S41040 - ASTM A479/A479M-2018

USA UNS	S41040
ASTM Specification or Grade	XM-30
Corresponding Standard	ASTM A479/A479M-2018 Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
Classification	Martensitic Stainless Steel

Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Cb
Minimum Value	-	-	-	-	-	11.5	0.05
Maximum Value	0.18	1	1	0.04	0.03	13.5	0.3

◎ 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 %	Hardness HBW
All specifications	Annealing	≥485	≥275	in 2 in.[50 mm] or 4D ≥ 13 ①	≥ 45 ①②	≤235
All specifications	Quenching and Tempering	≥860	≥690	in 2 in.[50 mm] or 4D ≥ 13	≥ 45 ②	≤302

◎ d-diameter, t-thickness

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