Cast steel hollow spherical joint with tube is a new type of cast steel joint.
铸钢空心球管节点是一种新型的铸钢节点形式。
They are fitted fly saw of high-frequency welding tube sets, used for cutting steel tubes and Hollow steel window and door profiles continuously.
锯片安装在高频焊管机组的飞锯上适合连续切割钢管以及建筑用空腹钢门窗。
Common round steel or steel tube may be rolled into solid or hollow twist drill rods by using the said rolling mill.
普通元钢或普通钢管经此轧机后，可直接变成实心或空心麻花钻杆钢。
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