Butt welding steel pipe fittings are a type of steel pipe fittings with better quality made of welded pipes. They are widely used steel pipe fittings in the construction industry. They mainly include butt welding steel pipe fittings made of stainless steel, carbon steel, low alloy steel, and alloy steel. Compared with ordinary welded steel pipe fittings, butt welded steel pipe fittings are more durable and are not prone to deterioration due to the influence of external environmental conditions. Butt-welded steel pipe fittings play an indispensable role in construction projects and are the most popular applications for people. A relatively large number of welded pipe fitting products.


1. Classification
Commonly used butt welding steel pipe fittings are mainly divided into elbows, tees, reducers (big and small heads), and pipe caps. Among them, elbows, tees, and reducers are mostly made of seamless steel pipes or welded steel pipes, which are made by pushing and drawing. , extruded, and the pipe caps are mostly made of steel plate stamping.
Elbow: Elbows are divided into long-radius elbows and short-radius elbows according to different sizes; according to different manufacturing methods, they are divided into push elbows, extrusion elbows, and welded miter elbows.
Tee: According to different diameters, tees are divided into equal-diameter tees, reducing tees, and y-shaped tees.
Reducers: Reducers usually include concentric reducers and eccentric reducers.
Pipe caps: Pipe caps are usually divided into flat caps and standard oval caps. Among them, the flat cap is easier to manufacture and the price is lower, but its pressure-bearing capacity is not as good as the standard elliptical cap, so it is often used under the conditions of DN ≤ 100 and medium pressure below 1.0MPa. The standard elliptical pipe cap is an elliptical head with a folded edge. The ratio of the long and short axes of the inner diameter of the ellipse is 2:1. It is the most widely used head.


2. Commonly used standards
Commonly used standards for butt welding steel pipe fittings include: "Steel butt welding seamless steel pipe fittings" GB/T 12459-2005, "Steel plate butt welding steel pipe fittings" GB/T 13401-2005, "Steel butt welding steel pipe fittings for power stations" DL/T 695 —1999, SH 3408 steel butt welding seamless steel pipe fittings, SH 3409 steel plate butt welding steel pipe fittings, SH 3410 forged steel socket welding steel pipe fittings, HGJ514-87 carbon steel, low alloy steel seamless butt welding steel pipe fittings, ASME/ANSI B16 .9 Factory-made seamless steel pipe butt weld fittings, ASME/ANSI B16.11 socket weld and threaded forged fittings, ASME/ANSI B16.28 steel butt weld small radius elbows and return bends, ASME B16.5 pipe Flanges and Flange Fittings, MSS SP-43 Forged Stainless Steel Butt Weld Fittings, MSS SP-83 Socket Weld and Threaded Unions, MSS SP-97 Socket Weld, Threaded and Butt Weld Ends Integral Reinforced Pipe Holders, ASME B16.3-1998 Malleable cast iron threaded pipe.