ASME SA335 P91 Seamless Ferritic Alloy Steel Pipe
Oct 24, 2023
ASTM A335 P91 steel is an improved 9Cr-1Mo steel. When V, Nb and other alloy elements are added into the original 9Cr-1Mo martensitic steel, the allowable stress at 550-650 degree is significantly higher than that of 10CrMo910 and TP304 steel. Compared with 10CrMo910 steel, under the same temperature and pressure conditions, the pipe wall thickness can be reduced by 50%. The recommended use temperature of A335 P91 steel is below 650 degree , A335 P91 steel has good high temperature resistance and resistance Corrosion and creep resistance,
ASTM A335 P91 steel pipe can be used in high pressure environment with steam temperature over 600 degree .
Material properties of ASTM A335 P91:
At present, A335 P91 material has been widely used in reheater, superheater header, nozzle seat and steam pipeline of subcritical and supercritical power station boilers. A335 P91 belongs to martensitic heat strength steel. The pipe made of P91 steel has good mechanical properties, high temperature resistance and creep resistance.
Chemical Composition of ASTM A335 P91
| C | P | S | ||||
| A335 P91 | 0.08-0.12 | 0.3-0.6 | Less than or equal to 0.02 | Less than or equal to 0.01 | 0.2-0.5 | 8.0-9.5 |
| V | N | |||||
| 0.85-1.05 | 0.18-0.25 | 0.03-0.07 | Less than or equal to 0.4 | Less than or equal to 0.04 | 0.06-0.10 |
Mechanical Properties of ASTM A335 P91
| P91 | Greater than or equal to 510 | Greater than or equal to 400 | Greater than or equal to 20 |
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