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Standard Specification for A335 Grade P91

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On 2024-12-09
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Grade A335 Grade P91
UNS K91560
Other name A335 Grade P91 type 1,A335 Grade P91 type 2,P91
Standard ASTM A335/A335M-2018
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
Classification Alloy steel,Alloy steel seamless steel pipe
Introductions Suitable for high temperature environment. Suitable for bending, flanging and similar forming operations, and for fusion welding.
It is used to make steel pipes for oil exploitation, natural gas transmission, thermal power generation and other fields.

 

A335 Grade P91 Chemical Element Content (%)
Type1 Constituent C Si Mn P S Cr Ni Mo N Ti V Nb Zr Al More
Min 0.08 0.2 0.3 – – 8 – 0.85 0.03 – 0.18 0.06 – – /
Max 0.12 0.5 0.6 0.02 0.01 9.5 0.4 1.05 0.07 0.01 0.25 0.1 0.01 0.02
Type2 Constituent C Si Mn P S Cr Ni Cu Mo As N Ti W V Nb Zr B Al Sn Sb More
Min 0.08 0.2 0.3 – – 8 – – 0.85 – 0.035 – – 0.18 0.06 – – – – – N/Al≥ 4.0
Max 0.12 0.4 0.5 0.02 0.005 9.5 0.2 0.1 1.05 0.01 0.07 0.01 0.05 0.25 0.1 0.01 0.001 0.02 0.01 0.003
Note: Nb=Cb

 

A335 Grade P91 Mechanical properties
Sample Condition Tensile Strength Yield stress Elongation Hardness
σb σs δ HBW
Mpa Mpa %
Seamless pipe; Landscape orientation Heat Treatment ≥585 ≥415 ≥13 190~250
Seamless pipe; portrait Heat Treatment ≥20
The elongation data measured by wall thickness of the material and the material heat treatment system are not listed in the table, and the detailed data are in the original
Heat treatment:
Normalizing and tempering or quenching and tempering
Normalizing temperature 1040~1080°C, tempering temperature 730~800°C
Quenching temperature 1040~1080°C, tempering temperature 730~800°C
Newer Standard Specification for A335 Grade P22
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Older Standard Specification for A194 Grade 8FA

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