Torich International Limited
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STKR 400 2”*2“ Forming Welded Carbon Steel Square Tubes for General Structure
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:
| 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 |
| Seamless square steel tube | under 4mm ±0.6mm | |
