Seamless steel pipe with steel ingot or a solid billet made by perforated capillary, and then by hot rolling, cold rolling or cold. Seamless steel pipe specifications with outer diameter * wall thickness mm number representation. Seamless steel tube branch hot-rolled and cold-rolled seamless steel pipe ( DIAL ) two class. Hot rolled seamless steel tube branch general steel, low, medium pressure boiler steel pipes, high-pressure boiler tubes, alloy pipe, stainless steel pipe, oil cracking tube, pipe and other steel pipe and other geological. Cold rolling seamless steel pipe ( DIAL ) in addition to points of general steel, low and medium pressure boiler steel pipes, high-pressure boiler tubes, alloy pipe, stainless steel pipe, oil cracking tube, the other steel tube, also includes carbon thin walled steel pipe, alloy thin-wall steel pipe, stainless steel pipe, shaped steel tube with thin wall. Hot rolled seamless tube outer diameter is larger than 32mm in general, wall thickness of 2.5-75mm, cold-rolled seamless steel pipe outside diameter wall thickness to 6mm, to 0.25mm, thin-walled tube outer diameter to wall thickness less than 5mm 0.25mm, cold-rolled hot-rolled high dimensional accuracy than.General seamless steel tube is 10, 20, 30, 35, 45, 16Mn, 5MnV carbon steel and low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB alloy steel hot or cold. 10, 20, low carbon steel seamless tube for fluid pipeline. In 45, 40Cr made of carbon steel seamless pipe used to make machine parts, such as automobile, tractor parts under stress. General seamless steel pipe to ensure the strength and flattening test. Hot rolled steel in hot state or heat treatment state of delivery; cold with heat treatment state of delivery.
