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