Pipe Fittings · ASME B16.49 · project specs
Bend — ASME B16.49
Bend — a pipe bend with a larger radius than a standard elbow. Bends of 3D, 5D and larger radius give smoother flow than elbows and suit slurry, pigging and pipeline service. They are induction- or cold-bent from pipe.
- ASME B16.49
- 22 grades
- EN 10204 3.1 / 3.2
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
Bend: What to Know Before Ordering
- 3D, 5D and custom radius
- Induction or cold bending
- Tangent lengths to order
Bend Materials & Grades
| Grade | Material standard | Best for |
|---|---|---|
| Inconel 825 bend | ASTM B366 WPNICMC | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| SS 904L bend | ASTM A403 WP904L | Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water |
| SS 304 bend | ASTM A403 WP304 | General corrosion resistance, food, water and architectural work |
| SS 304L bend | ASTM A403 WP304L | Welded tanks, piping and vessels in general corrosive service |
| SS 310 / 310S bend | ASTM A403 WP310S | Furnaces, burners and heat treatment at high temperature |
| SS 316 / 316L bend | ASTM A403 WP316L | Chloride-bearing process fluids, marine air and pharmaceutical service |
| SS 321 bend | ASTM A403 WP321 | High-temperature service between 425 and 815 °C |
| SS 347 bend | ASTM A403 WP347 | Welded high-temperature piping in refineries and power plants |
| Duplex 2205 bend | ASTM A815 WPS31803 / WPS32205 | Strength with chloride resistance at a stainless-steel budget |
| Super Duplex 2507 bend | ASTM A815 WPS32750 | Seawater and high-chloride service where strength also matters |
| Inconel 600 bend | ASTM B366 WPNCI | High-temperature oxidation, caustic and nuclear service |
| Inconel 625 bend | ASTM B366 WPNCMC | Seawater, high strength and high temperature in one alloy |
| Inconel 718 bend | Machined from B637 on request | Very high strength at temperatures up to about 650 °C |
| Incoloy 800 / 800H / 800HT bend | ASTM B366 WPNIC | Furnaces, petrochemical heaters and high-temperature piping |
| Hastelloy C276 bend | ASTM B366 WPHC276 | The most aggressive mixed acids, wet chlorine and hypochlorite |
| Hastelloy C22 bend | ASTM B366 WPHC22 | Mixed oxidising and reducing acids, and weld overlays |
| Monel 400 bend | ASTM B366 WPNC | Seawater, hydrofluoric acid and marine service |
| Super Duplex S32760 bend | ASTM A815 WPS32760 | Seawater firewater, injection and offshore piping |
| ASTM A106 Gr B bend | ASTM A234 WPB | High-temperature process and steam piping in refineries and power plants |
| ASTM A333 Gr 6 bend | ASTM A420 WPL6 | Cold-climate and refrigerated piping down to −45 °C |
| ASTM A335 P11 bend | ASTM A234 WP11 | Steam and hot-oil piping up to about 550 °C |
| ASTM A335 P22 bend | ASTM A234 WP22 | High-pressure steam and hydrogen service up to about 580 °C |
Other pipe fittings
ElbowA fitting that changes the direction of a pipe run.TeeA fitting with a 90° branch that splits or combines flow.ReducerA fitting that joins two pipes of different sizes.CapA fitting that closes the end of a pipe.Stub endA short pipe length with a flared lap that works with a lap joint flange.CrossA four-way fitting with branches at 90°.LateralA fitting with a 45° branch.CouplingA short forged fitting that joins two pipes.UnionA three-piece forged fitting that joins pipes and can be taken apart.NippleA short length of pipe, threaded or plain, used to connect fittings.PlugA threaded fitting that closes a female connection.
Bend — questions buyers ask
Bend or elbow — what is the difference?
An elbow has a fixed 1D or 1.5D radius to ASME B16.9; a bend is bent from pipe to a larger radius, typically 3D or 5D.
Which grades are bends available in?
Inconel 825, SS 904L, SS 304, SS 304L, SS 310 / 310S, SS 316 / 316L, SS 321, SS 347, Duplex 2205, Super Duplex 2507, Inconel 600, Inconel 625, Inconel 718, Incoloy 800 / 800H / 800HT, Hastelloy C276, Hastelloy C22, Monel 400, Super Duplex S32760, ASTM A106 Gr B, ASTM A333 Gr 6, ASTM A335 P11, ASTM A335 P22.
Which standard covers bend dimensions?
ASME B16.49 · project specs. The material standard depends on the grade.
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