... our product include: all kinds of dowel pins,sheel pin, double cone pin, Casing head forging, tubing head forging, casing spool ... way, six-way forging, eight-way forging, valve body forging, double-flange joint forging, locking coupling forging, and so on. Materials ... year, our company have built advanced physical and chemical laboratory cable of doing heat treatment, UT and mechnical proporties tests. ...