Buttweld Fittings
What are Buttweld Fittings?
Buttweld Fittings are pipe connectors used to alter the direction, branch, or diameter of piping systems through a welded joint. Unlike threaded or socket weld fittings, buttweld fittings are welded directly to pipes, offering a strong, permanent, and leak-proof connection suitable for high-pressure and high-temperature applications.
These fittings are widely used in oil & gas, petrochemical, power generation, water treatment, and food processing industries due to their durability, dimensional accuracy, and smooth flow characteristics. Buttweld fittings are available in a wide range of shapes and sizes, including elbows, tees, reducers, caps, and crosses, and are manufactured from carbon steel, stainless steel, alloy steel, and duplex grades.
Key Features
- Strong Welded Joints – Provide excellent strength and pressure resistance.
- Radius Options – Available in long radius (LR) and short radius (SR) types.
- Smooth Interior – Minimizes pressure loss and flow turbulence.
- Standards Compliant – Meets ANSI/ASME, MSS-SP, DIN, and EN specifications.
- Welding Compatible – Suited for automated welding in large-scale projects.
Types of Buttweld Fittings
- Elbow
- Tee
- Reducer
- Cross
- Cap
- Long Stub End
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Details |
|---|---|
| Sizes | ½" to 48" (DN15 – DN1200) |
| Wall Thickness | SCH 10 to SCH XXS (as per ANSI B36.10/B36.19) |
| Pressure Ratings | As per pipe schedule |
| Material Options | Carbon Steel, SS 304/316, Alloy Steel, Duplex |
| Standards | ASME B16.9, MSS-SP-43, DIN 2605/2615/2616 |
| Manufacturing | Seamless / Welded / Hot Formed / Cold Formed |
| Property | Typical Value |
|---|---|
| Tensile Strength | 485 – 750 MPa |
| Yield Strength | 205 – 450 MPa |
| Elongation | ≥ 20% |
| Hardness | 120 – 250 HB |
| Operating Temp Range | -46°C to +650°C (material-based) |
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 – 0.35 |
| Manganese (Mn) | 0.60 – 1.65 |
| Silicon (Si) | 0.15 – 0.80 |
| Chromium (Cr) | 16.0 – 20.0 |
| Nickel (Ni) | 8.0 – 14.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
| Standard | Equivalent Grades |
|---|---|
| ASTM | A234 WPB (CS), A403 WP304/316 (SS) |
| ASME | B16.9, B16.28 |
| MSS-SP | SP-43, SP-75 |
| DIN | 2605, 2615, 2616, 2617 |
| ISO | ISO 3419, ISO 5251 |
| Fitting Type | Size (inches) | Weight per 100 pcs (kg) |
|---|---|---|
| 90° Elbow (LR) | 2" | 125 |
| Tee | 4" | 210 |
| Concentric Reducer | 6" x 4" | 180 |
| Cap | 3" | 95 |
| Stub End | 2" | 65 |
Applications of Buttweld Fittings
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
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