GB/T 31315
GB/T 31315 (Cold drawn or cold rolled precision welded steel tubes for mechanical structures)· GB (China) · 5 materials
| Designation | Material group | |
|---|---|---|
| Q195 | Structural and constructional steels | chevron_right |
| Q215 | Structural and constructional steels | chevron_right |
| Q235 | Structural and constructional steels | chevron_right |
| Q275 | Structural and constructional steels | chevron_right |
| Q345 | Structural and constructional steels | chevron_right |