In recent years, in factories, stadiums and other framework from the roofs of buildings, beams, room and pillar of steel tube has been adopted steel pipe because of the tube bending ability. with the development of steel production in the construction, more and more use of steel structure, daily utensils, furniture, water supply and drainage, gas, heating and ventilation, transport and agricultural equipment manufacturing, underground resources such as coal, oil, natural gas development, defense and aerospace used guns, artillery, rockets, missiles, etc. are inseparable from the pipe, so the pipe on the national economy development and people's living standards have a close relationship.
Seamless technical standards is fully seamless performance characteristics, correct and reasonable economic use of seamless services. In the technical standards set forth in the diameter, wall thickness and tolerances, pipe length, bending, end elliptical degrees, delivery weight, markings generally specified range, lists must meet the technical requirements and mechanical properties , process performance, test items and test methods, inspection rules. For some special-purpose seamless pay special attention to some of the requirements specified in the standard requirements. Therefore, the use of seamless process both to understand the user's requirements, but also to meet the technical standards of seamless carbon steel tube.
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