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Stainless steel butt weld fittings are defined as components used in piping systems to change direction, branch, or change the diameter of the pipe and are mechanically connected to the system. Butt-weld fittings are stainless steel fittings with butt-weld connections for easy installation and maintenance. type 304 stainless steel is a chromium-nickel material that resists corrosion caused by water, heat, brine, acids, minerals, and peaty soils. type 316 stainless steel has a higher nickel content than 304 stainless steel, plus molybdenum for greater corrosion resistance.

ASTM A403 is a standard specification that covers wrought stainless steel fittings for pressure piping applications. Several grades of austenitic. Several grades of austenitic stainless steel alloys are included in this specification Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards, respectively.

We supply stainless steel butt weld fittings in accordance with ASME B16.9, EN10253-4/-3, including stainless steel elbows, equal/reduced tees, conc/ecc reducers, stainless steel caps, stainless steel short ends, etc. We offer a wide range of SS butt weld fittings in various stainless steel grades 304, 304L, 316, 316L, 317, 317L, 321, 904L, etc.

Butt weld fittings are connected to pipelines for transporting air, water, natural gas, and oil for pipeline applications as well as food and dairy processing. Stainless steel pipe fittings resist corrosion from corrosive chemicals, corrosive liquids, oils, and gases and can withstand pressure and high temperatures. type 304 stainless steel is a chromium-nickel material that resists corrosion caused by water, heat, brine, acids, minerals, and peaty soils. type 316 stainless steel has a higher nickel content than 304 stainless steel, plus molybdenum for greater corrosion resistance.

Specifications of ASTM A403 Stainless Steel Butt Weld Fitting

Specification: ASTM A403/ASME SA403

Standard: ASTM, ASME

Dimensions: ANSI/ASME B16.9, B16.28, B16.25, etc.

Type: Butt Weld

Fitting Type: Cross, Elbow, Tee, Cap, Return Bend, Reducer, etc.

Material: 304/304L, 310/310S, 316/316L, 321/321H, 410, 420, etc.

Sizes: 1/2” to 48”

Thickness: SCH 5S, SCH 10S, SCH 20S, SCH STD, SCH 40S, SCH 60, SCH 80S, SCH 100, SCH 120, SCH 140, SCH 160S, SCH XXS, etc.

Bend Radius: R=1D, 2D, 3D, 5D, 8D, 10D, or as required

Payment Terms: T/T, L/C

Delivery Time: As per quantity required

Chemical Composition (%) of ASTM A403 Stainless Steel Butt Weld Fitting

Grade	UNS	EN	C, max	Cr	Ni	Mo	Ti
304	S30400	1.4301	0.08	18.00-20.00	8.00-12.00	-	-
304L	S30403	1.4307	0.035	18.00-20.00	8.00-12.00	-	-
310S	S31008	1.4845	0.08	24.00-26.00	19.00-22.00	-	-
316	S31600	1.4401	0.08	16.00-18.00	10.00-14.00	2.00-3.00	-
316L	S31603	1.4404	0.035	16.00-18.00	10.00-14.00	2.00-3.00	-
321	S32100	1.4541	0.08	17.00-19.00	9.00-12.00	-	5X(C+N )-0.70
347	S34700	1.4550	0.08	16.00-18.00	10.00-14.00	-	-
347H	S34709	1.4551	0.04-0.10	17.00-20.00	9.00-13.00	-	-

Mechanical Properties of ASTM A403 Stainless Steel Butt Weld Fitting

All WP and CR Grades	Tensile Strength, ksi [MPa], min	Yield Strength, ksi [MPa], min
304/304LH, 304H, 309, 310, 316/316LN, 316H, 317/317L, 321/321H, 347/347H, 348/348H, S31725	75 [515]	30 [205]
304L, 316L	70 [485]	25 [170]
304N, 316N, S31726	80 [550]	35 [240]
XM-19	100 [690]	55 [380]
S31254	94 [650] to 119 [820]	44 [300]
S33228	73 [500]	27 [185]
S34565	115 [795]	60 [415]

Equivalent Grades of ASTM A403 Stainless Steel Butt Weld Fitting

STANDARD	WERKSTOFF NR.	UNS	JIS	BS	GOST	AFNOR	EN
SS 304	1.4301	S30400	SUS 304	304S31	08Х18Н10	Z7CN18‐09	X5CrNi18-10
SS 304L	1.4306/1.4307	S30403	SUS 304L	304S11	03Х18Н11	Z3CN18‐10	X2CrNi18-9/ X2CrNi19-11
SS 304H	1.4301	S30409	-	-	-	-	-