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Grade CP22
USA UNS J21890
Corresponding Standard ASTM A426/A426M-2025
Standard Specification for Centrifugally Cast Ferritic Alloy Steel Pipe for High-Temperature Service
Classification Cast Steel
CP22 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Mo
Minimum Value 0.05 - 0.3 - - 2 0.9
Maximum Value 0.15 0.6 0.7 0.03 0.025 2.75 1.2
CP22 Mechanical Properties
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
≥485 ≥275 ≥20 ≥35 ≤201
1 Approximate Comparison Table Cast Steel
China United States International Organization for Standardization
GB UNS ISO Numerical Grade
ZG17Cr2Mo
ZG17Cr2Mo1 		J21890 G17CrMo9-10 1.7379
2 Approximate Comparison Table Cast Steel
Japan United States Germany United Kingdom
JIS ASTM UNS DIN EN/DIN W-Nr. BS EN/BS
SCPH32-CF WC9 J21890 GS-12CrMo 9 10 1.7380 622
B3

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