S31640 - ASTM A479/A479M-2018

USA UNS	S31640
ASTM Specification or Grade	316Cb
Corresponding Standard	ASTM A479/A479M-2018 Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
Classification	Austenitic Stainless Steel

Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	N	More
Minimum Value	-	-	-	-	-	16	10	2	-	Cb:10×C~1.1
Maximum Value	0.08	1	2	0.045	0.03	18	14	3	0.1	Cb:10×C~1.1

◎ New designations established in accordance with Practice E527 and SAE J1086 published jointly by ASTM and SAE. See ASTM DS-56C, available from ASTM Headquarters.

Mechanical Properties

condition	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %
All specifications	Annealing	≥ 515 ①	≥205	in 2 in.[50 mm] or 4D ≥ 30	≥ 40 ②

◎ d-diameter, t-thickness

Approximate Comparison Table Austenitic Stainless Steel

China	United States		International Organization for Standardization		European Standard
ISC	ASTM	UNS	ISO	Numerical Grade	EN	Numerical Grade
S31678	316Nb (316Cb)	S31640	X6CrNiMoNb17-12-2	4580-316-40-I	X6CrNiMoNb17-12-2	1.4580

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