GB/T 9808
GB/T 9808 (Seamless steel tubes for drilling)· GB (China) · 10 materials
| Designation | Material group | |
|---|---|---|
| ZT380 | Structural and constructional steels | chevron_right |
| ZT490 | Structural and constructional steels | chevron_right |
| ZT520 | Structural and constructional steels | chevron_right |
| ZT540 | Structural and constructional steels | chevron_right |
| ZT590 | Structural and constructional steels | chevron_right |
| ZT640 | Structural and constructional steels | chevron_right |
| ZT740 | Structural and constructional steels | chevron_right |
| ZT750 | Structural and constructional steels | chevron_right |
| ZT850 | Structural and constructional steels | chevron_right |
| ZT950 | Structural and constructional steels | chevron_right |