Stainless Steel Buttweld Fittings

Midland Alloys Inc. is a trusted Indian manufacturer and global supplier of stainless steel buttweld fittings, serving a wide network of industries with precision-engineered piping solutions. These fittings are used to join pipes or change flow direction or diameter in a piping system. Stainless Steel Buttweld Fittings, commonly known as SS Buttweld Fittings, are made for high-strength applications where corrosion resistance and leak-free performance are essential. Made from high-quality materials like SS 304L, SS 316 and Stainless 904L, these fittings adhere to international standards such as ASME SA403, ANSI B16.9, and EN 10253. With excellent chemical composition, tensile strength, elongation, and dimensional accuracy, stainless steel buttweld pipe fittings offer dependable performance across aggressive environments. They are available in seamless, ERW, and fabricated variants with sizes ranging from 1/8″ to 48″ NB.

Benefits of Stainless Steel Buttweld Pipe Fittings

Using stainless buttweld fittings brings long-term value and performance in industrial piping systems. These fittings are perfect for high pressure and corrosive environments due to their precise design, and metallurgical strength.

Strong and durable structural integrity
Outstanding resistance to corrosion in challenging conditions
Leak free weld joints minimize the fluid loss risks
Turbulence, and pressure drops are reduced by a smooth inner bore
Adaptable to different flow designs and piping configurations
Low maintenance need over extended service life
Cost-effective compared to flanged or threaded connections
Resistant to high temperature and mechanical stress

Difference Between Stainless Steel Buttweld Fittings vs. Duplex Steel Buttweld Fittings

Stainless steel buttweld fittings offer excellent corrosion resistance, especially in oxidising environments, and are widely used for general-purpose applications. On the other hand, duplex steel buttweld fittings bring together the strengths of austenitic and ferritic steel that offers higher strength and better resistance to stress corrosion cracking. Duplex grades perform better in chloride-enriched and severely corrosive environments but might need tighter welding control due to their dual-phase microstructure. Duplex grades are frequently selected for more demanding offshore, marine, or chemical processing applications, even though stainless steel fittings like SS 316 are appropriate for most of the moderate-to-severe environments.

Specification of Stainless Steel Buttweld Pipe Fittings

Types of Stainless Steel Buttweld Pipe Fittings

Elbow (90°, 45°, Long/Short Radius)

Used to change the direction of flow in a pipeline at specified angles; available in short or long radius.
Tee (Equal & Reducing)

Divides flow into two branches; an equal tee has all ends the same size, a reducing tee has one smaller outlet.
Reducer (Concentric & Eccentric)

Connects pipes of different diameters; concentric type is symmetrical, eccentric has an offset centerline.
Stub End (Short & Long Pattern)

Used with lap joint flanges to allow easy dismantling; available in short and long lengths.
End Cap

Closes the end of a pipe to stop flow and protect the system.
Cross (Equal & Reducing)

Connects four pipes; equal type has all ports the same size, reducing type has different sized outlets.
Lateral Tee

Branches pipe at a 45° angle for smoother flow direction changes.

Pipe Bend

Makes gradual directional changes in piping with large-radius curves.
Return Bends (180°)

Turns the flow 180 degrees, commonly used in U-shaped configurations.
Collar

Provides a flat surface for bolted connections, often used with flanges.
Nipple

Short length of pipe with male threads or beveled ends for close connection between fittings.
Barred Tee

Features a bar across the branch opening to prevent flow into unwanted areas, used in piggable systems.
Expansion Joint

Absorbs thermal expansion and vibration in piping systems.
Swage Nipple

Connects pipes of different diameters, typically from a larger pipe to a smaller one.
Reducer Insert

Inserted into a fitting to reduce the outlet size without using a separate reducer.

Contact Midland Alloys Inc. for Your SS Buttweld Pipe Fittings Needs

Contact us today to discuss how SS Buttweld Pipe Fittings can benefit your application. Whether you need guidance in selecting the right Buttweld Fittings or have specific requirements, our team of experts is here to help you find the optimal solution.

Stainless Steel Buttweld Fittings We Offer

Stainless Steel 304/304L Buttweld Fittings

Stainless Steel 310/310S Buttweld Fittings

Stainless Steel 316/316L Buttweld Fittings

Stainless Steel 316Ti Buttweld Fittings

Stainless Steel 317/317L Buttweld Fittings

Stainless Steel 347/347H Buttweld Fittings

Stainless Steel 321/321H Buttweld Fittings

Stainless Steel 904L Buttweld Fittings

Stainless Steel 253MA Buttweld Fittings

SMO 254 Buttweld Fittings

Pressure Rating

Dimensions

Weight Chart

Pressure Rating

Stainless Steel Buttweld Fittings Pressure Rating Chart

NPS (inch)	Pipe Sch.	Wall Thk. (in)	OD (inch)	Temperature
				100	200	300	400	500
				Allowable Stress (Pressure Rating)
				16700	16700	16700	15500	14400
1″	40	0.133	1.315	2205	2205	2205	2047	1902
	80	0.179	1.315	3061	3061	3061	2841	2640
	160	0.250	1.315	4493	4493	4493	4170	3874
1 1/2″	40	0.145	1.900	1629	1629	1629	1512	1404
	80	0.200	1.900	2303	2303	2303	2138	1986
	160	0.281	1.900	3362	3362	3362	3120	2899
2″	40	0.154	2.375	1371	1371	1371	1272	1182
	80	0.218	2.375	1985	1985	1985	1843	1712
	160	0.344	2.375	3283	3283	3283	3047	2831
3″	40	0.216	3.500	1301	1301	1301	1208	1122
	80	0.300	3.500	1844	1844	1844	1712	1590
	160	0.438	3.500	2787	2787	2787	2587	2403
4″	40	0.237	4.500	1102	1102	1102	1023	950
	80	0.337	4.500	1596	1596	1596	1482	1377
	160	0.531	4.500	2611	2611	2611	2424	2552
5″	40	0.258	5.563	965	965	965	896	832
	80	0.375	5.563	1428	1428	1428	1325	1231
	160	0.625	5.563	2474	2474	2474	2296	2133
6″	40	0.280	6.625	877	877	877	814	756
	80	0.432	6.625	1379	1379	1379	1280	1189
	160	0.719	6.625	2382	2382	2382	2211	2054
8″	40	0.322	8.625	771	771	771	716	665
	80	0.500	8.625	1218	1218	1218	1131	1050
	160	0.906	8.625	2298	2298	2298	2133	1982
10″	40	0.365	10.750	699	699	699	649	603
	80	0.594	10.750	1159	1159	1159	1075	999
	160	1.125	10.750	2289	2289	2289	2124	1974

Dimensions

Weight Chart

Manufacturing Process of SS Buttweld Fittings

Pipe

Cutting

Forming

Sizing

Heat Treatment

Pickling

Beveling

Polishing

Sand Blasting

Elbow

Inspection

Analytic

Marking

Packing & Shipping

Applications of SS Buttweld Fittings

Stainless steel buttweld seamless fittings find application in various industries due to their weldability, corrosion resistance and reliability. In chemical processing, they handle aggressive fluids and high-temperature environments. The petrochemical industry uses SS 90° long radius elbow buttweld and reducers to manage fluid dynamics in complex piping networks. In the pharmaceutical sector, stainless fittings meet hygiene and purity standards required for cleanroom production. These fittings’ non-reactive and contamination-free qualities make them essential in the food and beverage industry. Stainless steel 304 and 316 buttweld fittings in nuclear power plants maintain their integrity even under extreme pressure and radiation. These are also preferred in shipbuilding and marine systems due to their ability to resist saltwater corrosion and mechanical wear.

Offshore Industry

Nuclear Industries

Refineries

Ship Building

Aerospace

Pharmaceutical

Global Export Destinations

Why Choose Midland Alloys Inc.?

Midland Alloys Inc. is a leading Indian manufacturer and exporter of high-quality ASME SA403 SS buttweld pipe fittings, delivering engineered products, that meet ASTM, ANSI and EN standards. We prioritize precision manufacturing and ISO-certified processes and offer full customization, including special end finishes, cut-to-lengths, surface treatments, and custom schedules. Through a strong supply chain, we cater to customers in the Gulf, Europe, Africa and Southeast Asia. Each fitting is subjected to strenuous in-house testing, supported by Mill Test Certificates (MTCs) and third-party inspection on demand. For small orders or bulk shipments, we guarantee quick delivery, comprehensive technical assistance, and reliable fulfillment. All fittings are marked per ASTM/ASME guidelines and certified to verify chemical and mechanical compliance, helping us build lasting partnerships based on trust, quality, and satisfaction.

FAQs – SS Buttweld Fittings

What is a buttweld fitting?

A buttweld fitting is a welded pipe component used to change direction, branch, or connect piping systems, offering a smooth, permanent, and leak-free joint.

What is the trick to welding stainless steel?

Control heat input and use proper filler metal to avoid warping or contamination; shielding gases like argon protect against oxidation during welding.

Is MIG or TIG better for stainless steel?

TIG welding is preferred for stainless steel due to its clean, precise welds, especially for thin sections and critical applications.

Products Categories

ISO Certificate

Nominal Pipe Size	Outside Diameter		90° Elbows		45° Elbows		180° Returns
(inches)			Long Radius	Short Radius	Long Radius		Long Radius
	(mm)	(inches)	Center to Face (inches)	Center to Face (inches)	Center to Face (inches)	Radius (inches)	Center to Center (inches)	Back to face (inches)
1/2	21.3	0.840	1 1/2	–	5/8		2	1 7/8
3/4	26.7	1.050	1 1/8	–	7/16		2 1/4	1 11/16
1	33.4	1.315	1 1/2	1	7/8		3	2 3/16
1 1/4	42.2	1.660	1 7/8	1 1/4	1		3 3/4	2 3/4
1 1/2	48.3	1.900	2 1/4	1 1/2	1 1/8	3	4 1/2	3 1/4
2	60.3	2.375	3	2	1 3/8	4	6	4 3/16
2 1/2	73.0	2.875	3 3/4	2 1/2	1 3/4	5	7 1/2	5 3/16
3	88.9	3.500	4 1/2	3	2	6	9	6 1/4
3 1/2	101.6	4.000	5 1/4	3 1/2	2 1/4	7	10 1/2	7 1/4
4	114.3	4.500	6	4	2 1/2	8	12	8 1/4
5	141.3	5.563	7 1/2	5	3 1/8	10	15	10 5/16
6	168.3	6.625	9	6	3 3/4	12	18	12 5/16
8	219.1	8.625	12	8	5	12	24	16 5/16
10	273.1	10.750	15	10	6 1/4	15	30	20 3/8
12	323.9	12.750	18	12	7 1/2	18	36	24 3/8

Pipe Elbow Nominal Size		Pipe Elbow Outside Diameter Y	Wall Thickness T (Pipe Elbow Schedule)		45 Deg. Elbow LR Centre to Face B	45 Deg. Elbow LR Weight	90 Deg. Elbow LR Centre to Face A	90 Deg. Elbow LR Weight	90 Deg. Elbow SR Centre to Face A	90 Deg. Elbow SR Weight
mm	in	mm	mm	Schedule	mm	kg	mm	kg	mm	kg
15	1/2”	21.3	2.78	STD	15.9	0.04	38.1	0.08	–	–
			3.73	X.S	15.9	0.05	38.1	0.10	–	–
20	3/4”	26.7	2.87	STD	11.1	0.04	28.6	0.08	–	–
			3.91	X.S	11.1	0.05	28.6	0.11	–	–
25	1”	33.4	3.38	STD	22.2	0.09	38.1	0.15	25.4	0.11
			4.55	X.S	22.2	0.11	38.1	0.19	25.4	0.14
32	11/4”	42.2	3.56	STD	25.4	0.14	47.6	0.28	31.75	0.18
			4.85	X.S	25.4	0.2	47.6	0.39	31.75	0.24
40	11/2”	48.3	3.68	STD	28.6	0.2	57.1	0.4	38.1	0.26
			5.08	X.S	28.6	0.25	57.1	0.5	38.1	0.35
50	2”	60.3	3.91	STD	34.9	0.36	76.2	0.72	50.8	0.5
			5.54	X.S	34.9	0.5	76.2	1.0	50.8	0.68
65	21/2”	73.0	5.16	STD	44.4	0.73	95.2	1.46	63.5	0.95
			7.01	X.S	44.4	0.91	95.2	1.82	63.5	1.27
80	3”	88.9	5.49	STD	50.8	1.1	114.3	2.18	76.2	1.45
			7.62	X.S	50.8	1.45	114.3	2.86	76.2	1.95
100	4”	114.3	6.02	STD	63.5	2.1	152.4	4.2	101.6	2.8
			8.56	X.S	63.5	2.9	152.4	5.7	101.6	3.9
125	5”	141.3	6.65	STD	79.4	3.4	190.0	6.8	127.0	4.8
			9.5	X.S	79.4	5.0	190.0	10.0	127.0	6.5
150	6”	168.3	7.11	STD	95.2	5.1	229.0	10.1	152.4	6.8
			10.97	X.S	95.2	7.7	229.0	15.3	152.4	10.2
200	8”	219.1	8.18	STD	127.0	10.2	305.0	20.4	203.0	13.6
			12.7	X.S	127.0	15.5	305.0	30.9	203.0	20.9
250	10”	273.9	9.27	STD	159.0	18.1	381.0	36.1	254.0	24.1
			12.7	X.S	159.0	24.4	381.0	48.8	254.0	32.5
300	12”	323.9	9.52	STD	190.0	26.6	457.0	53.1	305.0	35.4
			12.7	X.S	190.0	35.0	457.0	70.0	305.0	46.7
350	14”	355.6	9.52	STD	222.0	34.1	533.0	68.1	356.0	45.4
			12.7	X.S	222.0	45.0	533.0	90.0	356.0	60.0
400	16”	406.4	9.52	STD	254.0	45.0	610.0	89.3	406.0	59.5
			12.7	X.S	254.0	59.0	610.0	118.0	406.0	78.7
450	18”	457.0	9.52	STD	286.0	56.5	686.0	113.0	457.0	75.6
			12.7	X.S	286.0	75.0	686.0	150.0	457.0	100.0
500	20”	508.0	9.52	STD	318.0	85.0	762.0	140.0	508.0	93.5
			12.7	X.S	318.0	112.5	762.0	186.0	508.0	124.0
600	24”	610.00	9.52	STD	381.0	101.5	914.0	203.0	610.0	135.0
			12.7	X.S	381.0	134.5	914.0	269.0	610.0	179.0