According to the standard production can be transformed into:

Material：

Carbon steel: ASTM/ASME A234 WPB, WPC

Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV

Stainless steel : ASTM/ASME A403 WP 304-304L-304H-304LN-304N ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H

Cryogenic steel : ASTM/ASME A402 WPL3-WPL 6

High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70

Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon-chromium leaching, PVC, PPR, RFPP(reinforced polypropylene), etc.

The production method can be divided into: pushing, pressing, forging, casting, etc.

According to the manufacturing standards, it can be divided into: national standard, electric standard, ship standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc.

According to its curvature radius to divide: can be divided into long radius elbow and short radius elbow. Long radius elbow refers to its radius of curvature is equal to 1.5 times the outer diameter of the pipe, namely R=1.5D; A short radius elbow has a radius of curvature equal to the outer diameter of the pipe, i.e., R=1.0D. (D is elbow diameter, R is curvature radius).

According to the pressure level, there are about 17 kinds of pipe standards, which are the same as those of the United States, such as Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; The two most commonly used are STD and XS.

According to different shapes, it can be divided into: groove elbow, clamp sleeve elbow, double bearing elbow, flange elbow, reduced diameter elbow, inside and outside elbow, punching elbow, push elbow, socket elbow, butt welding elbow, inner wire elbow, etc.

The conventional classification：

In a torsion Angle, Angle of cutting sleeve type has the edge Angle, fast loading of bend and arrange ushering elbow, flange, elbow, 180 ° bend, double elbow, ChanCheng elbow, socket bend, reducing elbow, seamless elbow, butt welding elbow 45 °, 90 ° elbow, elbow combination tee female elbow, stamping elbow, elbow push system, high pressure Angle Wear-resisting bend, mechanical elbow , flange elbow, groove elbow, three-dimensional elbow, external thread elbow, thread elbow, special elbow, waterproof elbow.

Japanese standards：

JIS B2311 Universal steel butt welded pipe fittings

JIS B2312 Steel butt welded pipe fittings

JIS B2313 Welded pipe fittings made of steel plate

JIS B2316 Steel socket welded pipe fittings

American Standard for pipe fitting execution standard:

ASME/ANSI B16.9 factory made wrought steel butt welded pipe fittings

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

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

ASME B16.5 Pipe flanges and flange fittings

MSS SP-43 forged stainless steel butt welded pipe fittings

MSS SP-79 socket welding reducer insert

MSS SP-83 socket welding and threaded connector

MSS SP-97 socket, thread and butt weld end integral reinforcement

Electric power standard：

GB2000 Thermal power plant soda pipe parts and components typical design manual

DL/T515-93 power station bend

D-GD87-1101 Typical design of pipe parts and components

Chemical standard for pipe fitting execution standard:

HGJ514 carbon steel, low alloy steel seamless butt welding pipe fittings

HGJ528 steel seam butt welded pipe fitting

HGJ10 forged steel socket welding pipe fitting

HGJ529 forged steel socket welding, thread and butt welding pipe

HGJ-44-76-91 steel pipe flanges, gaskets and fasteners

HG20592-20635 steel pipe flange, gasket, fastener

Sinopec standard：

SH3406 -1996 Steel pipe flanges for petrochemical industry

SH3408-1996 steel butt welded seamless fittings

SH3409-1996 wrought steel socket welded pipe fittings

SH3410-1996 Wrought steel socket welded pipe fittings

SH3065-1994 Technical standard for sharp bending pipe of petrochemical tubular furnaces

National standard:

GB/T12459-2017 steel butt welded pipe fittings

GB/T14383 forged steel socket welding pipe fittings

GB/T17185-1995 steel flange fittings

Among the pipe fitting implementation standards, petroleum standards:

SY/T0510-2017 steel butt welded pipe fittings

SY/T5257-2012 Steel bend

02S403 National Building Standard for Steel pipe Fittings

Marine standard：

GB/T10752-1995 Marine steel pipe butt welding joint

CB/T3590-94 Aluminum brass elbow