51 steel pipe network commentary: seamless steel pipe knowledge.
Seamless steel tubes: Seamless steel tubes are made by punching a steel ingot or a solid tube and then hot-rolled, cold-rolled, or cold drawn. The specifications of the seamless steel pipe are expressed in terms of outer diameter*thickness mm. Seamless steel tube is divided into hot-rolled and cold-rolled (dial) seamless steel tubes. Hot-rolled seamless steel tubes are divided into general steel tubes, low- and medium-pressure boiler steel tubes, high-pressure boiler tubes, alloy steel tubes, stainless steel tubes, petroleum cracking tubes, geological steel tubes, and other steel tubes. Cold-rolled (dial) seamless steel pipes include general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, as well as carbon thin-walled steel pipes and alloy thin-walled steel pipes. Stainless steel pipe, special-shaped steel pipe.
Hot-rolled seamless pipe outer diameter is generally greater than 32mm, wall thickness 2.5-75mm, cold-rolled seamless steel pipe diameter can be to 6mm, wall thickness can be to 0.25mm, thin-walled pipe outer diameter to 5mm wall thickness is less than 0.25mm, cold Rolling has higher dimensional accuracy than hot rolling.
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