Use of seamless carbon steel pipe

Posted by zora li on September 6th, 2022

Carbon steel seamless steel pipe is a long strip of steel. Steel pipe has a hollow cross section, a large number of used for conveying fluid pipelines, such as conveying oil, natural gas, gas, water and some solid materials pipelines. Compared with solid steel such as round steel, steel pipe has the same bending and torsional strength and is light in weight. It is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile drive shaft, bicycle frame and steel scaffolding used in construction, etc.
Making ring parts with steel pipe can improve the material utilization rate, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack covers, etc., have been widely used in steel pipe manufacturing.
Steel pipe is also an indispensable material for all kinds of conventional weapons. Gun barrel and barrel are made of steel pipe. Steel pipe can be divided into round pipe and special pipe according to the different shape of cross-sectional area. Since the circular surface product is maximum when the circumference is equal, more fluid can be transported with a circular tube. In addition, the annular section is subjected to the internal or external radial pressure, the force is relatively uniform, therefore, the vast majority of steel tubes are round tubes.
Making ring parts with steel pipe can improve the material utilization rate, simplify the manufacturing process, save the material and processing time, such as rolling bearing ring, jack cover, etc., has been widely used in steel pipe manufacturing.
It is divided into 10# seamless steel pipe, 20# seamless steel pipe, 45# seamless steel pipe and so on.
Material factors
(1) The importance of structure heavy industrial building structure, large span structure, high-rise or super high-rise civil building structure or structure and other important structures, should consider the selection of good quality seamless steel pipe, for general industrial and civil building structure, can be selected according to the nature of the work of ordinary quality seamless steel pipe.

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

(3) The welding process of the connection method 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, seamless steel tube is easy to be cold and brittle at low temperature, so the structure working at low temperature, especially the welding structure, should be selected with good anti-low temperature brittle performance of the calm steel. In addition, the open structure of Taiyuan seamless steel tube is easy to produce aging, and the harmful medium of the seamless steel tube is easy to corrosion, fatigue and fracture, so different materials should be selected.

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