K21590 Class 1 - ASTM A989/A989M-2025

USA UNS	K21590 Class 1
Corresponding Standard	ASTM A989/A989M-2025 Standard Specification for Hot Isostatically-Pressed Alloy Steel Flanges, Fittings, Valves, and Parts for High Temperature Service
Classification	Alloy Steel

Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo
Minimum Value	0.05	-	0.3	-	-	2	0.87
Maximum Value	0.15	0.5	0.6	0.04	0.04	2.5	1.13

Mechanical Properties

Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
≥415	≥205	≥20	≥35	≤170

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!