Grade A289 Grade 7
Corresponding Standard ASTM A289/A289M-1997(R2018)
Standard Specification for Alloy Steel Forgings for Nonmagnetic Retaining Rings for Generators
Classification Alloy Steel
A289 Grade 7 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni N Ti V Al
Minimum Value - - 17.5 - - 17.5 - 0.45 - - -
Maximum Value 0.1 0.8 20 0.06 0.015 20 2 0.8 0.1 0.25 0.04
A289 Grade 7 Mechanical Properties
Tensile Strength
σb
Mpa
Specified Plastic Yield Strength
Rp0.2
Mpa
Elongation or Extension Rate
δ
%
Reduction of Area
ψ
%
Impact Energy Absorption
KV2
J
≥1345 ≥1310 ≥12 ≥35 ≥54

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