A193 B8ML4CuNA Class 1A S31730 - ASTM A193/A193M-2025

Grade	A193 B8ML4CuNA Class 1A
USA UNS	S31730
Corresponding Standard	ASTM A193/A193M-2025 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 Good Forgability Good Weldability

A193 B8ML4CuNA Class 1A Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N
Minimum Value	-	-	-	-	-	17	15	4	3	-
Maximum Value	0.03	1	2	0.04	0.01	19	16.5	5	4	0.045

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

A193 B8ML4CuNA Class 1A Mechanical Properties

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
All Diameters	carbide solution treated	≥480	≥175	≥35	≥50	HRB ≤90

A193B8ML4CuNAClass1A Corresponding Standards(Same grade name, different standards)

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