A803 18-2 S44400 - ASTM A803/A803M-2016(R2021)

Grade	A803 18-2
USA UNS	S44400
Corresponding Standard	ASTM A803/A803M-2016(R2021) Standard Specification for Seamless and Welded Ferritic Stainless Steel Feedwater Heater Tubes
Classification	Ferritic Stainless Steel

A803 18-2 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	N	More
Minimum Value	-	-	-	-	-	17.5	-	1.75	-	Ti+Nb = 0.2+4(C+N) min; 0.80% max
Maximum Value	0.025	1	1	0.04	0.03	19.5	1	2.5	0.035	Ti+Nb = 0.2+4(C+N) min; 0.80% max

A803 18-2 Mechanical Properties

Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
≥415	≥240	≥20	≤217

Approximate Comparison Table Ferritic Stainless Steel

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

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