JIS G3445 mechanical pipe is a kind of carbon steel pipe for mechanical structure. The implementation standard is JIS G344512.
JIS G3445 mechanical pipe is mainly used in fields such as machinery, automobiles, bicycles, furniture, appliances and other mechanical parts2.
The main steel pipe grades produced by JIS G3445 mechanical pipes are STKM11A, STKM12 (A, B, C), STKM (A, B, C), etc.
JIS G3445 Chemical Analysis:
| Grade | C max | Si max | Mn | P max | S max | Nb or V | ||
| Grade 11 | A | STKM11A | 0.12 | 0.35 | 0.60 max | 0.040 | 0.040 | - |
| Grade 12 | A | STKM12A | 0.20 | 0.35 | 0.60 max | 0.040 | 0.040 | - |
| B | STKM12B | |||||||
| C | STKM12C | |||||||
| Grade 13 | A | STKM13A | 0.25 | 0.35 | 0.30-0.90 | 0.040 | 0.040 | - |
| B | STKM13B | |||||||
| C | STKM13C | |||||||
| Grade 14 | A | STKM14A | 0.30 | 0.35 | 0.30-1.00 | 0.040 | 0.040 | - |
| B | STKM14B | |||||||
| C | STKM14C |
