JIS G3466 Square And Rectangular Steel Tubes

Tianjin Brisk Steel is one of the JIS G3466 Square and Rectangular Steel Tubes in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.

 PRODUCT

Tianjin Brisk Steel focus on produce and supply hollow section and steel pipe

We produce JIS G3466 square and rectangular tube to the current JIS specification, with mill test certificates covering chemical composition and mechanical properties against the standard's requirements.

JIS G3466 defines two grades, not a long ladder like some structural standards carry. STKR400 has a minimum tensile strength of 400 MPa and yield point around 245 MPa; STKR490 steps up to a minimum tensile strength of 490 MPa with a higher yield point, achieved through a higher carbon/manganese content rather than a different production process. Both are cold-formed ERW tube from coil - the grade difference sits entirely in the steel chemistry going into the mill, not in how the tube is shaped or welded.

STKR400 covers the large majority of general structural and machinery-frame work. STKR490 gets specified where a structural calculation needs the higher yield point to reduce section size or where a Japanese design standard (built around STKR490 as its default higher grade) calls for it directly - it's worth checking your project's structural drawings for the grade callout rather than defaulting to STKR400 on the assumption that "standard" means "lower grade."

This is worth addressing directly because it trips up buyers who haven't sourced JIS material before: producing tube that meets the JIS G3466 technical specification and holding the official JIS mark (the certification licensed by Japan's accreditation system, following an on-site audit of the specific production line) are two different things. A mill can manufacture fully to the JIS G3466 chemistry, dimensions, and mechanical property requirements - verifiable through standard mill test certificates and third-party inspection - without holding JIS mark certification, which is a separate and specifically Japan-administered scheme.

For most export projects specifying "JIS G3466" as the technical standard, meeting the specification with documented test results is what the buyer actually needs. For projects where the JIS mark itself is a contractual requirement - some Japanese public works and certain OEM supply chains - that's a materially different ask, and it should be confirmed at inquiry stage rather than assumed either way. Tell us which one your project needs; we can tell you plainly whether we're quoting spec-compliant tube or whether JIS-mark-certified material needs to be sourced through a different route.

JIS G3466 doesn't share a size series with ASTM A500 (inch-based nominal sizing) or EN 10219 (its own continental European preferred-size list). It has its own preferred outer dimension and wall thickness combinations, and the corresponding theoretical weight per meter is calculated against those specific dimensions - not always identical to what a same-OD, same-WT tube from a different standard would weigh, once corner radius and forming tolerance differences are accounted for. On projects where structural calculations were run against JIS section tables, substituting an ASTM or EN section of "equivalent" size without checking the weight and section property tables against JIS G3466 specifically can leave the actual built section slightly off from what the calc assumed.

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