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90 DEG 4D Bend API A53B

90 deg 4D bend is belongs to butt welded fittings.4D means the radius of the bend is 4 times long the dimension of the pipe bend.API A53B is a great of carbon steel materical for pipes and bends in American Standard.

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What is 90 DEG 4D bend?

90 DEG 4D bend mains steel pipe bend two pipes into 90 degree angle and connects them together to change the direction of the pipe,4D represents the bend radius is 4 times the diameter.API A53B is a commonly used grade of American standard of carbon steel .


Product features

  • Since there is no irregular surface inside the pipe and the fluid does not have to change direction suddenly, the flow of bend is usually smoother.
  • They can be almost any bending radius and angle.
  • Pipe bends are commonly produced on site to meet a specific need by hot induction bending or cold bending.


Pipe Bend VS Elbow


  • Bending Radius of Bend and Elbow

Bending Radius of  Bend and Elbow

Steel pipe bend radius: Above 2 times of D, so there are 2D, 2.5D, 3D, 5D, 6D, 7D or 8D pipe bend.

Steel pipe elbow radius: R=1D or R=1.5D or 2D. Below 1.5D is short radius elbow, and more than 1.5D but not over 2D is long radius elbow.


  • Different of manufacturing processes

Bend: Could be bend directly from a finished pipe with cold bending processes, to different degrees.

Elbow: Shall be made according by standard manufacture procedures, with hot finishing or hot bending, to a certain degree, 45°, 90° or 180°.



  • Automotive
  • industry
  • medical equipment,
  • solar panel frame
  • industrial equipment and wires



Shape Elbow, Tee, Cross, Bend, Reducer, Cap, Stub End
Size Range 1/2″ – 80″ / DN15 – 2000
Thickness Schedule SCH 10,SCH 10S, SCH 20, SCH 40,SCH 40S, STD, XS,SCH 80, SCH 80S, SCH 100, SCH 120, SCH 160, XXS
China Standard GB/T12459, GB/T13401, HG/T21635/21631, SH3408/3409
America Standard ANSI / ASME B16.9 / MSS SP 43
apan Standard JIS B2311/2312/2313
Europe Standard EN10253
Carbon Steel Q235, 20#, 35#, 45#, 20G,ASTM A234 WPB/WPC
Low Temp Carbon Steel Q345B, 16Mn, ASTM A420 WPL6
Pipeline Steel ASTM A860 WPHY 42 / 46 / 56 / 60 / 65
Alloy Steel ASTM A234 WP11 / WP12 / WP 5 / WP9 / WP91 / WP92,15CrMoG, 12Cr1MoVG, 12Cr5Mo, 1Cr5Mo, Cr9Mo, 10CrMo910, 12CrMo4-5
Stainless Steel ASTM A403 WP304/304L/304H, 316/316L, 310S, 321, 317,347,904L
Duplex Stainless Steel ASTM A815 S32205, S31803, 32750, 32760



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