STKR400/490
These are JIS-mark certified square hollow sections for general structure. Welded steel pipes that are manufactured by electric resistance welding of steel strips are continuously formed into square sections in the product of these Cold formed square hollow sections. （JIS Certification No. JQ0508074）
Product Specifications
1. Mechanical properties
| Product | Tensile test | |||
|---|---|---|---|---|
| Yield strength (N/mm²) |
Tensile strength (N/mm²) |
Elongation [No. 5] (%) |
||
| STKR400 | 245≦ | 400≦ | 23≦ | |
| STKR490 | 325≦ | 490≦ | 23≦ | |
2. Chemical composition
| Product | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| STKR400 | ≦0.25 | ー | ー | ≦0.040 | ≦0.040 |
| STKR490 | ≦0.18 | ≦0.55 | ≦1.50 | ≦0.040 | ≦0.040 |
* Unit (%)
1. Alloy elements other than those specified above may be added, as needed.
3. Manufacturing size
| Size/Thickness(mm) | 9 | 12 |
|---|---|---|
| 250×250 | ○ | ○ |
| 300×300 | ○ | ○ |
| 350×350 | ○ | ○ |
