... 5L-0699 Linzhou Fengbao Pipe Co.,Ltd. as a seamless pipe manufacturer in the worldwide marketplace specializes in production of casing and tubing ... test, tensile test, and metallographic analysis test. Before sold in the market, each of the products must be tested strictly ... 8”,10-3/4”,11-3/4”,13-3/8”,16”,18-5/8”,20” Tubing:2-3/8”,2 ... coated seamless steel pipe manufacturer Linzhou Fengbao Pipe Co.,Ltd.