ASTM A403 SS304 Pipe Butt Weld Fitting

What is ASTM A403 material?

ASTM A403 is a standard specification for wrought austenitic stainless steel piping fittings. It covers forged and rolled fittings (elbows, tees, reducers, caps) designed for pressure piping, often used in corrosive or high-temperature environments like energy plants and oil/gas systems. Common grades include WP304/L and WP316/L.

 

Gnee supplies a comprehensive range of ASTM A403 SS304/304L industrial-grade stainless steel butt-weld pipe fittings, encompassing both seamless (WP-S) and welded (WP-W/WX) manufacturing processes. Product specifications span sizes from 1/2" to 48" (DN15–DN1200), with wall thicknesses strictly conforming to pressure ratings ranging from SCH 5S to SCH 160 and XXS. All fittings comply with ASME B16.9 dimensional standards and include a variety of components such as 45° and 90° elbows, tees, reducers, and caps.

As an ISO 9001:2015 certified supplier, Gnee provides an original Mill Test Certificate (MTC) compliant with the EN 10204 3.1 standard for every product batch. Furthermore, we offer support for PMI spectroscopic analysis and 100% X-ray nondestructive testing (specifically for WP-WX grades), thereby ensuring the high reliability of our products in high-pressure and corrosive environments-such as those found in chemical processing, natural gas, and food engineering applications.

 

 

304 SS Weld fittings material specification chart

Specifications	ASTM A403/ ASME SA403
Material	WP304
Dimension	ASME/ ANSI B16.9 | ASME B16.28 | MSS-SP-43 | BS1560 | BS4504 | BS10
Thickness of Fittings	SCH 10, SCH20, SCH 30, STD SCH 40, SCH 60, XS, SCH80, SCH100, SCH 120, SCH 140, SCH160, XXS available with NACE MR 01-75
Types	Seamless | Welded | Fabricated
Bending Radius	R= 1D, 8D, 3D, 2D, 6D, 5D, 10D
Size Range	½" NB to 24″ NB in Sch 10s, 40s, 80s, 160s, XXS. (DN6~DN100)
Size Ranges	Seamless ButtWeld Fitting: From 1/2″ - 10″ Welded ButtWeld Fitting: From 1/2″ - 48″

 

Chemical Composition of Grade WP304 Stainless Steel Butt weld Fittings

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	N
SS 304	0.35 max	2.0 max	1.0 max	0.045 max	0.03 max	18 – 20	-	8 – 13	-

 

Mechanical Properties of ASTM A403 SS 304 Butt weld Pipe Fittings

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
8.0 g/cm3	1400 °C (2550 °F)	Psi – 75000 , MPa – 515	Psi – 30000 , MPa – 205	35 %

 

304 Stainless Steel Buttweld Fittings Weight

Product Range And Theoretical Weights(Kg)
DN	Schedule 10s			Schedule 40s			Schedule 805
	90° Elbow	45° Elbow	Equal Tee	90° Elbow	45° Elbow	Equal Tee	90° Elbow	45° Elbow	Equal Tee
8	0.02	0.01	0.03	0.03	0.02	0.06	0.04	0.03	0.07
10	0.03	0.02	0.05	0.03	0.02	0.03	0.06	0.04	0.09
15	0.06	0.03	0.09	0.08	0.04	0.10	0.10	0.05	0.14
20	0.07	0.03	0.13	0.08	0.04	0.17	0.11	0.05	0.20
25	0.14	0.08	0.28	0.15	0.11	0.29	0.22	0.14	0.38
32	0.23	0.11	0.49	0.26	0.17	0.59	0.40	0.23	0.68
40	0.30	0.17	0.68	0.40	0.23	0.86	0.51	0.29	1.02
50	0.50	0.25	0.85	0.70	0.40	1.28	0.91	0.59	1.59
65	0.85	0.48	1.41	1.40	0.77	2.19	1.81	0.99	3.13
80	1.25	0.63	1.77	2.20	1.08	3.31	2.97	1.50	4.45
90	1.70	0.75	2.67	2.83	1.42	4.08	4.00	2.00	5.44
100	2.10	1.08	3.46	4.47	2.09	5.27	6.18	2.81	7.71
150	5.45	2.72	8.07	10.89	5.44	10.99	16.32	8.16	13.16
200	10.20	5.33	15.65	21.54	10.77	20.91	33.11	16.56	28.12
250	18.15	9.75	26.46	38.56	19.27	35.38	51.71	25.86	49.90
300	25.80	13.62	39.46	59.42	29.71	62.14	79.38	39.69	83.91

 

Product Range And Theoretical Weights(Kg)
DN	Schedule 10s			Schedule 40s			Schedule 805
	Con Reducer	Ecc Reducer	Reducing Tee	Con Reducer	Ecc Reducer	Reducing Tee	Con Reducer	Ecc Reducer	Reducing Tee
40x25	0.19	0.19	0.60	0.26	0.26	0.76	0.34	0.34	0.90
50x25	0.28	0.28	0.73	0.40	0.40	1.10	0.54	0.54	1.37
50x40	0.31	0.31	0.76	0.45	0.45	1.15	0.59	0.59	1.43
80x50	0.55	0.55	1.56	1.00	1.00	2.91	1.79	1.79	3.91
100x50	0.78	0.78	2.94	1.50	1.50	4.48	1.95	1.95	6.55
100x80	0.87	0.87	3.04	1.74	1.74	4.64	2.33	2.33	6.79
150x80	1.82	1.82	6.86	3.95	3.95	9.68	5.51	5.51	11.57
150x100	1.96	1.96	7.10	4.07	4.07	11.94	5.96	5.96	11.97
200x100	3.01	3.01	13.46	6.55	6.55	17.98	9.23	9.23	24.18
200x150	3.19	3.19	14.08	6.74	6.74	18.82	10.12	10.12	25.31

 

Capacity of Grade 304 Stainless Steel Pipe Fittings

Product			Size*						Wall Thickness**
Elbow			1/2"-24"						SCH10S~XXS
			8"-104"						SCH5S~80S/XS
Tee			1/2"-24"						SCH10S~XXS
			8"-104"						SCH5S~80S/XS
Reducer			1/2"-24"						SCH10S~XXS
			8"-104"						SCH5S~80S/XS
Cap			1/2"-80"						SCH10S~SCH160
Lap Joint Stub End			1/2"-24"						SCH5S~80S/XS
			8"-80"						SCH5S~80S/XS

 

SS 304 Fittings Hs Code

HSN Code	Description
73181600	Stainless Steel 304 Pipe Fittings

 

Delivery Cycle

Common Specifications (e.g., DN15–DN300, SCH 10S/40S Elbows and Tees): 3–7 business days.
Fittings Requiring Custom Wall Thickness or Non-Standard Dimensions: 15–25 business days.
Bulk or Custom Project Orders (Project Orders): Extra-large diameters (up to 48"), special wall thicknesses (SCH XXS), or WP-WX grades (requiring 100% NDT/flaw detection): 30–45 business days.

 

Value-Added Services

Accompanying Documentation: Each shipment includes the original manufacturer's MTC (Material Test Certificate, compliant with EN 10204 3.1), packing list, commercial invoice, and Certificate of Origin.
Third-Party Inspection: We support and cooperate with third-party agencies-such as SGS, BV, and TUV-to facilitate manufacturing supervision, sample testing, and pre-shipment inspections.

 

Packaging

Surface Protection: All pipe fittings are fitted with plastic end caps (to protect the bevels), and their surfaces are wrapped in pearl cotton or bubble wrap to prevent abrasion.
Small-Diameter Fittings (1/2" - 8"): Packed into heavy-duty cardboard boxes, which are then consolidated into fumigation-free plywood cases; the total weight per case is typically kept within 1–2 tons.
Large-Diameter Fittings (10" and above): Secured using wooden pallets and reinforced with steel strapping.
Protection Standards: All wooden packaging complies with the ISPM 15 international phytosanitary standard; the interior is lined with moisture-proof plastic film to withstand the humid conditions associated with overseas shipping.