Stainless Steel Material

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ASTM A403/ASME SA403

ASTM A403 is the globally recognized standard for austenitic stainless steel pipe fittings, including elbows, tees, reducers, and caps. These fittings are designed for pressure piping and other high-performance systems, offering excellent strength, durability, and corrosion resistance. The standard specifies key properties such as chemical composition, mechanical performance, and heat treatment requirements to ensure reliable performance across industries like oil and gas, chemical processing, and food production.

Stainless Steel Material Grades

UNS	ASTM Product Types
UNS	Fitting	Industrial Pipe	Forged Fittings
S30400	A430 WP304	A312 TP304	A182 F304
S30403	A430 WP304L	A312 TP304L	A182 F304L
S31008	A430 WP310S	A312 TP310S	–
S31600	A430 WP316	A312 TP316	A182 F316
S31603	A430 WP316L	A312 TP316L	A182 F316L
S32100	A430 WP321	A312 TP321	A182 F321
S32109	A430 WP321H	A312 TP321H	A182 F321H
S34700	A430 WP347	A312 TP347	A182 F347

Stainless Steel Chemical Properties

Stainless Steel Grade	Maximum Chemical Composition (%)
Stainless Steel Grade	C	Si	Mn	P	S	Cr	Ni	Mo
Wp304	0.08	1	2	0.045	0.03	18.0-20.0	8.0-11.0	–
Wp304H	0.04-0.10	1	2	0.045	0.03	18.0-20.0	8.0-11.0	–
Wp304L	0.03	1	2	0.045	0.03	18.0-20.0	8.0-12.0	–
Wp316	0.08	1	2	0.045	0.03	16.0-18.0	10.0-14.0	2.00-3.00
Wp316H	0.04-0.10	1	2	0.045	0.03	16.0-18.0	10.0-14.0	2.00-3.00
Wp316L	0.03	1	2	0.045	0.03	16.0-18.0	10.0-14.0	2.00-3.00
Wp312	0.08	1	2	0.045	0.03	17.0-19.0	9.0-12.0	–
Wp321H	0.04-0.10	1	2	0.045	0.03	17.0-19.0	9.0-12.0	–
Wp347	0.08	1	2	0.045	0.03	17.0-19.0	9.0-12.0	–
Wp347H	0.04-0.10	1	2	0.045	0.03	17.0-19.0	9.0-12.0	–

Stainless Steel Mechanical Properties

Stainless Steel Grade	Mechanical Properties
Stainless Steel Grade	Tensile Stress (N/mm²)	Yield Strengh (MPa)	Elongation (%)
Wp304	515	205	28
Wp304H	515	205	28
Wp304L	485	170	28
Wp316	515	205	28
Wp316H	515	205	28
Wp316L	485	170	28
Wp312	515	205	28
Wp321H	515	205	28
Wp347	515	205	28
Wp347H	515	205	28