Zhejiang 20 # carbon steel elbow

Elbows are fittings that change the direction of pipelines in piping systems. The commonly used elbows in fluid pipeline engineering construction are 45 °, 90 °, and 180 °, and other non-standard elbows such as 60 ° can be customized according to project needs. Zhejiang 20 # carbon steel elbow is a commonly used pipe fitting widely used in basic engineering such as chemical, construction, water supply, drainage, petroleum, light and heavy industries, refrigeration, sanitation, plumbing, fire protection, power, aerospace, shipbuilding, etc.

The ways of connecting elbows include direct butt welding, flange connection, threaded connection, and socket connection. The production process of elbows can be divided into: welded elbows, stamped elbows, push made elbows, cast elbows, etc.

⑴. Elbows are classified by material into carbon steel, stainless steel, alloy steel, special alloy steel, duplex stainless steel, etc; Carbon steel: (20 #, A3, Q235, Q235A, Q235B, 20G, 16Mn, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, 00Cr17Ni14Mo2, 1Cr18Ni9Ti, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2, etc.); Alloy steel: (16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910, 15CrMo, 12Cr2Mo1, A335P22, St45.8/III, A10bB, etc.); Special alloy steel: (TP310S, 904L, Incoloy800, Incoloy825, Incoloy600, Incoloy625, etc.); Dual phase stainless steel: (F51, S31803, S2205, F53, 2507, S32750, F55, 2607, S32760, etc.).

⑵. According to the production method, it can be divided into pushing, pressing, forging, casting, etc.

⑶. According to manufacturing standards, it can be divided into national standards, electrical standards, ship standards, chemical standards, water standards, American standards, German standards, Japanese standards, Russian standards, etc.

⑷. According to its curvature radius, it can be divided into long radius elbows and short radius elbows. A long radius elbow refers to a pipe with a curvature radius equal to 1.5 times the outer diameter of the pipe, i.e. R=1.5D. A short radius elbow refers to a curvature radius equal to the outer diameter of the pipe, i.e. R=1.0D. (D is the diameter of the elbow, R is the radius of curvature).

⑸. If classified by pressure level: there are approximately seventeen types, which are the same as the pipe standards in the United States, including: Sch5s、Sch10s、Sch10、Sch20、Sch30、Sch40s、STD、Sch40、Sch60、Sch80s、XS; Sch80、SCH100、Sch120、Sch140、Sch160、XXS; The most commonly used ones are STD and XS.

⑹. According to different shapes and purposes, it can be divided into groove elbows, sleeve elbows, double socket elbows, flange elbows, reducing elbows, fixed seat elbows, internal and external tooth elbows, stamped elbows, push elbows, socket elbows, butt welded elbows, internal wire elbows, etc.

Chinese Pipe Fitting Manufacturing Standards:

GB/T12459-2017 Steel butt welded seamless fittings

GB/T13401-2017 Steel plate welded pipe fittings

SH/T3408-2012 Steel butt welded seamless pipe fittings

SH/T3409-1996 Steel plate butt welded pipe fittings

SH/T3410-2012 Forged steel socket welded pipe fittings

GB/T10752-1995 Marine steel pipe butt welded joints

Flexible interface cast iron pipes and fittings for drainage

American Pipe Fitting Manufacturing Standards:

ASME/ANSI B16.9 factory manufactured seamless steel pipe fittings for butt welding

ASME/ANSI B16.11 socket welded and threaded forged fittings

ASME/ANSI B16.28 Steel butt welded small radius elbows and return bends

ASME/ANSI B16.5 pipe flanges and flange fittings

MSS SP-43 forged stainless steel butt welded pipe fittings

MSS SP-83 socket weld and threaded union

MSS SP-97 integral reinforced socket, threaded and butt welded ends