J55 oil casing pipe is a kind of tubing used as the material of petroleum well wall for a long time. It is connected to thousands of kilometers of pipe string through special thread. In the downhole cementing process, it is mainly affected...英国华人论坛
How to treat hot-rolled seamless steel pipe scale1, three acid (sulfuric acid, nitric acid and hydrochloric acid) pickling: three acid pickling is made from three acid according to certain proportion, is a mor...英国华人论坛
Liberation truck frame assembly of stringers and stiffeners, beams and plate and the material portion of the stent are used 355L hot-rolled steel, depending on the structural strength requirements, the use of hot-rolled steel 355L thickness...英国华人论坛