An age-hardenable austenitic iron-nickel base superalloy. Its strength comes from \u03b3\u2032 Ni3(Al,Ti) precipitates formed by titanium and aluminium, not from carbides; carbon is therefore held below 0.08% and titanium is specified at 1.90-2.35%.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 Flat bar \u00b7 Plate \u00b7 Sheet \u00b7 Tube \u00b7 Forging<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 5525<\/b> (sheet, strip, plate; 1800 \u00b0F \/ 982 \u00b0C solution heat treated) \u00b7 AMS 5731<\/b> (bars, wire, forgings, mechanical tubing, rings, stock for forgings, rings or heading; consumable electrode remelted, 1800 \u00b0F \/ 982 \u00b0C solution heat treated, precipitation hardenable \u2014 NOT AGED) \u00b7 AMS 5732<\/b> (bars, wire, forgings, tubing, rings; consumable electrode melted, 1800 \u00b0F \/ 982 \u00b0C solution AND precipitation heat treated \u2014 AGED) \u00b7 AMS 5734<\/b> (bars, wire, forgings, tubing; consumable electrode melted, 1650 \u00b0F \/ 899 \u00b0C solution heat treated \u2014 NOT AGED) \u00b7 AMS 5737<\/b> (bars, wire, forgings, mechanical tubing, stock for forging and heading; consumable electrode remelted, 1650 \u00b0F \/ 899 \u00b0C solution AND precipitation heat treated \u2014 AGED) \u00b7 AMS 5726<\/b> (bars and wire; 1800 \u00b0F \/ 982 \u00b0C solution heat treated and work-strengthened, 200 ksi \/ 1379 MPa tensile strength capability) \u00b7 AMS 5853<\/b> (bars; 1800 \u00b0F \/ 982 \u00b0C solution treated and work-strengthened, 160 ksi \/ 1105 MPa tensile strength) \u00b7 AMS 5858<\/b> (sheet, strip, plate; multiple melted, 1800 \u00b0F \/ 982 \u00b0C solution heat treated, WELDING GRADE, precipitation hardenable) \u00b7 AMS 5895<\/b> (bars, wire, forgings, mechanical tubing, rings and forging stock; consumable electrode melted, 1750 \u00b0F \/ 954 \u00b0C solution heat treated, WELDING GRADE, precipitation hardenable) \u00b7 AMS 5804<\/b> and AMS 5805<\/b> (welding wire; AMS 5805<\/b> vacuum induction melted, environment controlled packaging) \u00b7 ASTM A453 \/ ASME SA-453 Grade 660, Class A \u00b7 B \u00b7 C \u00b7 D (high-temperature bolting) \u00b7 ASTM A638 \/ ASME SA-638 Grade 660, Type 1 and Type 2 (bars, forgings, forging stock) \u00b7 EN 10269 X6NiCrTiMoVB25-15-2 (1.4980)
IN THIS ALLOY THE AMS NUMBERS ARE SEPARATED FIRST BY SOLUTION TREATMENT TEMPERATURE AND AGEING STATE, NOT BY PRODUCT FORM. There are two distinct solution treatment recipes and the specification numbers follow that split.<\/span><\/div>\n<\/div>\n\n
Advantage<\/div>\n
In one number: in the same alloy, lowering the solution treatment temperature from 982 \u00b0C to 899 \u00b0C, with the same ageing cycle, raises the specification minimum from 896 MPa \/ 586 MPa (AMS 5732: 130 ksi tensile \/ 85 ksi yield) to 965 MPa \/ 655 MPa (AMS 5737: 140 ksi tensile \/ 95 ksi yield) \u2014 +69\u2026<\/div>\n<\/div>\n
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Welding<\/div>\n
Filler metal: matching A-286 welding wire \u2014
AMS 5804<\/b> or AMS 5805<\/b> (AMS 5805<\/b> is vacuum induction melted with environment controlled packaging). Process: inert gas shielded arc processes (TIG\/GTAW and MIG\/GMAW) are preferred; spot, resistance seam, flash butt and electron beam welding are also used.<\/div>\n<\/div>\n\n
Limits<\/div>\n
Service ceiling: strength and corrosion resistance hold to about 704 \u00b0C (1300 \u00b0F). Oxidation resistance continues to 816-982 \u00b0C, but no load-bearing strength remains at those temperatures \u2014 mistaking the oxidation limit for the service limit is the most common error with this alloy.<\/div>\n<\/div>\n