S21904 - ASTM A479/A479M-2018

USA UNS	S21904
ASTM Specification or Grade	XM-11
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	N
Minimum Value	-	-	8	-	-	19	5.5	0.15
Maximum Value	0.04	1	10	0.045	0.03	21.5	7.5	0.4

◎ 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	≥620	≥345	in 2 in.[50 mm] or 4D ≥ 45	≥ 60 ①

◎ d-diameter, t-thickness

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