What is 90° Long Radius Elbow?
ASTM SA / A403 SA / A 774 WP-S 90° Long Radius Elbow is a common pipe fitting widely used in various fluid piping systems. Its primary function is to enable a 90-degree directional change in pipelines while ensuring smooth fluid flow.
A long radius elbow typically refers to an elbow with a bending radius equal to or greater than 1.5 times the pipe diameter. This design helps reduce fluid resistance during directional changes, thereby improving the efficiency of the piping system.
Specification
| Material | Stainless Steel ASME / ASTM SA / A403 SA / A 774 WP-S, WP-W, WP-WX, 304, 304L, 316, 316L, 304/304L, 316/316L, DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404 |
| Dimension | ANSI B16.9, ANSI B16.28, MSS-SP-43 Type A, MSS-SP-43 Type B, JIS B2312, JIS B2313 |
| Thickness | Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS and etc. |
| Size | 1/2 inch–48 inch (For larger pipe fittings, customized design and manufacturing are usually required) |
Manufacturing Process
The mainstream production method for custom stainless steel 90° elbows is hot push forming:
Cutting:
Stainless steel pipe blanks are cut to calculated lengths.
Heating:
The pipe blank is locally heated to plastic forming temperature (above 1000°C) using an medium-frequency induction heating furnace.
Pushing:
On a hydraulic push machine, the heated blank is formed into a 90° shape using specially designed bending dies and mandrels. This process ensures uniform wall thickness and excellent streamline flow.
Heat Treatment:
For stainless steel, solution annealing is critical. The elbow is reheated to 1050-1100°C and rapidly cooled to eliminate internal stress and restore corrosion resistance.
Post-Processing:
End beveling, dimensional inspection, surface treatment (e.g., pickling passivation, polishing), and final quality checks are performed.
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