ASTM A335 Grade P91 High-Temperature Service Pipe supplied by Hebei K-Steel pipe Industry

The ASTM A335 Gr. P91 seamless pipe supplied by Hebei K-Steel Pipe Industry is an advanced ferritic alloy steel pipe specifically developed for high-temperature and ultra-high-pressure service. With a nominal composition of 9% chromium, 1% molybdenum, and controlled additions of vanadium and niobium, Grade P91 offers significantly improved creep strength and oxidation resistance compared to traditional Cr-Mo grades like P22 or P9.

 

Key Features:

1) Superior creep rupture strength – approximately twice that of P22 at high temperatures

2) Excellent oxidation and corrosion resistance in high-temperature steam environments

3) High thermal fatigue resistance – ideal for cyclic operation

4) Reduced wall thickness possible compared to lower-grade materials, saving weight and cost

5) Good weldability with proper preheating and post-weld heat treatment (PWHT)

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