Leading Buttweld Fittings Manufacturer in India – In-Depth Guide to Types, Materials & Industrial Applications
What Are Buttweld Fittings?
Buttweld fittings are weldable pipe fittings designed to be permanently welded to a piping system. They are commonly used in high-pressure applications due to their strength, leak-proof nature, and minimal pressure drop across the connection. These fittings include elbows, tees, reducers, caps, and more, all conforming to standard dimensions and specifications like ASME B16.9 and MSS-SP-75.
Buttweld fittings offer superior mechanical strength, better flow characteristics, and ensure continuity of the pipe system due to their smooth inner surface. They’re ideal for use in oil & gas, chemical, power, and process industries.
a. Buttweld Elbows
Used to change the direction of flow.
- 90° Elbow (LR & SR) – Long Radius (1.5D) or Short Radius (1D)
- 45° Elbow – Creates a gentle directional change
- 180° Return Bends – Used in U-shaped piping arrangements
c. Buttweld Reducers
Change the pipe size gradually.
- Concentric Reducer – Keeps the centerline aligned
- Eccentric Reducer – Used when top or bottom pipe alignment is critical
b. Buttweld Tees
Used to create a branch line from the main pipe.
- Equal Tee – All three sides have the same diameter
- Reducing Tee – Branch has a smaller diameter than the run
d. Buttweld Caps
Used to close pipe ends or isolate lines temporarily/permanently.
e. Crosses, Stub Ends, Nipples
Used in special assemblies and complex routing or flange joint requirements.
a. Carbon Steel
Grades: ASTM A234 WPB/WPC, A420 WPL6
Used in industrial services where corrosion resistance is not a primary concern but pressure and temperature handling are critical.
b. Stainless Steel
Grades: 304/L, 316/L, 321, 347, 310, 904L
Highly corrosion-resistant, ideal for chemical, dairy, and food-grade environments.
c. Alloy Steel
Grades: ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91
Used in high-temperature services like boilers and heat exchangers.
d. Nickel Alloys
Inconel, Monel, Hastelloy, Alloy 20
Extremely corrosion- and heat-resistant, ideal for offshore, marine, and critical process environments.
e. Duplex & Super Duplex Stainless Steel
Grades: UNS S31803, S32750
Excellent mechanical properties and pitting resistance. Used in desalination plants, oil rigs, and coastal refineries.
- ASME B16.9 – Factory-made wrought buttweld fittings
- MSS-SP-43 – For stainless steel fittings for low-pressure use
- ASTM A403 / A234 / A815 / B366 – Covers material requirements
- Size Range – From ½” NB to 72” NB
- Wall Thickness – SCH 5S, 10S, 40, 80, 160, STD, XS, XXS
- NACE MR0175 – Compliance for sour service
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- Seamless flow path (no turbulence)
- Stronger, leak-proof joints
- Suitable for large bore pipelines
- Reduced pipe stress due to gradual changes in direction or diameter
- Lower cost per unit in long-run projects
- Easy to radiograph and inspect weld quality
- Ensure pipe and fitting bevels align correctly
- Use matching filler metals (E7018 for CS, ER316L for SS)
- Maintain 1.5–2 mm root gap
- Preheat carbon steel to avoid HAZ cracks
- Use back purging for stainless and alloy steels
- Conduct 100% radiographic testing for critical welds
- Post-weld heat treatment (PWHT) may be required for alloy steels
- Material Test Certificates (MTC) per EN 10204 3.1/3.2
- Third-Party Inspection (TPI) – SGS, BV, TUV
- NDT Reports – RT, UT, PT, MT
- Hydro Test Reports
- IBR (India), PED (EU), ISO 9001 compliant manufacturing
Before ordering, make sure to define:
- Pipe Size (OD/NB) and Schedule (Sch 40/80/160 etc.)
- Material grade and standard (e.g. ASTM A234 WPB)
- Type and angle (90° LR Elbow, Reducer, Tee)
- Quantity and End Connection (Beveled, Plain)
- Compliance needs (NACE, IBR, ISO)
- Surface finish or special requirements (e.g. pickled, passivated)
If you’re looking for precision-engineered buttweld fittings backed by certifications, expert guidance, and competitive pricing — you’re in the right place.
Contact us today to get:
- Technical support for material & size selection
- Bulk supply capabilities for large projects
- Compliance with IBR, NACE, PED, and more
- Fast dispatch and quality assurance
| Material | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| Carbon Steel (WPB) | 485 | 240 | 22 |
| Stainless 316L | 485 | 170 | 40 |
| Alloy Steel (WP22) | 620 | 415 | 20 |
| Inconel 625 | 827 | 414 | 30 |
a. Oil & Gas
Used in upstream, midstream, and downstream operations for high-pressure fluid transfer and corrosion resistance.
b. Power Plants
Used in superheated steam lines, feedwater systems, and condensate return due to high-temperature endurance.
c. Chemical & Petrochemical
Resistant to acidic and hazardous chemicals. Stainless steel and nickel alloys are commonly used.
d. Marine & Offshore
Nickel alloys and duplex stainless steel resist saltwater corrosion.
e. Pharmaceutical & Food Processing
Sanitary-grade fittings with electro-polished finishes.
| Feature | Buttweld | Socket Weld | Screwed/Threaded |
| Pressure Capacity | High | Moderate | Low |
| Size Range | ½” – 72” | Up to 2” | Up to 4” |
| Strength & Durability | Excellent | Good | Poor (leak-prone) |
| Maintenance Requirement | Low | Medium | High |
| Applications | Industrial, Critical | General Pipeworks | Temporary/low-cost use |
a. Hot Forming
A seamless pipe or plate is heated and molded using dies and hammers. It is then heat treated to restore mechanical strength.
b. Cold Forming
For small diameter fittings where precise tolerances and surface finish are required.
c. Beveling and Machining
Ends are prepared for welding with a 37.5° bevel and 1.6 mm root face.
d. Heat Treatment
Normalization, annealing, quenching, or tempering is applied based on material standards.
e. Testing
- Visual inspection
- Radiography (RT)
- Ultrasonic (UT)
- Hydrostatic testing
- PMI (Positive Material Identification)
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