Tiêu chuẩn iso 11692 1994 scan

I S0 I N TE R N ATI ON AL S TAN D ARD 1 69 First edition 994-07-l Ferri ti c-pearl i ti c preci pi tati on en g i n eeri n g h ard en i n g from steel s for h ot-worki n g tem peratu res Aciers pour construction mbcanique de type ferrite-perlite apte au durcissement par prbipitation rl partir des tempkatures de formage B chaud Reference number IS0 1 692:1 994(E) I S0 1 : 9 4( E ) Foreword I S0 ( th e I n te rn ati o n al fe d e rati o n of of pre pari n g te ch n i cal wh i ch co m m i tte e s a te ch n i cal on (I E C) on D raft al l m atte rs to S tan d ard th e I n te rn ati o n al An n ex fo r Al l or 7, bo d y be e n wi th I S O, by at fo r ou t in h as take p art Th e wo rk th ro u g h a I S0 s u b j e ct th e o rg an i z ati o n s, al s o wo rl d wi d e ri g h t fo r to be g o ve rn m e n tal in th e E l e ctro te ch n i cal wo rk I S0 Com m i ssi o n s tan d ard i z ati o n ad o p te d bo d i e s carri e d e stabl i sh e d a bo d i e s ) i n te re s te d I n te rn ati o n al e l e ctro te ch n i cal appro val A S tan d ard S te e l , fo rm s i n fo rm ati o n I S0 by th e vo ti n g l e as t 75 te ch n i cal P u bl i cati o n % of th e co m m i tte e s as m em be r an are I n te rn ati o n al bo d i e s cas ti n g an i n te g ral p art was SC of p re p are d 4, th i s H e at by Tech n i cal tre atabl e I n te rn ati o n al an d C o m m i tte e al l oy S tan d ard s te e l s An n ex B is on l y res e rve d u ti l i z e d in an y in P o s tal e U n l e ss fo rm wi th o u t I n te rn ati o n al C as e P ri n te d 11692 I S0 S u b co m m i tte e 994 ri g h ts m i c ro f i l m , ii th e S tan d ard s n o rm al l y I n te rn ati o n al l i so n m em ber re q u i re s is is m em be r vo te l S O/TC in wi th of I n te rn ati o n al ci rcu l ate d h as co m m i tte e cl o se l y S tan d ard i z ati o n ) (I S0 m em ber co m m i tte e th at fo r bod i es S tan d ard s E ach n o n - g o ve rn m e n tal , co l l ab o rate s a s tan d ard s I n te rn ati o n al re p re s e n te d an d Org an i z ati o n n ati on al or o th e rwi s e by an y p e rm i s s i o n O rg an i z ati o n 56 S wi tz e rl an d ? in wri ti n g fo r CH -1 21 s p e c i fi e d , m e an s , no e l e c tro n i c fro m th e part or of p u b l i s h e r S tan d ard i z ati o n G e n bve 20 ? th i s p u b l i c ati o n m e c h a n i c al , S wi tz e rl an d i n cl u d i n g m ay be re p ro d u ce d ph o to co pyi n g an d I N TERN ATI ON AL STAN DARD I SO I S0 Ferri ti c-pearl i ti c en g i n eeri n g h ard en i n g h ot-wo rki n g 1 Th i s cal I S0 I n tern ati on al ste el s l i ste d in co m po si ti o n fo rg i n g by stee l Th e tre atm e n t on e l i ste d tabl e th e spe ci fi e s bi l l ets tabl e s an d th e bars an d in in tabl e tabl e , stee l fo r in in th e h ot ch arac- i n ten d e d l i n es g i ven of ch e m i cal are are su ppl i ed d i ti on s Th e by 77- 2: te ch n i - m ad e i n te n d ed an d are g i ven su rface are l i ste d pro d u cts an d ch aracte ri z e d re q u i re m e n ts co n d i ti on s of in are g rad e s ten si l e m ach i n i n g fo r re q u i re m e n ts Th e te ri z e d S tan d ard re q u i re m e n ts al l o ye d g rad e s preci pi tati on 1989, Selection and preparation of samples and test pieces of wrought steels - Pafl 2: Samples for the determination of the chemical composition d el i very th e for tem peratu res Scope in fro m steel s fo r h e at- to 4, an d Steel and steel products technical delivery requirements I S0 40 4: 9 2, In speci al case s, re q u i re m e n ts th e su bj e ct an d o rd e r In of an ( se e vari ati on s or ag re e m e n t an n ex in ad d i ti o n s Part 1: Di- Hot-rolled steel bars mensions of flat bars Part 3: Di- I S0 035-l : 980, I S0 035-3: 980, I S0 5- 4: 82, tabl e at th ese to tech n i cal th e m th e ti m e m ay of fo rm en q u i ry A) Hot-rolled steel bars - g e n e ral are to te ch n i cal I n tern ati on al d el i very S tan d ard , re q u i re m e n ts of I S0 th e 4948- l Th e th rou g h th i s bols I S0 fo l l o wi n g referen ces stan d ard s re fe re n ce in I n tern ati o n al tai n th i s te xt, S tan d ard provi si on s co n sti tu te At th e wh i ch , provi si on s ti m e are e d i ti on s s u bj e ct base d to th e on to th i s i n ve sti g ate 6506: 981 , of pu bl i - I S0 689 2: 84, I S0 69 29 : 87, classification i n d i cate d revi si on , an d I n tern ati on al th e we re possi bi l i ty val i d parti e s S tan d ard of Al l to are appl yi n g stan d ard s ag re e m e n ts e n co u rag e d th e m ost re - ed i ti o n s M e m be rs rsn tl y val i d of of I EC th e an d I n tern ati on al stan d ard s I S0 m n tai n i n d i cate d re g i ste rs be l o w of cu r- S tan d ard s I S0 77- l Metallic materials Steel products - Steel and iron able methods of analysis Hardness test Tensile testing Definitions and 769 : 9 , Review of avail- Steel and steel products spection documents I S0 :1989, Selection and preparation of samples Samples and test pieces of wrought steels - Part and test pieces for mechanical test Metallic materials - 443 : 9 , I S O /TR ce n t Steel names based on letter sym- Heat-treatable and alloy steels Surface quality c/asses for hot-rolled round bars and wire rods - Technical delivery conditions I S0 cati o n , Tol- : 982, - Brine// test N orm ati ve 4: 40 appl i cabl e of th i s Part Steels - Classification - Part 1: Classification of steels into unalloyed and alloy steels based on chemical composition I S0 I S O /TR 9 : 9 , ad d i ti o n General Hot-rolled steel bars mensions of round bars erances d el i very 1 692: 994(E ) 474: 9 , In- 7: IS0 1 692: IS0 994(E) - Defi n i ti o n s For the purposes of this International Standard, the definitions for the product forms given in IS0 6929 apply The term “alloyed steel” is as defined in IS0 4948-l Ord eri n g an d a nominal length of 000 mm; - a tolerance on diameter of f 0,25 mm (= class S of IS0 035-4); - a tolerance on length of +,$ mm (= class L2 of IS0 035-4); - all other tolerances as given in IS0 035-4, for normal cases Surface d esi g n ati on The designation of the product in an order shall cover the following a) The designation of the product form (bar, billet) followed by - either the designation of the dimensional standard and the dimensions and tolerances selected from it (see 5.6); or - the designation of the drawing or any other document covering the dimensions and tolerances required for the product - Steel - in accordance with this International type 38 MnVS (see table3); - heat-treatment condition: untreated (symbol TU, see table ); - with an inspection IS0 0474) the surface condition (see table2), and - the surface quality (see 5.5) certificate Standard, 3.1 B (see Designation b1 If a surface condition other than “hot worked” or a special surface quality is required - as hot worked (symbol HW, see table2) Rou n d s I S0 Su rface HW Steel I S0 - 035-l 1 692 - 38 25, S Mn VS x 000 TU I.2 - B R eq u i rem en ts c) A description of the steel, comprising 1) a 2) the designation of the steel type given 3) reference to this International Standard; or th e i n tabl e 5; stan d ard d esi g n ati on fo r th e req u i red type IS0 04741 , if an inspection document is required; of i n specti on d ocu m en t (see 4) the symbol and, where necessary, the details of this supplementary requirement (see annex A), if any supplementary requirement shall be complied with EXAMPLE The following are to be ordered Hot-rolled round bars - in accordance with IS0 035-l ; - with a nominal diameter of 25,0 mm; M an u factu ri n g l process G en eral The manufacturing process of the steel and the products is left to the discretion of the manufacturer, with the restrictions given in Al l Deoxi d ati on steel s to sh al l be fu l l y H eat-treatm en t d i ti on Prod u cts on ki l l ed d i ti on H eat-treatm en t of an d su rface d el i very steel s l i sted d i ti on in tabl e3 sh al l be d el i vered in the untreated condition or in the condition “treated to improve shearability” Products of steels listed in table shall be delivered in the precipitation-hardened condition Q IS0 I S0 Su rface Cast separati o n The steels shall be delivered separated by casts Ch em i cal com po si ti o n an d m ech an i cal properti es Where the steels are ordered with the designations given in table3 and the products are to be delivered in the untreated condition, the requirements for chemical composition given in tables and apply In addition, for products to be delivered in the condition “treated to improve shearability”, a maximum Brine1 1hardness of 255 applies NOTE Guidance data for mechanical properties after precipitation hardening are given in table B.l 5.2.2 Where the steels are ordered with the designations given in table5, the requirements for mechanical properties given in this table apply NOTE Guidance data for chemical composition of the steels listed in table are given in table Stru ctu re The steels in table5 are control/cooled from the hot-working temperature to produce a ferriticpearlitic structure Under certain circumstances, small portions of bainite and/or martensite may be present 5.3.2 A.2 5.4 For the content, of non-metallic inclusions, see I n tern al sou n d n ess The steels shall be free from internal defects likely to have an adverse effect (see A.3) 5 5 Su rface Removal of surface discontinuities by welding is not permitted 5 d i ti on Unless otherwise agreed (see table2, lines to 6) at the time of enquiry and order, the products shall be delivered in the as-hot-worked condition 1 692: 994(E) q u al i ty All products shall have a workmanlike finish 5.5.2 At the time of enquiry and order, agreements may be made concerning the required surface quality In the case of round bars, such agreements should be made in accordance with IS0 9443 If surface discontinuities are removed by other methods, the kind of surface discontinuities and permissible deoth for their removal should, where appropriate, be agreed upon at the time of enquin/ and order Sh ape, d i m en si on s an d tol eran ces The shape, dimensions and tolerances of the products shall comply with the requirements agreed upon at the time of enquiry and order The agreements shall, as far as possible, be based on corresponding International Standards or, otherwise, on suitable national standards NOTE For flat and round bars, the following International Standards cover dimensions and/or tolerances for products included in this International Standard: IS0 035-1 , IS0 035-3 and IS0 035-4 of I n specti on , testi n g an d form an ce prod u cts 6.1 types Inspection an d o f i n specti on testi n g proced u res an d d ocu m en ts For each delivery, the issue of any inspection document according to IS0 0474 may be agreed 6.1 upon at the time of enquiry and order 6.1 If, in accordance with the agreements made at the time of enquiry and order, a test report is to be provided, this shall cover: a) the statement that the material complies with the requirements of the order; b) the results of the cast analysis for all elements specified for the type of steel supplied (This also applies to the grades of table 5.) 6.1 If, in accordance with the agreements in the order, an inspection certificate 3.1 A, 3.1 or 3.1 C or an inspection report 3.2 (see IS0 0474) is to be provided,’ the specific inspections and tests described in 6.2 shall be carried out and their results shall be certified in the document In addition the document shall cover a) the results of the cast analysis provided by the manufacturer for all elements specified for the steel type concerned (this also applies to the grades of table 5); I S0 o 1 692: 994(E) b) the results of all inspections supplementary requirements c) and tests ordered by (see annex A); wise agreed For flat bars and for billets, the details of verification are to be agreed upon at the time of enquiry and order the symbol letters or numbers connecting the inspection documents, the test pieces and products to each other Speci fi c 6.2.1 i n specti on Veri fi cati on of th e an d 6.2.3 Vi su al an d d i m en si on al i n specti on A sufficient number of products shall be inspected ensure compliance with the specification testi n g m ech an i cal I S0 to properti es 6.2.4 Unless otherwise agreed, only the mechanical properties according to table shall be verified for steels ordered with the designation given in this table Retests For retests, The amount of testing, the sampling conditions and the test methods used for the verification of the requirements shall be as given in table6 IS0 404 shall apply 6.2.2 Testi n g of th e su rface The manufacturer shall mark the products or the bundles or boxes containing the products in a suitable way, so that the identification of the cast, the steel type and the origin of the delivery is possible (see A.5) q u al i ty For round bars, the verification of the surface quality shall be in accordance with IS0 9443, unless other- Tabl e - Com bi n ati on s of u su al appl i cati on ) h s at-treatm en t an d d i ti on s req u i rem en ts H eat-treatm en t on accord i n g I M arki n g to d el i very, tabl es form s (an d th ei r r- d i ti on prod u ct to on x i n d i cates appl i cabl e fo r d el i very Appl i cabl e bi l l ets an d bars req u i rem en ts bars fo r Sym bo l fo r h ot forg i n g m ach i n i n g None or TU X - Chemical composition according to tables and Treated to improve shearability TS X - Chemical composition according to tables and and maximum Brinell hardness according to 5.2.1 Precipitation hardened TP - Untreated X Mechanical properties according to table The chemical composition given in table3 is given for guidance only I S0 Tabl e 2 - Su rface d i ti on I on d el i very I I U n l e ss d i ti on on d el i very h ot in g en eral appl i cabl e fo r Sym bo l bars bi l l ets X X X X X X o th e rwi s e As I x i n d i cates Su rface 1 692: 94(E ) wo rke d N on e or HW ag re e d H Wl ) P arti cu l ar su ppl i e d t p i ckl e d HW t bl as t HW t s u rface PI cl e an e d by ag re e - - X re - m en t m o val ) Oth e rs ) H W: 2) Th e Tab l e h o1 wo rke d type - of s u rface Types of re m o val steel m ay an d be ag re e d speci fi ed u po n , fo r ch em i cal bars Typ e BC co n d i ti o n s o f steel e xam pl e , re fe re n ce com posi ti on fo r h ot th e re l e van t (appl i cabl e to d i m e n si o n al cast an al ysi s) s tan d ard fo r com posi ti on [% (m /m ) ] ) s3’ 1I M n VS 0, to 0, 22 0, 80 30 M n VS 0, 26 to 0, 33 0, 80 38 M n VS 0, 34 to , 41 0, 80 46 M n VS , 42 to , 49 0, 80 46 M n VS , 42 to , 49 80 E l e m e n ts th e 2) 3) to 4) n ot p u rpo s e m ate ri al Th e u sed in Som e limit or of th e m an u factu re , are Th e al l sh o u l d fi n i sh i n g e l e m e n ts ag re e m e n t l o we r q u o te d of n am e s Oth e r an d N am e2) N u m ber fo r bi l l ets forg i n g Ch em i cal d esi g n ati on to of in n ot h e at of acco rd an ce m ay be su l fu r th e van ad i u m sh al l al s o re as o n abl e wi th to m ay van ad i u m i n ten ti on al l y Al l e l e m e n ts ad d e d ran g e be l S O/TR i m p ro ve al s o co n te n t be wh i ch be , 20 I,20 I,20 0, 60 ad d e d to affe ct th e I,60 to I,60 to “” 0, 035 0, 020 to 0, 060 0, 08 to 0, 20 0, 035 0, 020 to 0, 060 0, 08 to 0, 20 to , 60 0, 035 0, 020 to 0, 060 0, 08 to 0, 20 to 60 0, 035 0, 020 to 0, 060 0, 08 to 0, 20 to , 00 0, 035 0, 020 to 0, 060 0, 08 to 0, 20 th e pre cau ti o n s s te e l sh o u l d wi th ou t be h ard e n abi l i ty, th e take n to ag re e m e n t pre ve n t m e ch an i cal th e of th e pu rch as e r, ad d i ti o n , pro p e rti e s an d fro m o th e r s crap or th an o th e r appl i cabi l i ty 49 49 m ach i n abi l i ty s u b j e ct m ay s u b j e ct 1,20 I be to to (or to co n tro l su l fi d e m o rph o l o g y an d oxi d e fo rm ati o n ) , s u b j e ct ag re e m e n t re pl ace d by n i o bi u m or ti tan i u m , s u b j e ct to ag re e m e n t In th i s cas e , th e ag re e m e n t I S0 1 92: 99 4(E ) - Tabl e Perm i ssi bl e d evi ati on s between speci fi ed an al ysi s (see tabl e 3) an d prod u ct I S0 an al ysi s , Perm i ssi bl e m axi m u m ten t accord i n g to cast Perm i ssi bl e an al ysi s d evi ati on l ) El em en t % (m/m) % < 0, 30 (m/m) f 082 f 03 C > 0, 30 Si an d < 49 < 0, 80 + 0, 05 Q l , oo f 904 f WI Mn > , 00 ) f m e an s tabl e , 0, 035 + 0, 005 S < 0, 060 f 0, 005 < th at, in n ot on e bo th o f steel cas t, at Tab l e th e th e d e vi ati o n s am e - m ay o ccu r o ve r 0, 20 th e Types of steel an d th e l o we r val u e of th e 0, 02 spe ci fi e d m ech an i cal properti es of bars fo r properti esl ) 2) I I N /m m 4) 4) % % M n VS TP 390 600 to 750 32 30 M n VS TP 450 70 to 850 30 38 M n VS TP 520 800 to 950 25 46 M n VS TP 580 20 46 M n VS TP 450 30 I S0 u ppe r 900 to 70 to 050 850 6892 yi el d te n si l e s tre s s o r, if no yi e l d ph e n o m e n o n p e rce n tag e val u es 3) Th e n am e s = o ccu rs , th e 0, % p ro o f s tre s s Rpo,p s tre n g th ; pe rce n tag e N /m m * ran g e m ach i n i n g 1 Th e u n d er N am e31 2) 4) or M ech an i cal e l o n g ati o n afte r fractu re on ori g i n al are a) ; Z: val u e I N /m m R,: R,: A: u ppe r d esi g n ati on N u m ber See f ti m e I ) , 60 < bu t Type d P V in an d re d u cti o n appl y are in fo r of si z e s are a up acco rd an ce M Pa to 20 wi th mm l S O/TR 49 49 g au g e l en g th & = 5, 65& ( wh e re S, , is th e o ri g i n al cro s s - s e cti o n al IS0 1 692:1 994(E) Table N OTE if th e - Ve ri fi cati o n re q u i re m e n t is of th e re q u i re m e n ts appl i cabl e acco rd i n g is on l y to No for the verification of the requirements in column Test conditions n e ce s s ary tabl e , co l u m n if i n spe cti o n I Requirements an Te s t unit te s t tab l e s an d re po rt is o rd e re d , of N u m ber te s ts Test method of per C In per s am p l e unit e ac h p ro d u ct c as e , m an u factu re r; th e fo r cas t an al ys i s p ro d u c t is pro vi d e d an al ys i s see by th e Acc o rd i n g A p ri ate to I S O /TR H ard n e s s in th e C+D+T 1 c o n d i ti o n In c as e th e “ tre ate d to im- of d i s pu te , h ard n e s s be m e as u re d , pro ve po s s i bl e, at s h e arab i l i ty ” c u m fe re n ce pro d u ct tan ce n e ss a x fro m an d , in p ro d u c ts a re ctan g u - x b, tab l e in C+D+T 1 th e th e of p re c i p i tati o n h ard e n e d to co n - be fi g u re te s t take n c o rd an c e d i ti o n on e ed g e p i e ce s te n s i l e is th e fro m te s t b wh e re wi d th Th e at of l o n g i tu d i n al M e ch an i cal en d of wi th or pro d u ct, p ro p e rti e s th i ck- on e d i s tan ce 25 c i r- th e c ro s s - s e ct i o n , th e to 6506 d i s- cas e s s q u are l ar of I S0 in if th e at of l i s te d 769 Acc o rd i n g s h al l ap p ro - I n te rn ati o n al S tan d ard s an d 2) p ro d u c ts co m - i n spe cti o n Samplingl) s am p l e p o s i ti o n an I N u m ber C h e m i c al or Amount of testing See ce rti fi cate in fo r Th e are te n s i l e s h al l ac- in wi th te s t ca rri e d a cco rd an ce I S0 be 6892 on p ro - p o rti o n al te s t h avi n g a g au g e l e n g th of L, = ou t wi th p i e ce s &- wh e re S, is th e s e cti o n al te s t ) 2) Th e Th e tre atm e n t g e n e ral te s ts c o n d i ti o n s s h al l b atch as be fo r s e l e c ti o n c a rri e d i n d i cate d ou t by an d s e parate l y p re parati o n fo r e ac h of te s t ca s t as s am p l e s i n d i c ate d an d by te s t “C ”, pi ece s e ach sh ou l d be d i m en si on in ac co rd an c e as i n d i c ate d wi th by I S0 I ’ D ”, c ro s s - are a of th e p i e ce 77-l an d e ach h e at- “ T” I S0 1 692: 994(E) Dimensions A = Sample product B = Test sample C = Test bar (the piece after treated) Cl = Test piece to the size in which it is to be heat Circular and similar shaped sections a > 25 baa a G 25” b3o a < 25” a I- reduction b b t- -I 2,s L-4 Rectangular sections including squares /‘ - / \ ,/ ) Tensile test piece I) For small products (u or b G 25 mm) the test piece shall, possible, consist of an unmachined part of the bar Fi g u re - Locati on of th e if test pi eces in bars in millimetres I S0 1 : 9 4( E ) Annex A ( n o rm ati ve ) Supplementary or special requirements A.1 General On e or spe ci al m o re by th e q u i ry of th e re q u i re m e n ts spe ci fi e d d e tai l s A.4 in of th e th ese en q u i ry be an d an d su ppl e m en tary appl i e d , o rd e r re q u i re m e n ts m an u factu re r an d fo l l o wi n g sh al l bu t on l y Wh e re sh al l pu rch aser be at n ece ssary, ag re e d th e or wh en ti m e Product analysis On e pro d u ct el e m e n ts an al ysi s of en - Th e o rd e r I S0 co n te n t l i m i ts wh i ch scopi cal l y ce d u re of n o n - m e tal l i c h ave be e n inclusion d e te rm i n e d ( fo r i n cl u si on s ag re e d acco rd i n g e xam pl e se e I S0 sh al l u pon , to be wh en an take n Th e m i cro - pro - S te e l pro d u cts an d ag re e d u pon sh al l be u l trason i cal l y acco rd i n g at th e ti m e to of an te s te d acce ptan ce en q u i ry an d u n d er co n - stan d ard , o rd e r type carri e d are ou t s pe ci fi e d pe r cas t fo r th e fo r cast co n ce rn e d fo r fro m in In sam pl i n g th e th e cas e ch e m i cal acco rd an ce on e of th e sh al l of be d i spu te in co m po s i ti o n wi th a acco rd an ce abo u t th e sh al l re fe re n ce I n tern ati o n al an a- be d e- m e th o d S tan d ard s l i ste d in 769 A.5 Special agreements for marking - Ultrasonic tests d i ti on s, be wi th i n Determination of content of non-metallic inclusions - Micrographic method using standard diagrams) A.3 sh al l val u es ste e l 77- te rm i n e d ag re e d 49 67: 79 , th e m e th o d , I S O /TR Th e wh i ch co n d i ti o n s wi th Content of non-metallic of an al ysi s u pon l yti cal A.2 fo r Th e pro d u cts ag re e d u pon sh al l at th e be ti m e m arke d of in en q u i ry a an d way speci al l y o rd e r I S0 Q IS0 1 692: 994(E) An n ex B (informative) Guide B.l to ad d i ti on al property International Standard They are not intended for use in the purchase or design For such purposes, the re- I n tro d u cti on quirements shall be agreed between the supplier and his customer Property values which are contained in this International Standard are requirements of delivery unless otherwise stated (see table1 and note to 5.2.2) Property values which are only indicated in this annex are not requirements of deliven/, because they are the result of processing after deliven/ The data in this annex are provided only as a guide to the relative performance Tabl e B.l of the different steels enumerated - G u i d an ce d ata for m ech an i cal val u es B.2 M ech an i cal properti es Table B.l contains information on mechanical proper- ties for “composition” hardening in this properti es of bi l l ets an d bars for h ot grades after precipitation forg i n g after preci pi tati on h ard en i n g M ech an i cal properti esl ) 2) designation RI -II R8 Type of steel N/mm2 3) N/mm2 3) A Z min % % MnVS 420 650 to 850 16 32 MnVS 470 730 to 930 14 30 12 25 20 10 20 30 38 MnVS 46 MnVS6 46 MnVS 520 800to 570 880 470 000 to 080 730 to 930 1) See B l 2) Re: upper yield stress or, if no yield phenomenon occurs, the 0,2 % proof stress Rp,,*; R,: tensile strength; A: percentage elongation after fracture on original gauge length L, = 5,65& Z: percentage reduction of area 3) N/mm* = MPa (where S, is the original cross-area); IS0 11692: 1994(E) ICS 77.140.10; 77.140.20 Descriptors: ch e m i c a l P ri c e steel s, al l o y c o m p o s i ti o n , b as e d on o aae s steel s, d e l i ve ry m e ta l co n d i ti o n , b ars , te s ts , b i l l e ts , i ro n i n s p e c ti o n , an d s te e l m arki n g p ro d u c ts , cl as s i fi cati o n , s p e c i fi ca ti o n s , m e ch an i cal p ro p e rti e s ,