coil or bundle containing at least the following information: Ð name or mark of the manufacturer's works; Ð full designation (see 4.2 ); Ð nominal dimensions of the product; Ð identification number; Ð order number; Ð mass of the lot, coil or bundle Bar coding according to ENV 606 can supplement marking, when the above mentioned minimum information is also given in clear text 7.2 Marking of the products by branding may be agreed upon at the time of ordering Packing The packing requirements for the product shall be agreed at the time of ordering Storage and transportation 9.1 Moisture, in particular condensation between the sheets, laps of the coil or other adjacent parts made of electrolytically zinc-nickel coated flat products may lead to the formation of corrosion products The possible types of surface protection are given in 5.12 However, if there is lengthy contact with moisture, the corrosion protection may be reduced locally As a precaution, the product should be transported and stored dry and protected from moisture 9.2 During transportation, dark spots may appear on the zinc coated surfaces as a result of friction Generally, they only impair the appearance Friction is reduced by oiling the products However, the following precautionary measures should be taken: secure packing, laid flat, no local pressure spots Page 10 EN 10271:1998 10 Information to be supplied by the purchaser The following information is required from the purchaser so that the manufacturer may supply the products to conform with the requirements: a) complete designation (see 4.2 ); b) nominal dimensions (thickness, width and Ð in the case of sheet and cut lengths Ð length); c) quantity; d) limiting mass and sizes of the coils and individual bundles of sheets; e) properties of steels other than those covered by Table and Table (see 5.1 , 5.14.2 and 6.5.3 ); f) any requirement concerning a special steelmaking or manufacturing process (see 5.2 ); g) any products suitable for making a particular part (see 5.6); h) any requirement relating to coating on one surface only (see 5.9.2 ); i) any requirement for a maximum value of the coating mass (see 5.9.6); j) any requirement concerning surface quality and surface finish (see 5.11 ); k) any requirement on surface roughness (see 5.11.3 ); l) any requirement concerning surface treatment (see 5.12 and Table 4); m) any requirement concerning application of a dimensional standard different from EN 10131 (see 5.14.2 ); n) if required, type of testing and inspection document (see 6.1.1 and 6.7); o) any marking desired by branding of the product (see 7.2 ); p) any requirement for packing (see clause 8) BSI 03-1999 Page 11 EN 10271:1998 Annex A (informative) Bibliography EN 10142, Continuously hot-dip zinc coated mild steel strip and sheet for cold forming Ð Technical delivery conditions EN 10147, Continuously hot-dip zinc coated structural steel strip and sheet Ð Technical delivery conditions EN 10152, Electrolytically zinc coated cold rolled steel flat products Ð Technical delivery conditions EN 10154, Continuously hot-dip aluminium-silicon (AS) coated steel strip and sheet Ð Technical delivery conditions EN 10169-1, Continuously organic coated (coil coated) steel flat products Ð Part 1: General information (definitions, materials, tolerances, test methods) ENV 10169-2, Continuously organic coated (coil coated) steel flat products Ð Part 2: Products for building exterior applications EN 10214, Continuously hot-dip zinc-aluminium (ZA) coated steel strip and sheet Ð Technical delivery conditions EN 10215, Continuously hot-dip aluminium-zinc (AZ) coated steel strip and sheet Ð Technical delivery conditions Annex B (normative) Reference method for determination of the zinc-nickel coating mass and the zinc-nickel coating composition B.1 Determination of the zinc-nickel coating mass B.1.1 Principle The sample shall be at least 000 mm2 in area This can be achieved usually by a disc of at least 80 mm in diameter The actual area is A (mm2 ) The loss of mass in grams when dissolved, multiplied by an area- related factor F1 , will represent the zinc-nickel-mass in grams per square metre on each surface of the product For single side determinations the non dissolved side must be protected suitably against the attack of the HCl B.1.2 Reagents Ð inhibited hydrochloric acid (HCl, r20 = 1,19 g/cm3) which is diluted with distilled water (1:1); Ð nitric acid (HNO3, r20 = 1,40 g/cm) B.1.3 Apparatus Analytical balance, measuring accuracy: 0.001 g BSI 03-1999 B.1.4 Procedure a) the sample with the area A is cleaned and weighed (W1 ); b) the coating is removed using the HCl (1:1); the progress of the removal is visually controlled; c) the sample is wiped and rinsed with distilled water; d) the sample is dried and reweighed (W2 ); e) to drops of HNO3 are added to the hydrochloric acid solution which is then heated up until boiling; f) after short boiling the solution is cooled down to ambient temperature Evaluation: Coating weight (g/m2 ) W = (W1 W2 ) ´ F1 000 000 F1 = A B.2 Determination of the zinc-nickel coating composition For the determination of the ZN-coating composition in principle three methods are possible, depending on the lab-facilities and the skill of lab-people The nickel concentration is measured by ICP or FAAS Instead of these spectrometry methods the gravimetric can be used B.2.1 Measurement of nickel-concentration by ICP or FAAS a) the solution, obtained by B.1.4f)), is transfered into a measuring flask and filled up with distilled water to the volume V (ml); 000 F2 = V a) the nickel-concentration (mg/l) is determined with ICP or FAAS using suitable standard solutions Evaluation: Ni (mg/1)´ Fl = % nickel W´ F2 ´10 B.2.2 Determination of nickel by the gravimetric method B.2.2.1 Reagents Ð tartaric acid (500 g/l); Ð dimethylglyoxime (C4H8N2 O2 , 1% ethanol solution); Ð ammonia (NH4OH, r20 = 0,91 g/cm3) B.2.2.2 Apparatus Ð analytical balance, measuring accuracy: 0.001g; Ð filter crucible Duran 4; Ð vacuum filtering device Page 12 EN 10271:1998 B.2.2.3 Procedure The hydrochloric acid solution (see B.1.4f)) is filled up to 250 ml with distilled water and 20 ml each of tartaric acid and dimethylglyoxime are added Then ammonia is added while stirring until the solution is slightly alkaline A red, bulky deposit of Diacetyldioxime (NiC8H14N4O4) is precipitated Then the solution is heated up to about 60 8C and kept at this temperature for about 1h Then the deposit is filtered using the filter crucible weighed in advance The deposit is cleaned by distilled warm water The filter crucible is dried at 120 8C/2h to weight constancy After cooling down to ambient temperature the filter crucible is reweighed The difference between the two weighings M (g) is calculated Evaluation: M(g)´20,32 = % nickel (W1 W2 )(g) BSI 03-1999 blank | | | | | | | | | BSI Ð British Standards Institution | | | | | | | BSI is the independent national body responsible for preparing British Standards It | | presents the UK view on standards in Europe and at the international level It is | | | | | incorporated by Royal Charter Revisions | | British Standards are updated by amendment or revision Users of British Standards | | should make sure that they possess the latest amendments or editions | | | It is the constant aim of BSI 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