Stainless Steel

A 286 Alloys

Specs: AMS 5732, AMS 5737, ASTM-A-453 GRADE 660 CLASS A, ASTM-A-638 GRADE 660 TYPE 1, ASTM-A-453 GRADE 660 CLASS B, ASTM-A-638 GRADE 660 TYPE 2
UNS# K66286

Alloy A286 features high strength, oxidation resistance, and corrosion resistance at continuously high temperatures. A286 alloys are heat treatable to achieve a wide variety of grain structures and tensile properties. This grade of A286 is annealed and aged. Applications for Alloy A286 include jet engine components, superchargers, turbine wheels and blades, fasteners, springs, and general high-stress components in petrochemical, aerospace, and oil patch industries.

Details

A286 is an iron-nickel-chromium alloy with additions of molybdenum and titanium. A286 is one of the most popular high-temperature alloys. As one of the austenitic alloys, it maintains good strength and oxidation resistance at temperatures up to 1300ºF (700ºC).

It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. A286 has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulphuric, phosphoric, and nitric acids. Used for tanks, piping, heat exchangers, pumps, valves, and other process equipment.

Due to its high strength and excellent fabrication characteristics, A286 is used in various components of aircraft and industrial gas turbines. The alloy is also widely used in the offshore oil and gas industry where the components are subject to high levels of heat and stress.

Cold forming can also be conducted in the solution heat-treated condition to aid the properties after age hardening.

A286 bar can be solution treated at the temperatures detailed below, rapid cooled and then age hardened at 1325ºF (720ºC) for 16 hours and air cooling. The 1800ºF (980ºC) solution treatment produces the highest creep-rupture strength in age-hardened material whereas the 1650ºF (900ºC) treatment results in improved ductility and room temperature strength.

5737 is Solution Heat treated (annealed) at 1650 deg F +/- 25 degrees, then precipitation Heat treated (aged) between 1300-1400 degrees F for at least 16 hours, then air-cooled, achieve a min tensile of 140 KSI, min yield of 95 KSI, Min elongation of 12% and a min Reduction of area of 15%.

5732 is Solution Heat treated (annealed) at 1800 deg F +/- 25 degrees, then precipitation Heat treated (aged) between 1300-1400 degrees F for at least 16 hours, then air-cooled to achieve a min tensile of 130 KSI, min yield of 85 KSI, Min elongation of 15% and a min Reduction of area of 20%.

Available shapes – round

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Applications

Jet Engine Components
Super Chargers
Turbine Wheels
Gas turbine, disks, blades, and shafts
Compressors
After burner parts
High temperature fasteners and springs
Non-magnetic cryogenic equipment down to -423º F
Manifold Components in the oil and gas industry
Heat exchange, tanks, pumps, piping, valves

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Specifications

Specifications of A286

International Standards	Material Designation	Tube & Pipe Seamless	Sheet, Strip & Plate	Rod & Bar	Wire	Forgings
USA ASTM	UNS S66286 UNS K66286			ASTM A 453 Grade 660 Class A and B ASTM 1 638 Grade 660 Type 1 and 2
ASME				ASME SA-638
SAE				SAE J467-A286
AMS		AMS 5731 AMS 5732 AMS 5734 AMS 5737 AMS 5895	AMS 5525 AMS 5858	AMS 5726 AMS 5731 AMS 5732 AMS 5734 AMS 5735 AMS 5736 AMS 5737 AMS 5853 AMS 5895	AMS 5726 AMS 5731 AMS 5732 AMS 5734 AMS 5737 AMS 5805 AMS 5853 AMS 5895	AMS 5731 AMS 5732 AMS 5734 AMS 5737 AMS 5895
Custom			GEB50T1181 GEB50T12 GEB50T81	GEB50T1181 GEB50T12 GEB50T81		GEB50T12 GEB50T81
Europe AECMA ASD-STAN			AECMA Pr EN 2175 AECMA Pr EN 2417	AECMA Pr EN 2171 AECMA Pr EN 2119 AECMA Pr EN 2173		AECMA Pr EN 2172 AECMA Pr EN 2399
UK British Standard				BS HR 51 BS HR 52 BS HR 560 DTD 5076
France AFNOR				EZ 6NCT25-15

Mechanical Properties

Mechanical Properties of A286

Tests on 7/8″(22.2mm) diameter bar stock solution treated to 1800°F (982°C), 1 hour, oil quenched and aged at 1325°F (719°C), for 16 hours and then air-cooled.

Temp °F ºc	Ultimate Tensile Strength Ksi N/mm²	0.2% Yield Strength Ksi N/mm²	Elong in 2″ %	Reduction of Area %	Charpy V-notch ft-lb joules
70 21	145 1000	95 655	24	43	64 86.8
400 204	143 986	93.5 645	21	53	59 80
800 427	138 951	93 641	18	35	51 69
1000 538	131 903	87 603	18	31	45 33
1200 649	103.5 714	88 607	13	14	35 47.5
1400 760	64 441	62 427	18	23	52 70.5

Physical Properties

Physical Properties of Aluminum Bronze A286

Physical Properties	Imperial Units	Metric Units
Density	0.287 lb/in³	7.94 g/cm³
Melting Range	2500-2600ºF	1370-1430ºc
Hot Working Range	1900-2050ºF	1038-1121ºc
Max Service Temp (Air) Continuous Service	1800ºF	982ºc
Mean Liner Expansion 0-200ºc		16.5μm/m.ºc
Mean Liner Expansion 0-400 ºF	0.00916 in/in/ ºF x10³
Specific Heat	0.101Btu/lb/ ºF @68ºF	420J/kg ºc
Poisson’s Ratio	0.30	0.30
Curie Temperature	70-120 ºF	21-49 ºc
Magnetic Permeability
Solution Heat Treated	1.01	1.010
Aged	1.007	1.007
Thermal Conductivity	88Btu-in/hr/ft²/ ºF	12.7W/m. ºc
Electrical Conductivity	547ohm-circmil/ft	0.910μΩ.m
Electrical Resistivity	8.48µΩin	22.4μΩcm
Modulus of Elasticity 10³
Tension	29ksi	201N/mm²
Shear Modulus	11.2ksi	77N/mm²

While the data is believed to be accurate, Wieland Diversified makes no representation or warranty of any kind (expressed or implied) and assumes no responsibility with respect to the accuracy and values shown above; this information should only be used as a guide.

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