Specifications
The following specifications cover Stainless Steel 253 MA(tm)
ASTM A167ASTM A182ASTM A213ASTM A240ASTM A249ASTM A269ASTM A276ASTM A312ASTM A336ASTM A358ASTM A409ASTM A473ASTM A479DIN 1.4893UNS S30815
Property Results
Related Metals:
Alloy 253
Chemistry Data :
Carbon
0.05 – 0.1
Cerium
0.03 – 0.08
Chromium
20 – 22
Iron
Balance
Manganese
0.8 max
Nickel
10 – 12
Nitrogen
0.14 – 0.2
Phosphorus
0.04 max
Silicon
1.4 – 2
Sulphur
0.03 max
Principal Design Features This alloy combines oxidation resistance up to 2100 F(1150 C) with high strength, good general corrosion resistance and ease of fabrication. It is austenitic in all conditions. Developed as an alternative for 310 and 446 stainless in heat resistant applications by replacing some of the chromium and silicon with domestically available rare earth metals. For improved creep strength at high temperature, consider Alloys 214, 556 and 230.
Applications Applications include a wide variety of components requiring high strength at elevated temperatures. Among them are included radiant heating tubes, heat exchangers, heat treating oven components, kilns, expansion bellows and stack dampers.
Machinability Similar in characteristics to other austenitic heat resisting alloys. Positive feeds and slow speeds combined with abundant cutting fluid can minimize this alloys’ high tendency to work harden.
Forming This alloy can be readily sheared, formed and punched. Due to its high strength, however, expect to use higher forces to counteract its tendency to spring-back. No forming should be performed in the range of 1200-1600 F(650-870 C) due to low ductility.
Welding All commonly known welding methods apply here, including SMAW, GMAW and SAW .Preheating and post weld annealing are not required. Filler metal should be of similar composition for maximum weld integrity and properties.
Forging 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.
Annealing 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.
Hardening This alloy will not harden by thermal treatment.
Physical Data :
Density (lb / cu. in.) 0.282
Specific Gravity 7.8
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.105
Electrical Resistivity (microhm-cm (at 68 Deg F)) 505
Poissons Ratio 0.31
Magnetic Permeability 1.01
Modulus of Elasticity Tension 29