JIS G3466 outlines the standards for square steel pipes, which are utilized in structural applications including civil engineering and construction projects.

Specifications for STKR 400 and STKR 490 Pipes

Pipe Grades:

  1. STKR 400
  2. STKR 490

Dimensions:

Square Pipes:Size Range: 40x40mm to 350x350mm

Rectangular Pipes:Size Range: 20x50mm to 200x400mm

Wall Thickness:Range: 1.6mm to 12mm

Standards:

  1. ASTM A500 Grades A/B/C/D
  2. EN 10219-1
  3. EN 10210-1 (S275JRH, S355J0H)

JIS G3466 STKR400 STKR490 Carbon Steel Square and Rectangular Pipes Chemical Composition:

Chemical Composition %
Steel GradeCSiMnPS
STKR 4000.25 max.--0.040 max.0.040 max.
STKR 4900.18 max.0.55 max.1.50 max.0.040 max.0.040 max.

JIS G3466 STKR400 STKR490 Carbon Steel Square and Rectangular Pipes Mechanical Property:

Steel GradeTensile strengthYield StrengthElongation A
MPaMPa%
STKR 400400 {41} min.245 {25} min.23 min.
STKR 490490 {50} min.325 {33} min.23 min.

Production Method:

The production of square steel pipes involves several methods, outlined as follows:

a) Forming Processes:

  1. Square steel pipes are created by forming welded steel pipes using electric resistance welding, forge welding, or automatic arc welding.
  2. They can also be produced from seamless steel pipes shaped into square forms, or by forming steel strips into square or paired channel cross-sections.
  3. Continuous electric resistance welding or automatic arc welding is used for manufacturing these shapes.

b) Heat Treatment:Square steel pipes are generally produced as-is and typically do not undergo heat treatment.

c) Galvanized Steel Option:

  1. Upon customer request, square steel pipes can be made from galvanized steel sheets or strips.
  2. When using plated steel sheets or strips, it is recommended to use the type of plating and coating weight specified in Annex A.

d) Pipe Ends:

  1. The default configuration for pipe ends is plain ends unless specified otherwise.
  2. If bevel ends are required, the shape should be determined by mutual agreement between the buyer and the supplier.

As a leading carbon pipe manufacturer and factory, CG Steel offers JIS G3466 Square and Rectangular Pipes in grades STKR 400 and STKR 490. Contact us today to discuss your pipe project needs.

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