Steel Elbows are one of the most commonly used pipe fittings in pipeline systems, with varying manufacturing processes and applications. Among them, seamless elbows are the most prevalent type, further categorized into long-radius (LR) and short-radius (SR) elbows, with the former being more widely used.
In terms of specifications, small- and medium-sized seamless elbows are most commonly used, while larger sizes typically employ steel plate butt-welded elbows.
Steel bends can be classified based on their R-value (radius), which typically starts at 3D and can be customized to meet operational requirements-ranging from 3D, 3.2D up to 4D, 5D, 6D, 8D, or even larger, without any production quantity restrictions.
Additionally, bend angle serves as another key distinguishing factor. Whether 11.5°, 22.5°, 45°, 60°, 90°, 135°, 180°, 270°, or 360°, these angles can be tailored to specific needs without limitations.
Furthermore, steel bends can be seamless or welded. Smaller-diameter bends are usually seamless, while larger-diameter ones may use welded processes, such as spiral welding.
Finally, manufacturing processes are another critical classification criteria. Common production methods include:
CNC bending
seamless push bending
induction hot bending
Specification
Manufacturing standard: AISI B16.49, MSS-SP-75
Material: Carbon steel, Alloy steel, Stainless steel
Material standards: API 5L Grade B, X42, X46, X52, X56, X60, X65, X70, X80 PSL1 & PSL2 & SOUR; ASTM A234 WPB, WPC, WP1, WP5, WP9, WP11, WP22, WP91; ASTM A403 304/304L, 316/316L.
Outer Diameters: 1/2'' to 60''. DN15 to DN1500
Radius range: R=2D, 2.5D, 3D bend, 5D bend, 6D, 8D bend
Degree range: 45 degree, 60 degree, 90 degree and customized.
Wall thickness: SCH 10, SCH 40, SCH80
Coatings: Black paint, galvanized, epoxy coated, 3PE, FBE
