Seamless steel pipe is a long steel strip with a hollow cross-section and no seams around it. Seamless steel pipe has a hollow cross-section and can be used as a pipeline for conveying fluids, such as pipelines for conveying oil, natural gas, coal gas, water, and certain solid materials. Compared with solid steel such as round steel, seamless steel pipe is lighter in weight when the bending and torsional strength are the same. It is an economical cross-section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. Using seamless steel pipes to manufacture annular parts can improve material utilization, simplify manufacturing processes, and save materials and processing time, such as rolling bearing rings, jack sleeves, etc., which are currently widely manufactured with steel pipes. Steel pipes are also indispensable materials for various conventional weapons. Gun barrels and cannon barrels are all made of steel pipes. Steel pipes can be divided into round steel pipes and special-shaped steel pipes according to the different shapes of cross-sectional areas. Since the circle has the largest area under the condition of equal circumference, more fluids can be transported using round pipes. In addition, the circular cross-section is subjected to more uniform force when subjected to internal or external radial pressure. Therefore, most steel pipes are round steel pipes. However, round steel pipes also have certain limitations. For example, under the condition of plane bending, round steel pipes are not as strong as square and rectangular steel pipes in bending strength. Square and rectangular steel pipes are often used in some agricultural machinery frames, steel and wood furniture, etc. According to different uses, special-shaped steel pipes with other cross-sectional shapes are also required.
1. Seamless steel pipes for structures (GB/T8162-2008) are seamless steel pipes used for general structures and mechanical structures.
2. Seamless steel pipes for fluid transportation (GB/T8163-2008) are general seamless steel pipes used for conveying fluids such as water, oil, and gas.
3. Seamless steel pipes for low and medium-pressure boilers (GB3087-2008) are high-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes used to manufacture various structural low and medium-pressure boiler superheated steam pipes, boiling water pipes, and locomotive boiler superheated steam pipes, large smoke pipes, small smoke pipes, and arch brick pipes.
4. Seamless steel pipes for high-pressure boilers (GB/T5310-2017) are high-quality carbon steel, alloy steel, and stainless heat-resistant steel seamless steel pipes used to manufacture the heating surface of water tube boilers with high pressure and above.
5. High-pressure seamless steel pipes for fertilizer equipment (GB6479-2013) are high-quality carbon structural steel and alloy steel seamless steel pipes suitable for chemical equipment and pipelines with working temperatures of -40~400℃ and working pressures of 10~30Ma.
6. Seamless steel pipes for petroleum cracking (GB9948-2013) are seamless steel pipes for furnace tubes, heat exchangers, and pipelines in petroleum refineries.
7. A geological drilling steel pipe (YB235-70) is a steel pipe used by geological departments for core drilling. According to the purpose, it can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe, etc.
8. Diamond core drilling seamless steel pipe (GB3423-82) is a seamless steel pipe for drill pipe, core rod, and casing used for diamond core drilling.
9. Petroleum drilling pipe (YB528-65) is a seamless steel pipe with internal or external thickening at both ends used for petroleum drilling. Steel pipes are divided into threaded and non-threaded. Threaded pipes are connected with joints, and non-threaded pipes are connected with tool joints by butt welding.
10. Carbon steel seamless steel pipe for ships (GB5213-85) is a carbon steel seamless steel pipe used for manufacturing ship Class I pressure-resistant pipe systems, Class II pressure-resistant pipe systems, boilers, and superheaters. The working temperature of the carbon steel seamless steel pipe wall does not exceed 450℃, and the working temperature of the alloy steel seamless steel pipe wall exceeds 450℃.
11. Seamless steel pipe for automobile half-axle sleeve (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe used to manufacture automobile half-axle sleeves and drive axle housing shaft tubes.
12. High-pressure oil pipe for diesel engines (GB3093-2002) is a cold-drawn seamless steel pipe used to manufacture high-pressure pipes for diesel engine injection systems.
13. Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB8713-2009) is a cold-drawn or cold-rolled precision seamless steel pipe with a precise inner diameter size for manufacturing hydraulic and pneumatic cylinders.
14. Cold-drawn or cold-rolled precision seamless steel pipe (GB/T3639-2009) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment.
15. Seamless stainless steel pipe for structure (GB/T14975-2002) is a hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipe made of stainless steel for corrosion-resistant pipes and structural parts and components widely used in chemical, petroleum, textile, medical, food, machinery, and other industries.
16. Seamless stainless steel pipe for fluid transportation (GB/T14976-2002) is a hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipe made of stainless steel for conveying fluid.
17. Special-shaped seamless steel pipe is a general term for seamless steel pipes with other cross-sectional shapes except round pipes. According to the different cross-sectional shapes and sizes of steel pipes, they can be divided into equal wall thickness special-shaped seamless steel pipes (code D), unequal wall thickness special-shaped seamless steel pipes (code BD), and variable diameter special-shaped seamless steel pipes (code BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools, and mechanical parts. Compared with round tubes, special-shaped steel tubes generally have larger moments of inertia and section modulus, and greater bending and torsional resistance, which can greatly reduce the weight of the structure and save steel.
Post time: Oct-21-2024