S. S. 253 MA

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UNS - S30815

Stainless Steel 253 MA is an incline austenitic heat resistant alloy with high strength and extraordinary oxidation resistance. 253 MA keeps up its heat resistant properties by advanced control of micro alloy additions.

The utilization of uncommon earth metals joined with silicon, which provides better oxidation resistance up to 2000°F. Nitrogen, carbon and a dispersion of uncommon earth and alkali metal oxides join to give creep rupture strength similar to the nickel base alloys. A wide variety of parts requiring high strength at high temperatures for example heat exchangers, kilns, stack dampers as well as oven components are common applications for Stainless Steel 253 MA.

  • Excellent oxidation resistance to 2000°F
  • High creep-rupture strength

  • Burners, Boiler Nozzles
  • Petrochemical and refinery tube hangers
  • Heat exchangers
  • Expansion bellow
  • Stack dampers


Stainless steel 253 MA is promptly fabricated by a standard commercial process. In comparison to carbon steel, stainless steels are tougher and tend to work harden quickly. So, with the positive feeds and slow speeds combined with abundant cutting fluid S.S 253 MA alloys tendency to work harden may be minimized.


It is comparable in attributes to other austenitic heat resisting alloys. Positive feeds and slow speeds joined with huge cutting fluid can minimize this alloy, high tendency to work harden.


All ordinarily known welding techniques apply here, which involve SMAW, GMAW and SAW. Preheating and post weld annealing are not required. Filler metal should be of comparable composition for maximum weld integrity and properties.


This alloy can be promptly sheared, formed and punched. Because of its high strength, however, expect to use higher forces to counteract its tendency to spring-back. No forming should be performed in the scope of 1200-1600 F (650-870 C) because of low ductility.


Heat to 2000 F(1100 C) and finish at 1650 F(900 C). Do not hold or soak at temperature due to problems associated with excessive grain growth.


Stress relieve at 1560-1740 F (850-950 C), held for 10-15 minutes followed by air cooling. Full annealing is obtained by heating to 1920-2100 F (1050-1150 C), holding for 10-15 minutes followed by air cooling.


This alloy will not harden by thermal treatment.

Chemical Composition

0.05 - 0.100.14 - 0.201.4 - 2.00.04 max0.03 max20.0 - 22.00.8 max10.0 - 12.00.03 - 0.08

Mechanical Properties

Tensile Strength (ksi)0.2% Yield Strength (ksi)Elongation% in 2 inches

Physical Properties

UnitsTemperature in °C
Density7.8 g/cm³Room
Specific Heat0.12 Kcal/kg.C20°
Melting Range1371 - 1432°C-
Modulus of Elasticity 200 KN/mm²20°
Electrical Resistivity84 µΩ.cmRoom
Coefficient of Expansion16.5 µm/m °C30 - 100°
Thermal Conductivity14.3 W/m -°K20°

ASTM Specifications

PlateBarPipe SMLSPipe Welded
A 240, A 480, A 167A 276, A 479A 213, A 312A 312, A 358, A 409, A 813, A 814


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