GB/T 9808
GB/T 9808 (钻探用无缝钢管)· GB (中国) · 10 种材料
| 名称 | 材料组别 | |
|---|---|---|
| ZT380 | 结构钢 | chevron_right |
| ZT490 | 结构钢 | chevron_right |
| ZT520 | 结构钢 | chevron_right |
| ZT540 | 结构钢 | chevron_right |
| ZT590 | 结构钢 | chevron_right |
| ZT640 | 结构钢 | chevron_right |
| ZT740 | 结构钢 | chevron_right |
| ZT750 | 结构钢 | chevron_right |
| ZT850 | 结构钢 | chevron_right |
| ZT950 | 结构钢 | chevron_right |