Stainless Steel
Fittings for corrosive, hygienic and low temperature process lines.
Product Overview
Buttweld Fittings Stockist and Supplier
Our buttweld pipe fittings cover the full range of elbows, tees, reducers, return bends, stub ends, caps, collars, crosses and inserts for welded piping systems.
Fittings are available in seamless and welded construction in stainless steel, carbon steel, alloy steel, nickel alloys and copper alloys, with IBR and non-IBR supply for steam service.
- Sizes from 1/8" NB to 48" NB
- Seamless and welded construction
- Wall thickness Sch 5S to Sch XXS
- IBR and non-IBR supply
Size1/8" to 48" NB
WallSch 5S to XXS
TypeSeamless & Welded
ServiceIBR & Non-IBR
Buttweld Fittings Specifications
- Stainless Steel
- ASTM A403 WP / WPW
- Carbon Steel
- ASTM A234 WPB / WPBW (IBR and Non-IBR)
- Alloy Steel
- ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91 (IBR and Non-IBR)
- Nickel Alloys
- Monel 400 and K500, Inconel 600 and 625, Incoloy 800 and 825, Hastelloy, Alloy 904L
- Copper Alloys
- Aluminium, Copper, Brass and Gunmetal
- Types
- Elbow, Tee, Reducer, Return Bend, Stub End, Cap, Collar, Cross, Insert, Bushing, Pipe Plug, Nipple, Dairy Bend
- Size
- 1/8" NB to 48" NB, seamless and welded
- Wall Thickness
- Sch 5S to Sch XXS
- Dimensional Standard
- ASME B16.9, MSS SP-43
Buttweld Fittings Grades
Stainless Steel
- WP 304
- WP 304L
- WP 304H
- WP 316
- WP 316L
- WP 316Ti
- WP 310
- WP 310S
- WP 321
- WP 321H
- WP 317
- WP 347
- WP 347H
Carbon Steel
- WPB
- WPBW
Alloy Steel
- WP1
- WP5
- WP9
- WP11
- WP22
- WP91
Nickel Alloys
- Monel 400
- Monel K500
- Inconel 600
- Inconel 625
- Incoloy 800
- Incoloy 825
- Hastelloy
- Alloy 904L
Materials
Carbon Steel
Wrought fittings for moderate and high temperature service.
Alloy Steel
Chrome-moly fittings for steam and high temperature lines.
Nickel Alloys
Monel, Inconel, Incoloy and Hastelloy fittings for severe service.
Copper Alloys
Aluminium, copper, brass and gunmetal fittings for marine and utility lines.
Chemical Composition
Swipe to see all columns
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | Others |
|---|---|---|---|---|---|---|---|---|---|
| Stainless Steel, ASTM A403 | |||||||||
| WP 304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 - 20.0 | 8.0 - 11.0 | - | - |
| WP 304L | 0.030 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 - 20.0 | 8.0 - 12.0 | - | - |
| WP 316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | - |
| WP 316L | 0.030 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | - |
| WP 321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0 - 19.0 | 9.0 - 12.0 | - | Ti 5 x (C + N) min, 0.70 max |
| WP 347 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0 - 19.0 | 9.0 - 13.0 | - | Nb 10 x C min, 1.10 max |
| Carbon Steel, ASTM A234 | |||||||||
| WPB | 0.30 | 0.29 - 1.06 | 0.050 | 0.058 | 0.10 min | 0.40 | 0.40 | 0.15 | Cu 0.40, V 0.08 |
| Alloy Steel, ASTM A234 | |||||||||
| WP5 | 0.15 | 0.30 - 0.60 | 0.040 | 0.030 | 0.50 | 4.00 - 6.00 | - | 0.44 - 0.65 | - |
| WP9 | 0.15 | 0.30 - 0.60 | 0.030 | 0.030 | 1.00 | 8.00 - 10.00 | - | 0.90 - 1.10 | - |
| WP11 | 0.05 - 0.15 | 0.30 - 0.60 | 0.030 | 0.030 | 0.50 - 1.00 | 1.00 - 1.50 | - | 0.44 - 0.65 | - |
| WP22 | 0.05 - 0.15 | 0.30 - 0.60 | 0.040 | 0.040 | 0.50 | 1.90 - 2.60 | - | 0.87 - 1.13 | - |
| WP91 | 0.08 - 0.12 | 0.30 - 0.60 | 0.020 | 0.010 | 0.20 - 0.50 | 8.00 - 9.50 | 0.40 | 0.85 - 1.05 | V 0.18 - 0.25, Nb 0.06 - 0.10, N 0.03 - 0.07 |
Values are for reference, as per the relevant standard. Percentages are maximum unless a range or minimum is shown. Actual values are stated on the mill test certificate.
Mechanical Properties
| Grade | Tensile (MPa, min) | Yield (MPa, min) | Elongation (%, min) |
|---|---|---|---|
| Stainless Steel, ASTM A403 | |||
| WP 304 | 515 | 205 | 28 |
| WP 304L | 485 | 170 | 28 |
| WP 316 | 515 | 205 | 28 |
| WP 316L | 485 | 170 | 28 |
| WP 321 | 515 | 205 | 28 |
| WP 347 | 515 | 205 | 28 |
| Carbon Steel, ASTM A234 | |||
| WPB | 415 | 240 | 22 |
| Alloy Steel, ASTM A234 | |||
| WP5 | 415 | 205 | 22 |
| WP9 | 415 | 205 | 22 |
| WP11 | 415 | 205 | 22 |
| WP22 | 415 | 205 | 22 |
| WP91 | 585 | 415 | 20 |
Elongation values are longitudinal. Alloy grades are shown for Class 1.
Dimension Chart
Buttweld Fitting Dimensions (mm), ASME B16.9
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| NPS (in) | OD | 90 deg LR Elbow (A) | 45 deg LR Elbow (B) | Tee (C / M) | Reducer (H) | Cap (E) |
|---|---|---|---|---|---|---|
| 1/2 | 21.3 | 38 | 16 | 25 | - | 25 |
| 3/4 | 26.7 | 38 | 19 | 29 | 38 | 25 |
| 1 | 33.4 | 38 | 22 | 38 | 51 | 38 |
| 1 1/4 | 42.2 | 48 | 25 | 48 | 51 | 38 |
| 1 1/2 | 48.3 | 57 | 29 | 57 | 64 | 38 |
| 2 | 60.3 | 76 | 35 | 64 | 76 | 38 |
| 2 1/2 | 73.0 | 95 | 44 | 76 | 89 | 38 |
| 3 | 88.9 | 114 | 51 | 86 | 89 | 51 |
| 3 1/2 | 101.6 | 133 | 57 | 95 | 102 | 64 |
| 4 | 114.3 | 152 | 64 | 105 | 102 | 64 |
| 5 | 141.3 | 190 | 79 | 124 | 127 | 76 |
| 6 | 168.3 | 229 | 95 | 143 | 140 | 89 |
| 8 | 219.1 | 305 | 127 | 178 | 152 | 102 |
| 10 | 273.1 | 381 | 159 | 216 | 178 | 127 |
| 12 | 323.9 | 457 | 190 | 254 | 203 | 152 |
| 14 | 355.6 | 533 | 222 | 279 | 330 | 165 |
| 16 | 406.4 | 610 | 254 | 305 | 356 | 178 |
| 18 | 457.0 | 686 | 286 | 343 | 381 | 203 |
| 20 | 508.0 | 762 | 318 | 381 | 508 | 229 |
| 24 | 610.0 | 914 | 381 | 432 | 508 | 267 |
Centre to end and end to end dimensions. Cap length E applies up to the standard limiting wall thickness.
Applications
Oil & Gas
Direction changes and branch connections in process piping.
Chemical Processing
Corrosion resistant fittings for chemical and fertilizer plants.
Power Plants
High temperature steam and feedwater systems.
Water Treatment
Treatment and pumping station pipework.
MEP & HVAC
Chilled water and fire protection headers.
Manufacturing
Skids, fabrication shops and process equipment.
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