A335 P91
High-Temp SteelA335 P91
ASTM steel grade A335 P91.
Chemical Composition (%)
| C | 1.5 |
|---|---|
| SI | 0.1 |
| MN | 0.2 |
| CR | 11 |
| MO | 0.7 |
| V | 1.1 |
| P | 0.03 |
| S | 0.03 |
Mechanical Properties
Hardness(annealed):≤230 HB;Hardness(hardened):48-56 HRC
Equivalent Standards
ASTM A335 P91
Applications
Pressure/structural/service
Available Forms
Plate,Bar
Uses
Heat- and creep-resistant steel for elevated-temperature service with stable strength and oxidation resistance. Used in furnace parts, exhaust manifolds, turbine components, boiler tubes and engine valves.
Heat Treatment
Normally used in the solution-annealed or precipitation-hardened condition; stabilise/age per the grade (e.g., 650–800 °C ageing). Avoid long exposure in the sigma/475 °C embrittlement ranges.
Precautions
Maintain the recommended heat-treatment envelope; prolonged time in embrittlement ranges reduces ductility. Use descaling/protective atmosphere to limit scaling.
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