Abstract: Serious sampling and integrated analysis were carried out in the production of pipe steel with LF-VD, RH-LF and LF-RH refining processes. It is shown that high grade pipe steel can be produced with the three refining processes, but the purity and cleanness of the steel produced with LF-RH process are higher; the functions of different refining instruments are distinct, but they are affected effected by up and down working procedures because of the conjunction and restriction of the quantity and composition of refining slag and other factors.