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Detailed Description
JIS G3466 is a Japanese Industrial Standard that specifies the requirements for carbon steel square and rectangular tubes used in general structural applications, such as civil engineering, architecture, and other structural projects.
- Scope:This standard covers carbon steel square and rectangular tubes used for civil engineering, architecture, and other general structural applications.
- Applications: These tubes are commonly used in building structures, bridges, industrial equipment supports, and other civil engineering projects.
Common Steel Grades and Properties
The standard includes several grades, with STKR400 and STKR490 being the most widely used.
| Property | STKR400 | STKR490 |
|---|---|---|
| Yield Strength (MPa, min) | ≥ 245 | ≥ 325 |
| Tensile Strength (MPa) | ≥400 | ≥490 |
| Elongation (%, min) | ≥ 23 | ≥ 23 |
| Chemical Composition (Typical, max %) | C: 0.25, Mn: - , Si: - , P: 0.040, S: 0.040 | C: 0.18, Mn: 1.65, Si: 0.55, P: 0.035, S: 0.035 |
Manufacturing Process
- Formation: The tubes are manufactured by forming welded steel pipes (using electric resistance welding, forge welding, or automatic arc welding) or seamless steel pipes into the desired square or rectangular shapes.
- Heat Treatment: The tubes are typically not heat-treated unless specified by the customer.
- Surface Treatment: Galvanized steel sheets or strips can be used if requested by the customer.
Summary
JIS G3466 provides comprehensive specifications for carbon steel square and rectangular tubes used in general structural applications. The standard covers chemical composition, mechanical properties, manufacturing methods, dimensional tolerances, and testing requirements. The two main grades, STKR400 and STKR490, offer different strength levels to meet various structural needs.
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