carbon steel square and rectangular pipe

JIS G3466 Carbon Steel Square and Rectangular Tubes

As a carbon steel pipe supplier and exporter, UNIASEN offers different production procedures for JIS G3466 carbon steel square and rectangular pipes, including resistance welding, forging welding and automatic arc welding. There are two different grades of JIS G 3466 carbon steel square and rectangular pipes: STKR400 and STKR490. The STKR400 grade has excellent weldability and toughness, making it ideal for general structural applications. Conversely, the STKR490 grade offers higher strength for structures that require superior load-bearing capacity.

We offer optional surface coatings for enhanced environmental protection and a variety of end types and joint methods for easy assembly. In addition, we also provide machining services to ensure that your pipes are ready for installation immediately after delivery.

We ensure that you can choose the steel grade that best meets the needs of your project, whether it is a residential building, commercial complex or large-scale infrastructure development.

JIS G3466 Carbon Steel Tubes Specification

Standard JIS G3466
Application Used for civil engineering architecture and other sturctures
Steel Grade STKR400, STKR490
Manufacturing ERW and Seamless into square tubes.
Dimension Square 20*20 to 350*350
Rectangular 30*20 to 400*200
Wall thickness Square 1.2 – 12.5 mm
Rectangular 1.2 – 12 mm
Test Chemical analysis
Tensile test
Comparative Standard ASTM A500 {Gr.B Gr.C}, EN10025 {S275JR S355J0}, KS {SPSR400 SPSR490}

JIS G3466 Carbon Stee Square and Rectangular Tubes Dimension

Permissible Specified Outside Diameter and Specified Wall Thickness
Specified Outside Diameter D mm (in.) Specified Wall Thickness t mm (in.)
Special Light Sizes a Regular Sizes
≥ 10.3 (0.405) to < 13.7 (0.540) ≥ 1.7 (0.068) to ≤ 2.4 (0.094)
≥ 13.7 (0.540) to < 17.1 (0.675) ≥ 2.2 (0.088) to ≤ 3.0 (0.118)
≥ 17.1 (0.675) to < 21.3 (0.840) ≥ 2.3 (0.091) to ≤ 3.2 (0.125)
≥ 21.3 (0.840) to < 26.7 (1.050) ≥ 2.1 (0.083) to ≤ 7.5 (0.294)
≥ 26.7 (1.050) to < 33.4 (1.315) ≥ 2.1 (0.083) to ≤ 7.8 (0.308)
≥ 33.4 (1.315) to < 48.3 (1.900) ≥ 2.1 (0.083) to ≤ 10.0 (0.394)
≥ 48.3 (1.900) to < 60.3 (2.375) ≥ 2.1 (0.083) to ≤ 12.5 (0.492)
≥ 60.3 (2.375) to < 73.0 (2.875) ≥ 2.1 (0.083) to ≤ 3.6 (0.141) > 3.6 (0.141) to ≤ 14.2 (0.559)
≥ 73.0 (2.875) to < 88.9 (3.500) ≥ 2.1 (0.083) to ≤ 3.6 (0.141) > 3.6 (0.141) to ≤ 20.0 (0.787)
≥ 88.9 (3.500) to < 101.6 (4.000) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 22.0 (0.866)
≥ 101.6 (4.000) to < 168.3 (6.625) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 25.0 (0.984)
≥ 168.3 (6.625) to < 219.1 (8.625) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 40.0 (1.575)
≥ 219.1 (8.625) to < 273.1 (10.750) ≥ 3.2 (0.125) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 40.0 (1.575)
≥ 273.1 (10.750) to < 323.9 (12.750) ≥ 3.6 (0.141) to ≤ 5.2 (0.203) > 5.2 (0.203) to ≤ 45.0 (1.771)
≥ 323.9 (12.750) to < 355.6 (14.000) ≥ 4.0 (0.156) to ≤ 5.6 (0.219) > 5.6 (0.219) to ≤ 45.0 (1.771)
≥ 355.6 (14.000) to < 457 (18.000) ≥ 4.5 (0.177) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 457 (18.000) to < 559 (22.000) ≥ 4.8 (0.188) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 559 (22.000) to < 711 (28.000) ≥ 5.6 (0.219) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 711 (28.000) to < 864 (34.000) ≥ 5.6 (0.219) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 52.0 (2.050)
≥ 864 (34.000) to < 965 (38.000) ≥ 5.6 (0.219) to ≤ 52.0 (2.050)
≥ 965 (38.000) to < 1422 (56.000) ≥ 6.4 (0.250) to ≤ 52.0 (2.050)
≥ 1422 (56.000) to < 1829 (72.000) ≥ 9.5 (0.375) to ≤ 52.0 (2.050)
≥ 1829 (72.000) to < 2134 (84.000) ≥ 10.3 (0.406) to ≤ 52.0 (2.050)
NOTE Standardized values for specified outside diameter and specified wall thickness of pipe are given in ISO 4200 [7] and ASME B36.10M[8]
a Pipe having the combination of specified outside diameter and specified wall thickness is defined as special light size pipe; other combinations given in this table are defined as regular size pipe.

JIS G3466 Tubes Chemical Requirement

Symbol of Grade C Si Mn P S
STKR400 0.25 max. 0.040 max. 0.040 max.
STKR490 0.18 max. 0.55 max. 1.50 max. 0.040 max. 0.040 max.
Note If necessary,Other alloy elements than those given in this table may be added.

JIS G3466 Tubes Mechanical Requirement

Mechanical Properties
Symbol of Grade Tensile Strength N/mm2 Yield Point or Proof Stress N/mm2 Elongation %
Tensile Test piece Test direction
Test piece No.5 Tube axis direction
STKR400 400 min. 245 min. 23 min.
STKR490 490 min. 325 min. 23 min.
NOTE: 1 N/mm2=1 MPa

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