P91 steel is equivalent to the national standard 10Cr9Mo1VNbN. It not only has high oxidation resistance and high temperature steam corrosion resistance, but also has good impact toughness, high and stable durable plasticity and thermal strength. When the service temperature is lower than 620, the allowable stress is higher than that of austenitic stainless steel. Above 550, the recommended design allowable stress is about twice that of T9 and 2.25Cr-1Mo steels. P91 steel is a new soda water pipeline steel used to fill the temperature range of 600-650 between pearlitic heat-resistant steel and austenitic heat-resistant steel. It belongs to martensitic heat-resistant steel. Its maximum service temperature is 650. On the basis of 9Cr-1Mo steel, strengthening elements such as V, Nb and N are added to form a new type of modified steel.
Yield strength of P91 steel plate: ≥415 (MPa)
Elongation: ≥20 (%)
Chemical composition of P91 steel:
C 0.08-0.12, Mn 0.30-0.60, Si 0.20-0.50, P≤0.02, S≤0.01, Cr 8.0-9.5, Mo 0.85-1.05, V 0.18-0.25, Nb 0.06-0.1, N 0.03-0.07, Al ≤0.04, Ni ≤0.4
P91 steel plate application:
P91 steel has been widely used in superheaters, reheaters and main steam pipes of power plant boilers due to its good high temperature endurance strength, thermal stability and high temperature creep resistance.
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