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Chrome Moly P91

Penn Stainless offers Chrome Moly P91 in welded large diameter pipe.

Click on the tabs below for more information about Chrome Moly P91 grade stainless.

General Properties

Chrome Moly P91 grade shows superior resistance to cracking from hydrogen attack and hot sulfide corrosion. Chrome Moly grade P91 has a better overall strength to weight ratio than steel, which allows for reduced weight and thinner walls in Chrome Moly P91 products. This grade of steel has strong resistance to rupturing and high pressures and/or temperatures, and is commonly used for high temperature and pressure services.  Chrome Moly P91 is prominent in the power generation industry due to its tensile strength, corrosion resistance and high-temperature strength.

Common Applications

  • Power generation




  • Resistant to hot sulfide corrosion cracking
  • High resistance to rupturing at high temperatures and pressures


  • Chrome moly P91 shows excellent weldability

Heat Treatment

  • Can be used for NACE Applications where sour environments are under high temp and pressure
  • Ideal for creep rupture applications
  • Can handle high temperatures with very low elasticity

Chemical Properties:

Element Composition
Carbon 0.05-0.15
Manganese 0.30-0.60
Chromium 8.00-9.50
Molybdenum 0.8-1.05

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