S44400 - ASTM A479/A479M-2018

USA UNS	S44400
ASTM Specification or Grade	444
Corresponding Standard	ASTM A479/A479M-2018 Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
Classification	Ferritic Stainless Steel

Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	N	More
Minimum Value	-	-	-	-	-	17.5	-	1.75	-	(Ti+Cb) 0.2+4×(C+N)~0.8
Maximum Value	0.025	1	1	0.04	0.03	19.5	1	2.5	0.035	(Ti+Cb) 0.2+4×(C+N)~0.8

◎ 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	≥415	≥310	in 2 in.[50 mm] or 4D ≥ 20 ①	≥ 45 ①②	≤217

◎ d-diameter, t-thickness

Approximate Comparison Table

China	Japan	United States		International Organization for Standardization		France	European Standard		Sweden
ISC	JIS	ASTM	UNS	ISO	Numerical Grade	NF EN/NF	EN	Numerical Grade	SS
S11972	SUS 444	444	S44400	X2CrMoTi18-2	4521-444-00-I	Z3CDT18-02	X2CrMoTi18-2	1.4521	2326

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