JIS G 3466 SS400 STKR 400 STKR490 galvanized square hollow section 40x40x2.5
Special shape : Square and retangle shape seamless steel tubes
JIS G 3466 Carbon Steel Square and Rectangle tubes for general structure
Standard JIS G 3466
Deminsion 420mm*420mm upon requests
Wall thickness 0.5-50mm
Length 12m max
Application :for general structural purposes
Produce method:
- Forming welded steel tubes
- Seamless steel tubes into square
- Forming a steel sheet in coil into square section or into one pair of channel section followed by a continuous electric ressistance welding or automatic arc welding process.
| CHEMICAL COMPOSITION % max |
| Steel grade | C | Si | Mn | P | S |
| STKR 400 | 0.25 | - | - | 0.04 | 0.04 |
| STKR 490 | 0.18 | 0.55 | 1.5 | 0.04 | 0.04 |
| MECHANICAL PROPERTIES min |
| Steel Grade | Tensile strength Mpa | Yeild point or proof stress Mpa | Elongation % |
| STKR 400 | 400 | 245 | 23 |
| STKR 490 | 490 | 325 | 23 |
| Dimensional tolerance |
| Specified item and dimension | Dimensional tolerance |
| length of side | 100mm or under | ±1.5mm |
| over 100mm | ±1.5% |
| Unvenness of flat plate portions | side length 100mm or under | 0.5mm max |
| side length over 100mm | within 0.5% of side length |
| Angularity made by adjacent flat plate portions | ±1.5° |
| Dimension at corner:s | 3t max |
| Length | + not specified 0 |
| Un-straightness | Within 0.3% |
| Wall thickness :t | Square steel tube manufacture by welding | under 3 mm ±0.3mm
3mm or over ±10% |
| Seamless square steel tube | under 4mm ±0.6mm
4mm or over ±15% |
More: Torich JIS G3444 3466 Standard STK400 STKR 400 STKR490 Square Steel Pipe 20x20x2 used as table leg Square and rectangle Weight:
W=0.0157t(A+B-3.287t)
Coating: Hot dip zinc coating
Electrolytic zinc coating
Hot dip aluminium -coated
Hot dip zinc-5% aluminium alloy-coated
Hot dip 55% aluminium alloy coated
End: plain or charmfering
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JIS G 3466 SS400 STKR 400 STKR490 galvanized square hollow section 40x40x2.5 Images
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