A193 B8MLCuNA Class 1A S31254 - ASTM A193/A193M-2020

Grade	A193 B8MLCuNA Class 1A
USA UNS	S31254
Corresponding Standard	ASTM A193/A193M-2020 Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
Classification	Austenitic Stainless Steel
Properties	Corrosion Resistance Forgability

A193 B8MLCuNA Class 1A Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N
Minimum Value	-	-	-	-	-	19.5	17.5	0.5	6	0.18
Maximum Value	0.02	0.8	1	0.03	0.01	20.5	18.5	1	6.5	0.25

• The intentional addition of Bi, Se, Te, and Pb is not permitted

A193 B8MLCuNA Class 1A Mechanical Properties

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
All Sizes	Solution Heat Treatment in Finished Condition	≥515	≥205	≥30	≥50	≤192

• d-diameter of bolt, screw, studs, double-end studs, bars and wire.

1 Approximate Comparison Table Austenitic Stainless Steel

China		Japan	United States		International Organization for Standardization	European Standard		Sweden
GB	ISC	JIS	ASTM	UNS	ISO	EN	Numerical Grade	SS
015Cr20Ni18Mo6CuN	S31252	SUS 312L	S31254	S31254	X1CrNiMoN 20-18-7 X1CrNiMoCuN20-18-7	X1CrNiMoCuN 20-18-7	1.4547	254SMO

2 Approximate Comparison Table Austenitic Stainless Steel

A193B8MLCuNAClass1A Corresponding Standards(Same grade name, different standards)

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