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Alloy Steel Seamless Pipes ASTM A335 / ASME SA 335 Grade P91

Alloy Steel Seamless Pipes ASTM A335 / ASME SA 335 Grade P91

P91 is a chrome moly alloy metal that contains excellent strength and temperature resistance. It is designed for enhanced creep strength, making it a creep strength enhanced ferritic (CSEF). This metal is made by normalizing at 1050 °C, air cooling to 200 °C, and then tempered through heating to 760 °C. This process is the main reason behind P91’s creep strength and durability. P91 stands for the metal’s composition of 9% chrome and 1% molybdenum plus vanadium. The chrome increases temperature strength and oxidation resistance. The molybdenum increases the elasticity, resistance to wear, and high temperature creep strength.

A335/SA335 P91 is a ferritic alloy steel that has very high strength properties, which do not deteriorate with time, and are creep resistant. It is also called 9 Cr 1 Mo steel, or chrome moly pipe, based on its composition.


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    Alloy Steel Seamless Pipes ASTM A335 / ASME SA 335 Grade P91

    The manufacturing procedure of ASME SA335 grade P91 pipe starts with its forming by either cold drawing or hot finished followed by heat treatment. The heat treatment begins with the process of normalizing the pipe at 1050 °C followed by cooling down by air at 200 °C and then tempering at about 760 °C. The manufacturing process makes the astm a335 P91 alloy steel pipe well suited to forming, bending, flanging, and fusion welding.

    The astm a335 P91 pipe is a seamless Pipe meant for high temperature applications. These pipes are made from ferritic Alloy-Steel. Chemically the a335 P91 welded pipe contains elements like Molybdenum (Mo) and Chromium added to the alloy. When Molybdenum and chromium are added to the alloy, there is an increase in the tensile strength of the sa335 grade P91 pipe. The tensile strength of the a335 grade P91 pipe is 415 Mpa, while its yield strength is 205 Mpa. The elongation percentage of the pipe ranges between 20% to 30%.

    Features : 

    •  Non-deteriorating
    •  Decreased thickness
    •  Higher creep strength

    Alloy Steel Seamless Pipes ASTM A335 / ASME SA 335 Grade P91 Application Industries : 

    •  IPower generation
    •  Gas processing equipment
    •  Oil services
    •  Petrochemical plants
    •  Heaters/reheat lines
    •  Boilers

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