Cr |
Ni |
C |
Si |
Mn |
P |
S |
N |
Ce |
Fe |
20.00-22.00 |
10.00-12.00 |
0.05-0.10 |
1.40-2.00 |
≤0.08 |
≤0.04 |
≤0.03 |
0.14-0.20 |
0.03-0.08 |
Balance |
Chemical Composition
Mechanical Properties
Grade |
Tensile Strength ksi(MPa) |
Yield Strength ksi(MPa) |
Elongation in 2", % |
Hardness Brinell |
Hardness Rockwell |
253MA |
≥87(600) |
≥45(310) |
≥40 |
≤217HBW |
≤95HRB |
Application
- Pyrolysis Vessels
- Boiler Nozzles
- Corrugated Boxes
- Cyclones
- Bar Baskets
- Radiant Tubes
- Combustion chambers
Material Summary
Despite its lean nickel content, 253MA offers an outstanding combination of creep strength and high resistance to oxidation, sulphidation and erosion/abrasion at extremely high temperatures. This makes the alloy more economical than most heat resistant alloys.
The high heat resistant properties of 253MA are obtained by the tight control of micro alloy additions. Whilst the benefit of creep rupture strength is down to the combination of nitrogen, carbon and cerium, its superior oxidation resistance is a result of the combination of cerium and silicon.
Its strength at these temperatures is higher than that of alternatives such as Grade 310.