Seamless steel pipe is made of whole round steel perforated, the surface of the steel pipe without weld, called seamless steel tube. According to the production method, the seamless steel pipe can be divided into hot rolling seamless pipe, cold rolling seamless steel tube, cold drawing seamless steel tubes, extrusion seamless steel pipes, pipe jacking and so on. According to the section shape, seamless steel pipe is divided into circular and special-shaped, shaped pipe square, oval, triangular, hexagon, melon seed, star, with a variety of complex shapes. The maximum diameter is 900mm, the minimum diameter is 4mm. According to the use of different, there are thick seamless steel pipe and thin seamless steel tube. Seamless steel pipe is mainly used for petroleum geological drilling pipe, petrochemical cracking pipe, furnace pipe, bearing pipe and high precision structural steel pipe used in cars, tractors, aviation, etc. Seamless steel pipe is widely used.
1, general purpose seamless steel pipe by ordinary carbon steel structure, low-alloy steel structure or alloy structure steel rolling, the production capacity of the most, mainly used to transport fluid pipelines or structural parts.
2, divided into three categories according to different uses:
A, according to chemical composition and mechanical properties;
B, according to the mechanical properties of supply;
C, according to water pressure test supply. Pipes supplied according to class a and b shall also be subjected to hydrostatic testing if used to withstand liquid pressures.
3, Special uses of seamless pipe have boiler seamless pipe, chemical power with, geological seamless steel pipe and oil seamless pipe.
Seamless steel pipe with hollow cross-section, used in large quantities for the transmission of fluid pipeline, such as transmission of oil, natural gas, gas, water and certain solid materials such as pipeline. Compared with solid steel such as round steel, the steel tube is a kind of economic section steel because its bending and torsion strength is the same.
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 building construction, etc. The utility model can improve the material utilization ratio, simplify the manufacturing process, save material and processing time, and has been widely used in steel pipe manufacturing.
Application of seamless steel pipe in construction piping industry
In the many pipeline materials, the most practical is the seamless steel pipe, which is a relatively powerful pipe material, Not only because of the wide range of the use of this pipeline material, more importantly, because the quality of seamless steel pipe is very good, seamless steel tube quality is the reason that this pipe material can be promoted and developed in the industrial field, The quality of seamless steel pipe is very good, this is the seamless steel tube complex production process decided, seamless steel steel pipe wall of the most characteristic is the most seamless pipe without any seams, And ordinary pipe has obvious joints, seamless steel pipe is the small characteristics, let this type of pipe material can be used and promoted in the industrial field.
Seamless steel pipe is mainly used in pipeline transport, can be used to transport some fluid, such as some energy, etc. Oil and natural gas have some groundwater transport, can rely on seamless steel pipe to achieve, in the modern society, the use of seamless steel pipes and the scope of once again have 16Mn seamless pipe is widely used. The general purpose seamless steel pipe is made of ordinary carbon steel, low-alloy steel or alloy steel, and it is the most productive. The seamless steel pipe made of this kind of steel is widely used in hydraulic prop, high-pressure gas cylinder, high-pressure boiler, fertilizer equipment, petroleum cracking, automobile axle sleeve, diesel engine. Seamless steel pipe, wall pipe, seamless steel tube manufacturers, etc., products strictly comply with national standards, all produced in our factory and large state-owned steel mills, such as: Maanshan Iron and Steel, Laiwu Iron & Steel Co., Ltd. As the largest steel pipe wholesaler in Xi’an, long-term inventory of more than 10,000 tons, inventory and sales in the same enterprises in the country are the first. Therefore, depending on the chemical composition (mainly carbon content), heat treatment process and use. To further use and promotion, talk about seamless steel pipe, we will first think of this pipe material quality is superior, This is the seamless steel pipe is the biggest feature of seamless steel tube, followed by seamless steel tubes used is the structure of steel, seamless steel pipes so the hardness is very high.
Energy transport is of great significance, and seamless steel pipe in which play an important role, when it comes to this type of pipeline materials, we first strength is slightly higher than 15 steel, rarely quenched, no temper brittleness. High cold plastic deformation, general for bending, rolling, bending and hammer arch processing, electric arc welding and contact welding welding performance is good, gas welding thickness is small, strict requirements or shape of the product cracks. Machinability cold drawing or normalizing state than annealing state is good, generally used in the manufacture of small force and high toughness requirements. Perennial to maintain inventory of about 10,000 tons, annual sales of over 100 million yuan. Products sold are implemented national standards, apply to engineering, coal mining, textile should see the seamless steel pipe in the price advantage, Although the quality of seamless steel pipe is good, but this pipe material is actually very high, these are the advantages of the seamless steel tube.