BW vs SW vs Screwed: Butt Weld (BW) fittings are butt-welded to pipe — for sizes ½″ and above, all pressure classes. Socket Weld (SW) fittings have a socket bore into which the pipe is inserted then fillet-welded — for high-pressure small-bore ≤ 3″. Screwed fittings thread onto the pipe end — no welding required, for low-pressure utility and instrumentation lines.
Home/Materials/Stainless Steel/Stainless Steel/SS Pipe Fittings
Stainless Steel Pipe Fittings
Butt Weld · Socket Weld · Screwed stainless steel pipe fittings in all grades and schedules — elbows, tees, reducers, caps, stub ends and more — EN10204 3.1 MTC from Mumbai stock.
BW · SW · Screwed Types
⅛″ to 48″ NB
SCH 5S to XXS
ASTM A403 / MSS SP-43
All SS & Duplex Grades
EN10204 3.1 MTC
⅛″–48″ NB
Size Range
6
Fitting Types
SCH 5S–XXS
Schedule
ASTM A403
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Grade, size & quantity — we respond within 2 hours.
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- Product Detail
Stainless Steel Pipe Fittings — BW, SW & Screwed | Supplier & Stockist in Mumbai
Bhilai Steel Industries supplies a comprehensive range of stainless steel pipe fittings — butt weld (BW), socket weld (SW) and screwed types — covering elbows, equal and reducing tees, concentric and eccentric reducers, caps, stub ends and crosses in all standard SS and Duplex grades.
All fittings are manufactured per ASTM A403 (BW), ASTM A182 (forged SW & screwed), and MSS SP-43 (lightweight BW) standards, with dimensional inspection and EN10204 3.1 MTC supplied as standard on every consignment.
Fitting Types
Stainless Steel Pipe Fitting Types — Descriptions & Use Cases
| Fitting Type | Description | Available As | Typical Application |
|---|---|---|---|
| Elbow 90° Short & Long Radius | Changes flow direction by 90°. LR (1.5D) is standard; SR (1D) for space-constrained layouts. | BW · SW · Screwed | Process piping direction changes, headers |
| Elbow 45° | Changes flow direction by 45°. Used where a less abrupt turn is needed. | BW · SW · Screwed | Slope changes in gravity-flow lines |
| Equal Tee | All three outlets same bore. Splits or combines flow in one direction. | BW · SW · Screwed | Branch connections — all equal size |
| Reducing Tee | One branch outlet smaller than run. Eliminates need for a reducer on the branch. | BW · SW | Branch take-offs at reduced bore |
| Concentric Reducer | Same centreline — for vertical pipes, pump suctions. | BW | Pump suctions, vertical runs |
| Eccentric Reducer | Flat bottom — for horizontal pipes, allows pigging, drains freely. | BW | Horizontal lines, pig-able lines, drainage |
| Cap | Closes the end of a pipe. Domed or flat end. | BW · SW · Screwed | Pipe end closures, hydrostatic test caps |
| Stub End Lap Joint End | Butt-welded to pipe; used with a Lap Joint flange — allows flange rotation for bolt alignment. | BW (Short Type A & Long Type B) | Bi-metallic joints, dismantlable piping |
| Cross (4-way) | Four-way fitting — one inlet, one outlet, two branches at 90°. | BW · SW · Screwed | 4-way junction headers |
Grade Reference
SS Pipe Fitting Grades & Standards
| ASTM Grade | UNS | Material | Standard |
|---|---|---|---|
| A403 WP304 / WP304L | S30400 / S30403 | SS 304 / 304L — BW fittings | ASTM A403 |
| A403 WP316 / WP316L | S31600 / S31603 | SS 316 / 316L — BW fittings | ASTM A403 |
| A403 WP321 / WP347 | S32100 / S34700 | SS 321 / 347 — BW fittings | ASTM A403 |
| A403 WP904L | N08904 | SS 904L — BW fittings | ASTM A403 / B366 |
| A815 WP-S31803 / WP-S32205 | S32205 | Duplex 2205 — BW fittings | ASTM A815 |
| A815 WP-S32750 | S32750 | Super Duplex 2507 — BW fittings | ASTM A815 |
| MSS SP-43 (Sch 5S / 10S) | All above | Lightweight BW fittings | MSS SP-43 |
| A182 F304L / F316L (SW & Screwed) | S30403 / S31603 | SS 304L / 316L forged fittings | ASME B16.11 |
Specifications
SS Pipe Fitting Specifications — Sizes, Schedules & Testing
- Dimensions & Standards
BW Size Range
½” NB to 48” NB
SW / Screwed
⅛” NB to 4” NB (Class 3000 / 6000 / 9000)
Schedule (BW)
SCH 5S · 10S · 10 · 40S · 40 · 80S · 80 · 120 · 160 · XXS
Wall Thickness
As per matching pipe schedule per ASME B36.19M
BW Standards
ASTM A403 · A815 (Duplex) · MSS SP-43 (lightweight)
SW/Screwed Std
ASME B16.11 · MSS SP-79 · MSS SP-83 · BS 3799
End Finish (BW)
Bevelled ends per ASME B16.25
Threads
NPT (ANSI B1.20.1) · BSPT · BSPP
- Testing & Certification
MTC
EN10204 3.1 standard · 3.2 on request
Dimensional
100% dimensional inspection per ASTM A403 / ASME B16.9
NDE
DP (Dye Penetrant) · PT on all fittings on request
PMI
Positive Material Identification per heat
Hardness
HV / HRC per ASTM A403 Table 2 (Duplex)
NACE
NACE MR0175 / ISO 15156 compliant on request
All fittings dispatched with individual heat number marking, ASTM marking per code, and plastic end caps. Export pallets available for overseas shipments.
End Uses
Applications of Stainless Steel Pipe Fittings
Process Piping
- Oil & gas process headers
- Refinery unit piping
- Petrochemical columns
- Reactor feed & product
Pharmaceutical
- High-purity BW elbows
- CIP/SIP returns
- Bioreactor connections
- Aseptic process piping
Food & Beverage
- Sanitary BW fittings
- Dairy process piping
- Brewery wort lines
- Hygienic fluid transfer
Marine & Offshore
- Topside process piping
- Seawater headers (SDX)
- Subsea tie-backs
- Chemical injection lines
Power Generation
- Steam headers
- Cooling water piping
- FGD scrubber lines
- Heat exchanger connections
Water Treatment
- Desalination headers
- RO unit connections
- Brine disposal lines
- Chemical dosing piping
Ordering
Documentation & How to Order SS Pipe Fittings
- Documentation Supplied
Mill TC
EN10204 3.1 (standard) · 3.2 on request
COA
Certificate of Analysis — chemical & mechanical test results
PMI
Positive Material Identification on request
3rd Party
SGS · BV · TUV inspection arranged on request
MSDS
Material Safety Data Sheet for export
- How to Order
- Share your grade, size and quantity or send your drawing
- State required standard (ASTM / EN / IS)
- Mention if 3.1 or 3.2 MTC is needed
- Specify any testing or inspection requirements
Response within 2 hours. Send via email, WhatsApp or the contact form below.
FAQs
SS Pipe Fittings — Frequently Asked Questions
What is the difference between LR (Long Radius) and SR (Short Radius) elbows?
A Long Radius (LR) elbow has a centreline radius of 1.5 × the nominal pipe diameter (1.5D). It offers lower pressure drop and is the standard for most piping. A Short Radius (SR) elbow has a 1D centreline radius — more compact, used where space is restricted, but causes higher pressure drop and turbulence. LR elbows are specified by default unless SR is explicitly called out on the isometric.
Are SS 316L fittings interchangeable with SS 304 in dimension and schedule?
Yes — SS 316L and SS 304 butt weld fittings share identical dimensions per ASME B16.9 for any given nominal size and schedule. They are dimensionally interchangeable but not metallurgically — ensure the grade matches the pipe material and service requirement.
Do you supply Duplex 2205 BW fittings with PWHT documentation?
Duplex 2205 fittings (ASTM A815 WP-S32205) are supplied in the solution-annealed condition as required — no PWHT after welding is typically required for Duplex. We supply with ferrite content report and hardness test certificate in addition to EN10204 3.1 MTC.