Smithells Light Metals Handbook Part 6 pptx

70 Smithells Light Metals Handbook Table 4.1 (continued) Specification BS 1490: 1988 Related British Specifications LM18M(SP) LM25M(Ge) LM25TE(Ge) LM25TB7(Ge) LM25TF(Ge) LM29TE(SP) LM29TF(SP) Composition % (Single figure indicates maximum)      Copper 0.1 0.20 0.8 1.3 Magnesium 0.1 0.20 0.60 0.8 1.3 Silicon 4.5 6.0 6.5 7.0 22 25 Iron 0.6 0.5 0.7 Manganese 0.5 0.3 0.6 Nickel 0.1 0.1 0.8 1.3 Zinc 0.1 0.1 0.2 Lead 0.1 0.1 0.1 Tin 0.05 0.05 0.1 Titanium 0.2 0.2 † 0.2 Other Cr 0.6; Co 0.5, P § Properties of material Suitability for: Sand casting G G P Chill casting (gravity die) G E F Die casting (press die) G Ł G Ł U Strength at elevated temperature P G ‡ G Corrosion resistance E E G Pressure tightness E G F Fluidity G G F Resistance to hot shortness E G E Machinability F F P Melting range, C 565 625 550 615 520 770 Casting temperature range, C 700 740 680 740 At least 830 Specific gravity 2.69 2.68 2.65 Aluminium and magnesium casting alloys 71 Heat treatment Solution temperature, ° C 525 545 525 545 495 505 Solution time, h 4 12 4 12 4 Quench Water, 70 80 ° C Water, 70 80 ° C Air blast Precipitation temperature, ° C 155 175 155 175 185 185 Precipitation time, h 8 12 8 12 To produce HB 8 requirement Stabilization temperature, ° C 250 Stabilization time, h 2 4 Special properties Readily welded General purpose high-strength casting alloy More suited to chill (grav, die) casting Piston alloy Mechanical properties sand cast SI units (Imperial units in brackets) Tensile stress min., MPa (tonf in 2 ) 120(7.8) 130(8.4) 150(9.7) 160(10.4) 230(149) 120(7.8) 120(7.8) Elongation min. % 3 2 1 2.5 0 2 0.3 0.3 Expected 0.2% proof stress, 55 60(3.6 3.9) 80 100(5.2 6.5) 120 150 (7.8 9.7) 80 110 (5.2 6.5) 200 250 (12.9 16.2) 120(7.8) 120(7.8) MPa (tonf in 2 ) HB 100 140 HB 100 140 Mechanical properties chill cast SI units (Imperial units in brackets) Tensile stress min., MPa (tonf in 2 ) 140(9.1) 160(10.4) 190(12.3) 230(14.9) 280(18.1) 190(12.3) 190(12.3) Elongation min. % 4 3 2 5 2 0.3 0.3 Expected 0.2% proof stress, 60 70(3.9 4.5) 80 100(5.2 6.5) 130- 200(8.4 12.9) 90 110(5.8 7.1) 220 260 (14.2 16.8) 170(11.0) 170 190 (11.0 12.3) MPa (tonf in 2 ) HB 100 140 HB 100 140 Ł Not normally used in this form. Note † If Ti alone is used for grain refinement then Ti 6< 0.05%. E Excellent. F Fair. G Good. P Poor. U Unsuitable. ‡ Fully heat-treated. (Ge General purpose alloy; SP Special purpose alloy as per BS: 1490: 1988). § Refine with phosphorus-subject to examination under microscope. ŁŁ Or for such time to give required BHN. 72 Smithells Light Metals Handbook Table 4.2 ALUMINIUM-SILICON-COPPER ALLOYS LM16TF Specification BS 1490; 1988 LM4MTF LM16TB (SP) Related British Specifications LM2M(Ge) LM4M(Ge) (Ge) (SP) 3L78 LM21M(SP) Composition % (Singlefigures indicate maximum)      Copper 0.7 2.5 2.0 4.0 1.0 1.5 3.0 5.0 Magnesium 0.30 0.15 0.4 0.6 0.1 0.3 Silicon 9.0 11.5 4.0 6.0 4.5 5.5 5.0 7.0 Iron 1.0 0.8 0.6 1.0 Manganese 0.5 0.2 0.6 0.5 0.2 0.6 Nickel 0.5 0.3 0.25 0.3 Zinc 2.0 0.5 0.1 2.0 Lead 0.3 0.1 0.1 0.2 Tin 0.2 0.1 0.05 0.1 Titanium 0.2 0.2 0.2 Ł 0.2 Properties of material Suitability for: Sand casting G † GGG Chill casting (gravity die) G † GGG Die casting (press die) E G F † G † Strength at elevated temp. G ‡ GGG Corrosion resistance G G G G Pressure tightness G G G G Fluidity G G G G Resistance to hot shortness E G G G Machinability F G G G Melting range, ° C 525 570 525 625 550 620 520 615 Casting temperature range, ° C 700 760 690 760 680 760 Specific gravity 2.74 2.73 2.70 2.81 Heat treatment Solution temperature, ° C 505 520 520 530 520 530 Solution time, h 6 16 12 (min) 12 (min) Quench Water at Water at Water at 70 80 ° C7080 ° C70 80 ° C Precipitation temperature, ° C 150 170 160 170 Precipitation time, h 6 18 8 10 Special properties Alloy for General engineering alloy Pressure tight. High Equally pressure Can tolerate relatively strength alloy in TF suited to all die castings high static loading in condition casting TF condition processes Mechanical properties sand cast SI units (Imperial units in brackets) Tensile stress min. MPa (tonf in 2 ) 140(9.1) 230(14.9) 170(11.0) 230(14.9) 150(9.7) Elongation min. % 2 2 1 Expected 0.2% proof stress, MPa (tonf in 2 ) 70 110 200 250 120 140 220 280 80 140 (4.5 7.1) (12.9 16.2) (7.8 9.1) (14.2 18.1) (5.2 9.1) Mechanical properties chill cast SI units (Imperial units in brackets) Tensile strength min. MPa (tonf in 2 ) 150(9.7) 160(10.4) 280(18.1) 230(14.9) 280(18.1) 170(11.0) Elongation min. % 1 2 1 3 1 Expected 0.2% proof stress, MPa (tonf in 2 )90130 80 110 200 300 140 150 250 300 80 140 (5.8 8.4) (5.2 7.1) (12.9 19.4) (9.1 9.7) (16.2 19.4) (5.2 9.1) Ł 0.05% min. if Ti alone used for grain refinement. † Not normally used in this form. ‡ The use of die castings is usually restricted to only moderately elevated temperatures. Aluminium and magnesium casting alloys 73 Table 4.2 (continued) Specification BS 1490: 1988 LM22TB LM24M LM26TE LM27M LM30M LM30TS Related British Specifications (SP) (Ge) (SP) (Ge) (SP) (SP) Composition % (Single figures indicate maximum)    Copper 2.8 3.8 3.0 4.0 2.0 4.0 1.5 2.5 4.0 5.0 Magnesium 0.05 0.1 0.5 1.5 0.3 0.4 0.7 Silicon 4.0 6.0 7.5 9.5 8.5 10.5 6.0 8.0 16 18 Iron 0.6 1.3 1.2 0.8 1.1 Manganese 0.2 0.6 0.5 0.5 0.2 0.6 0.3 Nickel 0.15 0.5 1.0 0.3 0.1 Zinc 0.15 3.0 1.0 1.0 0.2 Lead 0.1 0.3 0.2 0.2 0.1 Tin 0.05 0.2 0.1 0.1 0.1 Titanium 0.2 0.2 0.2 0.2 0.2 Properties of material Suitability for: Sand casting G † F † GG U Chill casting (gravity die) G F † GE F Die casting (press die) G † EF † G † G Strength at elevated temp. G G ‡ EG G Corrosion resistance G G G G G Pressure tightness G G F G F Fluidity G G G G G Resistance to hot shortness G G F G F Machinability G F F G P Melting range, ° C 525 625 520 580 520 580 525 605 505 650 Casting temperature range, ° C 700 740 670 740 680 740 Well above 650 ° C Specific gravity 2.77 2.79 2.76 2.75 2.73 Heat treatment Solution temperature, ° C 515 530 Solution time, h 6 9 Quench Water at 70 80 ° C Stress relief Precipitation temperature, ° C 200 210 175 225 Precipitation time, h 7 9 8(minimum) Special properties Chill casting Alloy for Piston alloy, Excellent Alloy for pressure die alloy (grav. pressure retains castability casting automobile engine die) die castings strength cylinder blocks and hardness at elevated temps. Mechanical properties sand cast SI units (Imperialunits in brackets) Tensile stress min., MPa (tonf in 2 ) 140(9.1) Elongation min. % 1 Expected 0.2% proof stress, MPa (tonf in 2 ) 80 90 (5.2 5.8) Mechanical properties chill cast SI units (Imperialunits in brackets) HB D 90 120 Tensile strength min., MPa (tonf in 2 ) 245(15.9) 180(11.7) 210(13.6) 160(10.4) 150(9.7) 160(10.4) Elongation min. % 8 1.5 1 2 0.5 0.5 Expected 0.2% proof stress, MPa (tonf in 2 ) 110 120 100 120 160 190 90 110 150 200 160 200 (7.1 7.8) (6.7 7.7) (10.4 12.3) (5.8 7.1) (9.7 12.9) (10.4 12.9) Note: E Excellent. F Fair. G Good. P Poor. U Unsuitable. (Ge General purpose alloy; Sp-Special purpose alloy as per BS 1490;1988). 74 Smithells Light Metals Handbook Table 4.3 ALUMINIUM-COPPER ALLOYS Specification BS 1490; 1988 LM12M(SP) LM12TF(SP) Ł [LM14-WP] † [LM11-W] [LM11-WP] Aerospace BSL series 4L35 2L91 2L92 DTD series 361B 741A     Composition % (Single figures indicate maximum) Copper 9.0 11.0 3.5 4.5 4.0 5.0 4.0 5.0 3.5 4.5 Magnesium 0.2 0.4 1.2 1.7 0.10 0.10 1.2 2.5 Silicon 2.5 0.6 ‡ 0.25 0.25 0.5 Iron 1.0 0.6 ‡ 0.25 0.25 0.5 Manganese 0.6 0.6 0.10 0.10 0.1 Nickel 0.5 1.8 2.3 0.10 0.10 0.1 Zinc 0.8 0.1 0.10 0.10 0.1 Lead 0.1 0.05 0.05 0.05 0.1 Tin 0.1 0.05 0.05 0.05 0.05 Titanium 0.2 0.25 0.25 Ti C Nb 0.05 0.30 Other Co 0.5 1.0 Nb 0.05 0.3 Properties of material Suitability for: Sand casting F F F F F Chill casting (gravity die) G G P P G Die casting (press die) U U U U Strength at elevated temperature G E F Corrosion resistance P F F F F Pressure tightness G E P P F Fluidity F G F F G Resistance to hot shortness G G P P G Machinability E G G G G Melting range, C 525 625 530 640 545 640 540 650 530 640 Casting temperature range, C 700 760 700 750 680 700 675 750 710 725 Specific gravity 2.94 2.82 2.80 2.80 2.80 Aluminium and magnesium casting alloys 75 Heat treatment Solution temp., ° C 515 520 500 520 525 545 525 545 525 545 495 505 Solution time, h 661216 12 16 16 (minimum) 10 (minimum) †† Quench Water at 70 80 ° C Boiling water Water at 70 80 ° C Water at 70 80 ° C Water or oil Oil at 80 90 ° C Precipitation temperature, ° C 175 180 95 103 § 120 140 120 170 160 70 195 205 Precipitation time, h 2 (minimum) 2 ŁŁ 1 21214 8 16 4 5 Special properties Piston alloy, now superseded by Excellent props. Good shock High strength LM13 and LM26. Excellent at elevated resistance alloy machinability temperatures Grav. die alloy Mechanical properties sand cast SI (Imperial units in brackets) Tensile stress min., MPa (tonf in 2 ) 220(14.2) 220(14.2) 280(18.1) 324(21.0) 263(17.0) Elongation % 74 Expected 0.2% proof stress, min., MPa 210 240 165 200 200 240 310(20.1) 250(16.2) (tonf in 2 ) (13.6 15.5) (10.7 12.9) (12.9 15.5) Mechanical properties chill cast SI units (Imperial units in brackets) Tensile stress min., MPa (tonf in 2 ) 170 278(18.0) 280(18.1) 265(17.1) 310(20.1) 402(26.0) 340(22.0) Elongation % 13 9 4 Expected 0.2% proof stress, min., MPa 140 170 139 170 230 260 165 200 200 240 360(23.3) 260(16.8) (tonf in 2 ) (9.0 11.0) (14.9 16.8) (10.7 12.9) (12.5 15.5) HB 100 150 HB 100 130 Ł Not included in BS 1490: 1988. Note: † [ ] signifies obsolete specification. E Excellent. F Fair. G Good. P Poor. U Unsuitable. ‡ Si C Fe 1.0 max. (Ge General purpose alloy; SP Special purpose alloy as per BS 1490: 1988). § Or 5 days ageing at room temp. ŁŁ Can substitute stabilizing treatment at 200 250 ° C if used for pistons. †† Allow to cool to 480 ° C before quench. 76 Smithells Light Metals Handbook Table 4.4 MISCELLANEOUS ALUMINIUM ALLOYS Specification BS 1400; 1988 LM5M(SP) LM10TB(SP) Aerospace BSL series 4L53 L99 DTD series 5018A Composition % (Single figures indicate maximum) Copper 0.1 0.2 0.1 0.1 Magnesium 3.0 6.0 7.4 7.9 9.5 11.0 0.20 0.45 Silicon 0.3 0.25 0.25 6.5 7.5 Iron 0.6 0.35 0.35 0.20 Manganese 0.3 0.7 0.1 0.3 0.10 0.10 Nickel 0.1 0.1 0.10 0.10 Zinc 0.1 0.9 1.4 0.10 0.10 Lead 0.05 0.05 0.05 0.05 Tin 0.1 0.05 0.05 0.05 Titanium 0.2 0.25 0.2 † 0.20 Other Properties of material Suitability for: Sand casting F F F G Chill casting (gravity die) F F F E Die casting (press die) F ‡ F ‡ F ‡ Strength at elevated temp. F F F Corrosion resistance E E E E Pressure tightness P P P G Fluidity F F F G Resistance to hot shortness F G G G Machinability G G G F Melting range, ° C 580 642 450 620 550 615 Casting temperature range, ° C 680 740 680 720 680 720 680 740 Specific gravity 2.65 2.64 2.57 2.67 Heat treatment Solution temperature, ° C 425 435 § 425 435 535 545 Solution time, h 8812 Quench Oil at 160 ° C ŁŁ Oil at no more †† Water at 65 ° C min or boiling water than 160 ° C Precipitation temp., ° C 150 160 Precipitation time, h 4 Special properties Good corrosion Good shock Excellent resistance resistance and castability with in marine high corrosion good mech. atmospheres resistance *** props. Mechanical properties Sand cast SI units (Imperial units in brackets) Tensile stress min, MPa (tonf in 2 ) 140(9.1) 278 280(18.0) 230(14.9) Elongation % 3 3 8 2 Expected 0.2% proof stress, min MPa (tonf in 2 )90110(5.8 7.1) 170(11.0) 170 190 185(12.0) (11.0-12.3) Mechanical properties chill cast SI units (Imperial units in brackets) Tensile stress min, MPa (tonf in 2 ) 170(11.0) 309(20.0) 310(20.1) 280(18.1) Elongation % 5 10 12 5 Expected 0.2% proof stress, 90 120(5.8 7.8) 170(11.0) 170 200 200(12.9) min MPa (tonf in 2 ) (11.0 12.9) Ł [ ] obsolete. † 0.05% min. if Ti alone used for grain refinement. †† Not normally used in this form. § Or8hat435 445 C then raise to 490 500 C for further 8 h and quench as in table. ŁŁ Do not retain castings in oil for more than 1 h. ŁŁŁ Not generally recommended since occasional brittleness can develop over long periods. Aluminium and magnesium casting alloys 77 Table 4.4 (continued) Specification BS 1400: 1988 LM28TE(SP) LM28TF(SP) [LM23P] Ł [LM15WP] Ł Aerospace BSL series 3L51 3L52 DTD series 5008B Composition % (Single figures indicate maximum) Copper 1.3 1.8 0.8 2.0 1.3 3.0 0.1 Magnesium 0.8 1.5 0.05 0.2 0.5 1.7 0.5 0.75 Silicon 17 20 1.5 2.8 0.6 2.0 0.25 Iron 0.7 0.8 1.4 0.8 1.4 0.5 Manganese 0.6 0.1 0.1 0.1 Nickel 0.8 1.5 0.8 1.7 0.5 2.0 0.1 Zinc 0.2 0.1 0.1 4.8 5.7 Lead 0.1 0.05 0.05 0.1 Tin 0.1 0.05 0.05 0.05 Titanium 0.2 0.25 0.25 0.15 0.25 Other Cr 0.6 Co 0.5 Cr 0.4 0.6 Properties of material Suitability for: Sand casting P G F F Chill casting (gravity die) F G G P Die casting (press die) G ‡ UU ‡ Strength at elevated temp. F G E F Corrosion resistance G G G E Pressure tightness F G F F Fluidity F F F F Resistance to hot shortness G G G P Machinability P G G G Melting range, ° C 520 675 545 635 600 645 572 615 Casting temp. range, ° C 6<735 680 750 685 755 730 770 Specific gravity 2.68 2.77 2.75 2.81 Heat treatment Solution temperature, ° C 495 505 520 540 Solution time, h 4 4 Quench Air blast Water at 80 100 ° C Oil or air blast Precipitation temp, ° C 185 185 150 175 150 180 175 185 ‡‡ (195 205) (at least 24 h after cast) Precipitation time, h To produce 8 8 24 8 24(2 5) 10(at least 24 h required HB after cast) Special properties Piston alloy Aircraft engine High mechanical Good strength castings props. at without heat elevated temps. treatment. See ‡‡ Mechanical properties sand cast SI units (Imperial units in brackets) Tensile stress min, MPa (tonf in 2 ) 120(7.8) 160(10.4) 280(18.1) 216(14.0) Elongation % 2 4 Expected 0.2% proof stress, min MPa (tonf in 2 ) 125(8.1) 245(15.9) 150(9.7) HB100 140 Mechanical properties chill cast SI units (Imperial units in brackets) Tensile stress min, MPa (tonf in 2 ) 170(11.0) 190(12.3) 200(13.0) 325(21.0) 232(15.0) Elongation % 3 5 Expected 0.2% proof stress min, MPa (tonf in 2 ) 160 190 140(19.1) 295(19.1) 180(11.7) HB 90 130 (10.4 12.3) HB 100 140 †† Can be furnace cooled to 385 395 ° C before quench. Do not retain in oil for more than 1 h. Further quench in water or air. ‡‡ Alternative-room temp. age-harden for 3 weeks. Note: E Excellent. F Fair. G Good. P Poor. U Unsuitable. (Ge General purpose alloy; SP Special purpose alloy as per BS 1490: 1988). 78 Smithells Light Metals Handbook Table 4.5 HIGH STRENGTH CAST AL ALLOYS BASED ON AL-4.5 CU European KO1 A-U5GT Designation Al Assoc (USA) designation 201.0 201.2 A201.0 A201.2 204.0 204.2 206.0 206.2 A206.0 A206.2 Cu 4.0 5.2 4.0 5.2 4.0 5.0 4.0 5.0 4.2 5.0 4.2 4.9 4.2 5.0 4.2 5.0 4.2 5.0 4.2 5.0 Mg 0.15 0.55 0.20 0.55 0.15 0.35 0.20 0.35 0.15 0.35 0.20 0.35 0.15 0.35 0.20 0.35 0.15 0.35 0.20 0.35 Si 0.10 0.10 0.05 0.05 0.20 0.15 0.10 0.10 0.05 0.05 Fe 0.15 0.10 0.10 0.07 0.35 0.10 0.20 0.15 0.10 0.10 0.07 Mn 0.20 0.50 0.20 0.50 0.20 0.40 0.20 0.40 0.10 0.05 0.20 0.50 0.20 0.50 0.20 0.50 0.20 0.50 Ni 0.05 0.03 0.05 0.03 0.05 0.03 Zn 0.10 0.05 0.10 0.05 0.10 0.05 Sn 0.05 0.05 0.05 0.05 0.05 0.05 Ti 0.15 0.35 0.15 0.35 0.15 0.35 0.15 0.35 0.15 0.30 0.15 0.25 0.15 0.3 0.15 0.25 0.15 0.30 0.15 0.25 Ag 0.40 1.0 0.40 1.0 0.40 1.0 0.40 1.0 Others each 0.05 0.05 0.03 0.03 0.05 0.05 0.05 0.05 0.05 0.05 Others total 0.10 0.10 0.10 0.10 0.15 0.15 0.15 0.15 0.15 0.15 Aluminium and magnesium casting alloys 79 Table 4.6 MINIMUM REQUIREMENTS FOR SEPARATELY CAST TEST BARS EI% Typical UTS 0.2 PS in 50 mm HB Alloy Sand/Die Treatment Ł MPa MPa or 4 ð diam 500 kgf 10 mm 201.0 Sand T6 414 345 5.0 110 140 Sand T7 414 345 3.0 130 204.0 Sand T4 311 194 6.0 95 Die T4 331 220 8.0 Ł For temper designations see Table 7.3. Table 4.7 TYPICAL PROPERTIES OF SEPARATELY CAST TEST BARS EI% Typical UTS 0.2 PS in 50 mm HB Alloy Sand/Die Treatment Ł MPa MPa or 4 ð diam 500 kgf 10 mm 201.0 Sand T4 365 215 20 95 T43 414 255 17 Sand T6 448 485 380 435 7 8 135 Sand T7 Room Temp. 460 469 415 4.5 5.5 130 T7 150C Ł 0.5 100 h 380 360 6 8.5 1 000 h 360 345 8 10 000 h 315 275 7 205C 0.5 h 325 310 9 100 h 285 270 10 1 000 h 250 230 9 10 000 h 185 150 14 260C 0.5 h 195 185 14 100 h 150 140 17 1 000 h 125 110 18 315C 0.5 h 140 130 12 100 h 85 75 30 1 000 h 70 60 39 10 000 h 60 55 43 A206.0 Sand T4 118HV T7 20C 436 347 11.7 137HV 120C 384 316 14.0 175C 333 302 17.7 Ł Elevated temperature properties. [...]... 3 Liquids, ° C Solidus, ° C Non-equilibrium solidus, ° C Casting temperature range, ° C A8 (High purity) AZ81 69 0A 7.5 9.0 0.3 1.0 0.15 0.7 0.005 0.01 0.003 0.001 Good Special melting technique required Little Appreciable A Good C C Moderate 1.81 60 0 475 420 68 0 800 Smithells Light Metals Handbook 4.2 Heat treatment Solution: Time, h Temperature, ° C Cooling 12 (min) 435 (max)‡‡ Air, oil or water Elektron... 16 (min) 435 (max)‡‡ Air, oil or water Sand and permanent mould Good Little Less than MAG1 A Good C C Excellent 1.83 595 470 420 68 0 800 8.5 9.5 0.45 0.9 0.15 0.40 0.015 0.020 0.005 0.0010 High pressure die Good Little Little A Difficult C C Excellent 1.83 595 470 420 62 0 68 0 5.5 6. 5 0.25 0.75 2.4 3.0 0.20 0.05 0.01 Sand, permanent and high pressure die Good Little Little B Good C B Moderate 1.84 63 5... 5.5 6. 5 0.25 0.75 2.4 3.0 0.20 0.05 0.01 Sand, permanent and high pressure die Good Little Little B Good C B Moderate 1.84 63 5 465 700 810 Smithells Light Metals Handbook Heat treatment Solution: Time, h Temperature, ° C Cooling Heat treatment Time, h Temperature, ° C Cooling 16 (min) 435 (max) Air, oil or water Elektron designation ASTM designation Specifications BS 2970: 1989 BSS L series Equivalent... (tonf in 2 †† 125 (8.1) 200 (13.0) 95 (6. 2) 85 (5.5) 0.2% proof stress (min), MPa (tonf in 2 ) p Elongation % (min) (5 .65 S0 ) 4 Mechanical properties chill cast (SI units first, Imperial units following in brackets) Tensile strength (min), MPa (tonf in 2 ) 170 (11.0) 215 (13.9) 0.2% proof stress (min), MPa (tonf in 2 ) 100 (6. 5) 85 (5.5) p Elongation % (min) (5 .66 S0 ) 2 5 Applications C alloy 200 (13.0)... purity) AZ81 2 4 250 330 MAG2M(SP)† MAG2TB(SP) 68 4A MAG1TBŁ (GP) 3L.122 69 0A 2 4 250 330 140 (9.1) 85 (5.5) 2 200 (13.0) 80 (5.2) 6 Mechanical properties chill cast (SI units first, Imperial units following in brackets) 185 (12.0) 230 (14.9) Tensile strength (min), MPa (tonf in 2 ) 0.2% proof stress (min), MPa (tonf in 2 ) 85 (5.5) 80 (5.2) p Elongation % (min) (5 .65 S0 ) 4 10 185 (12.0) 85 (5.5) 4 230 (14.9)... (8.4) 2 170 (11.0) 85 (5.5) 2 215 (13.9) 80 (5.2) 5 215 (13.9) 110 (7.1) 2 For pressure tight applications Increased proof stress after full heat treatment Principal alloy for commercial usage Smithells Light Metals Handbook Table 4.8 (continued ) ... micro-porosity Castability§ Weldability (Ar-Arc process) 12 (min) 435 (max)‡‡ Air, oil or water 82 Table 4.8 (continued ) 16 (min) 435 (max)‡‡ Air, oil or water Elektron designation ASTM designation AZ91 (HP) AZ91E Specifications BS 2970: 1989 BSS L series Equivalent DTD ZC63 ZC63 AZ91D MAG11 (GP) Composition % (Single figures indicate maximum) Aluminium Zinc Manganese Copper Silicon Iron Nickel Cu C... ASTM designation Specifications BS 2970: 1989 BSS L series Equivalent DTD A8 AZ81 MAG1MŁ (GP)† Good Sand and permanent‡ mould Little Appreciable A Good C C Moderate 1.81 60 0 475 420 68 0 800 MAG1TBŁ (GP) 3L 112 MAG2M(SP)† MAG2TB(SP) 68 4A Composition % (Single figures indicate maximum) Aluminium 7.5 9.0 Zinc 0.3 1.0 Manganese 0.15 0.4 Copper 0.15 Silicon 0.3 Iron 0.05 Nickel 0.01 CuCSiCFeC4Ni 0.40 Material... permanent mould and die (pressure) Little Less than MAG1 A Good, but some difficulty with die castings C C Moderate 1.83 595 470 420 68 0 800 Good Sand, permanent mould and die (pressure) Little Less than MAG1 A Good, but some difficulty with die castings C C Moderate 1.82 60 0 475 420 68 0 800 81 continued overleaf Aluminium and magnesium casting alloys Composition % (Single figures indicate maximum) Aluminium... units first, Imperial units following in brackets) Tensile strength (min), MPa (tonf in 2 ) 140 (9.1) 200 (13.0) 0.2% proof stress (min), MPa (tonf in 2 ) 85 (5.5) 80 (5.2) p Elongation % (min) (5 .65 S0 ) 2 6 83 84 Elektron designation ASTM designation Specifications BS 2970: 1989 BSS L series Equivalent DTD Precipitation: Time, h Temperature, ° C Stress relief: Time, h Temperature, ° C AZ91 MAG3M(GP) . G Machinability G G G F Melting range, ° C 580 64 2 450 62 0 550 61 5 Casting temperature range, ° C 68 0 740 68 0 720 68 0 720 68 0 740 Specific gravity 2 .65 2 .64 2.57 2 .67 Heat treatment Solution temperature, ° C. P Machinability P G G G Melting range, ° C 520 67 5 545 63 5 60 0 64 5 572 61 5 Casting temp. range, ° C 6& lt;735 68 0 750 68 5 755 730 770 Specific gravity 2 .68 2.77 2.75 2.81 Heat treatment Solution temperature, ° C. 265 (17.1) 310(20.1) 402( 26. 0) 340(22.0) Elongation % 13 9 4 Expected 0.2% proof stress, min., MPa 140 170 139 170 230 260 165 200 200 240 360 (23.3) 260 ( 16. 8) (tonf in 2 ) (9.0 11.0) (14.9 16. 8)