Wrought carbon steel elbows, tees, reducers and caps with bevelled ends, welded directly into the pipe run. Dimensions to ASME B16.9 (NPS 1/2 to 48) or EN 10253-2, material to ASTM A234.
Prices on request. Contact us for availability and quotations.
Carbon steel butt-weld fittings are wrought elbows, tees, reducers and caps with bevelled ends, welded straight into the pipe run so the fitting bore matches the pipe bore. There is no crevice and no mechanical seal, so the fitting is as strong and as leak-tight as the pipe it joins, which is why butt-welding is the standard construction for pressure and process piping.
Dimensions come from ASME B16.9, which covers factory-made wrought buttwelding fittings in sizes NPS 1/2 through NPS 48 (DN 15 through DN 1200) and in any producible wall thickness, or from EN 10253-2 for non-alloy and ferritic alloy steels. Material for the ASME system is ASTM A234, whose grade WPB is the common carbon steel; A234 covers seamless and welded construction and specifically excludes cast welding fittings. A long-radius elbow has a centre-to-end dimension of 1,5 times the nominal size - 76 mm at NPS 2, 152 mm at NPS 4, 229 mm at NPS 6.
The fitting carries no pressure class of its own. ASME B16.9 rates it as straight seamless pipe of equivalent material and wall thickness under the applicable ASME B31 code, and the fitting is marked with the schedule number or nominal wall in millimetres, the grade and the size instead of a pressure rating. Conformance to the standard is certified by the prefix WP in the grade marking, which is why an A234 carbon fitting is ordered as A234 WPB.
When ordering, state the fitting type and angle; the nominal size, and both sizes for a reducing fitting; the pipe schedule or wall thickness to ASME B36.10M; the material specification and grade; whether seamless or welded construction is required; and whether an EN 10204 inspection document is needed. Carbon steel fittings have no corrosion allowance of their own - specify the coating or lining separately.
| Dimensional Standard (ASME system) | ASME B16.9 - factory-made wrought buttwelding fittings, NPS 1/2 through NPS 48 (DN 15 through DN 1200), any producible wall thickness |
|---|---|
| Dimensional Standard (EN system) | EN 10253-2 - butt-welding pipe fittings of non-alloy and ferritic alloy steels with specific inspection requirements |
| Material | ASTM A234, grade WPB for carbon steel - wrought fittings of seamless or welded construction for moderate and high temperature service. Cast welding fittings are excluded from A234 |
| Fitting Types | 45 and 90 degree elbows (long and short radius), returns, equal and reducing tees, concentric and eccentric reducers, caps, lap-joint stub ends |
| Long-Radius Elbow Geometry | Centre-to-end = 1,5 x nominal size: 38 mm at NPS 1, 76 mm at NPS 2, 114 mm at NPS 3, 152 mm at NPS 4, 229 mm at NPS 6, 305 mm at NPS 8 |
| Pressure Rating Basis | The fitting has no class of its own. It is rated as straight seamless pipe of equivalent material and wall thickness under the applicable ASME B31 code; schedule or wall thickness and material identity are marked on it in lieu of a pressure rating |
| Marking | Manufacturer's name or trademark, material grade, schedule number or nominal wall in mm, and NPS size. Conformance is certified by the prefix WP in the grade marking |
| Wall Thickness Reference | Ordered to a pipe schedule to ASME B36.10M |
| Types Shown in the Photograph | 90 degree long-radius elbows, 45 degree elbows, equal and reducing tees, and concentric and eccentric reducers, with a black protective coating |
