A193 B8N Class 2 S30451 304N - ASTM A193/A193M-2025

Grade	A193 B8N Class 2
USA UNS	S30451
Other Names
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

A193 B8N Class 2 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	N
Minimum Value	-	-	-	-	-	18	8	0.1
Maximum Value	0.08	1	2	0.045	0.03	20	11	0.16

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

A193 B8N Class 2 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
d≤M20	carbide solution treated and strain hardened	≥860	≥690	≥12	≥35	≥321HBW or ≥35HRC
M20＜d≤M24	carbide solution treated and strain hardened	≥795	≥550	≥15	≥35	≥321HBW or ≥35HRC
M24＜d≤M30	carbide solution treated and strain hardened	≥725	≥450	≥20	≥35	≥321HBW or ≥35HRC
M30＜d≤M36	carbide solution treated and strain hardened	≥690	≥345	≥28	≥45	≥321HBW or ≥35HRC

Approximate Comparison Table Austenitic Stainless Steel

China		Taiwan, China	Japan	South Korea	United States		International Organization for Standardization		European Standard
GB	ISC	CNS	JIS	KS	ASTM	UNS	ISO	Numerical Grade	EN	Numerical Grade
06Cr19Ni10N (0Cr19Ni9N)	S30458	304N1	SUS 304N1 SUS 304N2	STS 304N1	304N	S30451	X5CrNiN 19-9	4315-304-51-I	X5CrNiN 19-9	1.4315

A193B8NClass2 Corresponding Standards(Same grade name, different standards)

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