Seamless
Steel Pipe is a kind of long steel with hollow section and no joints around. The steel pipe has a hollow section and is widely used as a pipeline for conveying fluids, such as oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, steel pipe is lighter when its bending and torsional strength is the same. It is a kind of economic section steel, widely used to manufacture structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. Manufacturing annular parts with steel pipes can improve the utilization rate of materials, simplify the manufacturing process, and save materials and processing hours, such as rolling bearing rings, jack sleeves, etc., which have been widely manufactured with steel pipes. Steel pipe is also an indispensable material for various conventional weapons. Gun barrel and barrel should be made of steel pipe. The steel pipe can be divided into
round pipe and special-shaped pipe according to the shape of cross section area. Because under the condition of equal perimeter, more fluid can be transported with circular tubes. In addition, when the ring section is subjected to internal or external radial pressure, the stress is relatively uniform. Therefore, most
welded steel pipe manufacturers' steel pipes are round pipes. However, circular pipes also have certain limitations. For example, under the condition of plane bending, circular pipes are not as strong as square and rectangular pipes in bending strength. Square and rectangular pipes are commonly used in some agricultural machinery frameworks, steel and wood furniture, etc. Special shaped steel pipes with other section shapes are also required according to different applications.
1. Seamless steel tubes for structures (GB/T8162-1999) are seamless steel tubes for general structures and mechanical structures.
2. Seamless steel pipe for fluid transportation (GB/T8163-1999) is a general seamless steel pipe used to transport water, oil, gas and other fluids.
3. Seamless steel tubes for low and medium pressure boilers (GB3087-1999) are carbon structural steel hot rolled and cold drawn (rolled) seamless steel tubes used to manufacture superheated steam tubes, boiling water tubes for low and medium pressure boilers of various structures and superheated steam tubes, large smoke tubes, small smoke tubes and arch brick tubes for locomotive boilers.
4. Seamless steel tubes for high pressure boilers (GB5310-1995) are carbon steel, alloy steel and stainless heat-resistant steel seamless tubes used to manufacture heating surfaces of water tube boilers with high pressure and above.
5. High pressure seamless steel pipes for fertilizer equipment (GB6479-86) are carbon structural steel and alloy steel seamless steel pipes suitable for chemical equipment and pipes with working temperature of - 40~400 ℃ and working pressure of 10~30Ma.
6. Seamless steel tubes for petroleum cracking (GB9948-88) are seamless steel tubes for furnace tubes, heat exchangers and pipes in petroleum refineries.
7. Steel pipes for geological drilling (YB235-70) are steel pipes used by geological departments for core drilling, which can be divided into drill pipes, drill collars, core pipes, casings and settling pipes according to their uses.
8. Seamless steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe for drill pipe, core pipe and casing used for diamond core drilling.
9. Oil drilling pipe (YB528-65) is a seamless steel pipe used for thickening inside or outside at both ends of oil drilling. The steel pipe is divided into two types: turning thread and non turning thread. The turning thread pipe is connected with a joint, and the non turning thread pipe is connected with a tool joint by butt welding.
10. Marine carbon steel seamless steel pipe (GB5213-85) is a kind of carbon steel seamless steel pipe used for manufacturing Class I pressure pipe system, Class II pressure pipe system, boiler and superheater. The working temperature of carbon steel seamless steel pipe wall shall not exceed 450 ℃, and that of alloy steel seamless steel pipe wall shall exceed 450 ℃.
11. Seamless steel pipe for automobile half axle sleeve (GB3088-82) is a hot-rolled seamless steel pipe made of carbon structural steel and alloy structural steel for manufacturing automobile half axle sleeve and axle tube of drive axle housing.
12. High pressure fuel pipe for diesel engine (GB3093-86) is a cold drawn seamless steel pipe used to manufacture high pressure pipe for diesel engine injection system.
13. Precision inner diameter seamless steel tubes for hydraulic and pneumatic cylinders (GB8713-88) are cold drawn or cold-rolled precision seamless steel tubes with precision inner diameter for manufacturing hydraulic and pneumatic cylinders.
14. Cold drawn or cold-rolled precision seamless steel tubes (GB3639-83) are cold drawn or cold-rolled precision seamless steel tubes with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. Selecting precision seamless steel pipe to manufacture mechanical structure or hydraulic equipment can greatly save machining hours, improve material utilization and improve product quality.
15. Stainless steel seamless steel pipes for structures (GB/T14975-1994) are hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipes made of stainless steel for corrosion resistant pipes and structural parts and parts widely used in chemical, petroleum, light textile, medical, food, machinery and other industries.
16. Seamless stainless steel pipes for fluid transportation (GB/T14976-1994) are hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipes made of stainless steel for fluid transportation.
The special-shaped seamless steel pipe is the general name of the seamless steel pipe with other cross section shapes except the round pipe. According to the different shapes and sizes of steel pipe sections, it can be divided into uniform wall thickness profiled seamless steel pipe (code D), unequal wall thickness profiled seamless steel pipe (code BD), and variable diameter profiled seamless steel pipe (code BJ). Special shaped seamless steel pipe is widely used in various structures, tools and mechanical parts. Compared with round pipes, special-shaped pipes generally have larger inertia moment and section modulus, greater bending and torsion resistance, which can greatly reduce the structural weight and save steel.
