Carbon steel seamless steel pipe is a kind of hollow section, no joints around the strip steel. Steel tubes with hollow sections are widely used as conduits for conveying fluids, such as oil, natural gas, gas, water and some solid materials.

Compared with solid steel such as round steel, steel pipe has the same bending and torsional strength and is lighter in weight. It is a kind of economic section steel, widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction.

Steel pipe manufacturing ring parts, can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing ring, jack sleeve, etc., has been widely used to manufacture steel pipe.

Steel pipe or a variety of conventional weapons indispensable material, barrel, barrel, etc. to steel pipe to manufacture. Steel pipe can be divided into round pipe and special-shaped pipe according to the different shape of the cross-sectional area. More fluid can be transported with a circular tube because the volume of the circular surface is the largest when the circumference is equal. In addition, the annular section under internal or external radial pressure, the force is more uniform, so the vast majority of steel pipe is round.

Steel pipe manufacturing ring parts, can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing hours, such as rolling bearing ring, jack sleeve, etc., has been widely used to manufacture steel pipe.

It is divided into 10# seamless steel pipe, 20# seamless steel pipe, 45# seamless steel pipe and so on.

Carbon steel seamless steel pipe material factors

(1) The importance of structure Heavy industrial building structure, long-span structure, high-rise or super high-rise civil building structure or structure and other important structures, should consider the selection of good quality Taiyuan seamless steel pipe, general industrial and civil building structure, can be selected according to the nature of the ordinary quality of Taiyuan seamless steel pipe [1].

(2) load conditions of the structure directly under dynamic load and structure in strong earthquake area, should choose Taiyuan seamless steel pipe with good comprehensive performance; General bearing static load structure can choose the lower price of Taiyuan seamless steel pipe.

(3) Connection method Welding process will produce welding deformation, welding stress and other welding defects, which may lead to cracks or brittle fracture of the structure. Therefore, the welding structure of the material requirements should be strict.

(4) The temperature and environment of the structure. Taiyuan seamless steel pipe is easy to be cold and brittle at low temperature. Therefore, the structure working at low temperature, especially the welding structure, should be composed steel with good resistance to low temperature brittleness. In addition, the open-air structure of Taiyuan seamless steel pipe is easy to produce aging, harmful medium effect of Taiyuan seamless steel pipe is easy to corrosion, fatigue and fracture, should also be different materials.

(5) The thickness of Taiyuan seamless steel pipe, thin Taiyuan seamless steel pipe rolling times, rolling compression ratio is large, large thickness of Taiyuan seamless steel pipe compression ratio is small, so the thickness of the precision steel pipe is not only small strength, but also poor plasticity, impact toughness and welding performance. Therefore, the welded structure with large thickness should be made of Taiyuan seamless steel pipe with better material.