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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 |
under 4mm ±0.6mm | ||
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 |
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.
Standard: JIS G3466 STKR400 STKR490
Sizes:20MMX20MM -- 500MMX500MM 550MMX550MM -- 1200MMX1200MM
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