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。
2
The invention relates to an improvement method of a core rod of a metal rolled tube, in particular to a hollow core rod used for a planetary rolling mill.
本发明涉及一种金属轧制管的芯棒改进方法，具体地说是一种行星轧机用空芯棒。
3
A new technique for the recovery of ammonia and phenol from the residual ammonia wastewater of coking mill with hydrophobic microporous hollow fiber membrane absorption has been developed.