Grade A335 Grade P9
USA UNS K90941
Corresponding Standard ASTM A335/A335M-2024(b)
Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
Classification Alloy Steel
A335 Grade P9 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Mo
Minimum Value - 0.25 0.3 - - 8 0.9
Maximum Value 0.15 1 0.6 0.025 0.025 10 1.1
A335 Grade P9 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
full or isothermal anneal or normalize and temper (≥675°C) ≥415 ≥205 l: ≥30;t: ≥20
l=longitudinal;t=transverse
A335GradeP9 Corresponding Standards(Same grade name, different standards)

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