UNS S30815

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RAUNS S30815 is a poor austenitic heat-resistant alloy with high strength and excellent oxidation resistance. RA 253 MA achieves its heat resistance through advanced control of microalloy additives. Rare earth metals are combined with silicon for superior oxidation resistance up to 2000°F. Nitrogen, carbon, and, to some extent, rare earth and alkali metal oxides, combined, provide creep rupture strength comparable to that of nickel-based alloys. HuaNickel RA 253 MA is only fairly resistant to carburizing. 309 is a little bit in this regard. The addition of nitrogen enhances austenite stability inHuaNickel  RA 253 MA, thereby delaying the formation of embryomorphic sigma phases.

UNS S30815Chemical composition:

  Fe Cr Ni Mn Si C Ce S P
Min Bal 20 10 1.4 0.05 0.14  
Max 22 12 0.8 2 0.1 0.2 0.03 0.04

UNS S30815Physical properties:

Density 0.282 lb/in3
Melting point 2500 – 2610°F

UNS S30815Mechanical properties:

Temperature, °F 68 1292 1562 1832
Tensile strength, ksi 102 56.4 24.8 10.8
Yield strength, ksi 51.6 23 14.6 6.2
Elongation, 2% 51 44

UNS S30815Stainless steel characteristics:

Excellent oxidation resistance through 2000°F

High creep rupture strength

Excellent thermal shock resistanceandGood weldability

UNS S30815Uses of stainless steel:

Pulverized coal burner in a power boiler\Petrochemical, refinery and steam superheater tubular hangers

Radiant heating tubes for steel and aluminum annealing\Thermal oxidizers, expansion bellows, furnace fans, dampers, fluidized bed combustion chambers, cyclones, rotary kilns and calciners

Relevant standards:

ASME: SA-240, SA-479, SA-312, SA-249

ASTM: A 240, A 276, A 312, A 358, A 409, A 473, A 479, A 813, A 814

Detail datasheet