Spiral steel pipe is a long strip of steel with a hollow section and no joints around it. The steel pipe has a hollow section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight when the bending and torsional strength is the same. and steel scaffolding used in building construction. Making ring parts with steel pipes can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack sets, etc., which have been widely used in steel pipe manufacturing. Steel pipe is also an indispensable material for various conventional weapons. Gun barrels, barrels, etc. must be made of steel pipes. Steel pipes can be divided into round pipes and special-shaped pipes according to the shape of the cross-sectional area. Due to the area of ??the circle under the condition of an equal perimeter, more fluid can be transported with a circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes.
However, round pipes also have certain limitations. For example, under the condition of plane bending, round pipes are not as strong as square and rectangular pipes. Some agricultural machinery skeletons, steel and wood furniture, etc., are commonly used. Special-shaped steel pipes with other cross-sectional shapes are also required according to different purposes.
1. Structural
spiral steel pipes are
spiral steel pipes used for general structures and mechanical structures.
2.
Spiral steel pipe for fluid conveying is a general
spiral steel pipe used for conveying fluids such as water, oil, and gas.
3.
Spiral steel pipes for low and medium pressure boilers are high-quality carbon structures used to manufacture superheated steam pipes, boiling water pipes, superheated steam pipes, large smoke pipes, small smoke pipes, and arch brick pipes for low and medium pressure boilers of various structures. Steel hot-rolled and cold-drawn (rolled)
spiral steel pipes.
4.
Spiral steel pipes for high-pressure boilers are high-quality carbon steel, alloy steel, and stainless heat-resistant steel
spiral steel pipes used to manufacture the heating surface of water-tube boilers with high pressure and above.
5. High-pressure
spiral steel pipe for fertilizer equipment is a high-quality carbon structural steel and alloy steel
spiral steel pipe suitable for chemical equipment and pipelines with a working temperature of -40~400℃ and a working pressure of 10~30Ma.
6.
Spiral steel pipes for oil cracking are
spiral steel pipes for furnace tubes, heat exchangers, and pipelines in petroleum refineries.
7. The steel pipe for geological drilling is the steel pipe used by the geological department for core drilling. It can be divided into the drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the purpose.
8.
Spiral steel pipe for diamond core drilling is a
spiral steel pipe for drill pipe, core rod and casing for diamond core drilling.
9. Oil drilling pipe is a
spiral steel pipe that is thickened inside or outside at both ends of oil drilling. The steel pipe is divided into two types: threading and non-threading. The threading pipe is connected with the joint, and the non-threading pipe is connected with the tool joint by the method of butt welding.
10. The carbon steel
spiral steel pipe for ships is a carbon steel
spiral steel pipe for the manufacture of Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers and superheaters. The working temperature of the carbon steel
spiral steel pipe wall does not exceed 450 ℃, and the working temperature of the alloy steel
spiral steel pipe wall exceeds 450 ℃.
11.
Spiral steel pipes for automobile axle casings are high-quality carbon structural steel and alloy structural steel hot-rolled
spiral steel pipes for manufacturing automobile axle casings and axle casings of drive axles.
12. The high-pressure oil pipe for diesel engine is a cold-drawn
spiral steel pipe for manufacturing high-pressure pipe of diesel engine injection system.
13. Precision inner diameter
spiral steel pipes for hydraulic and pneumatic cylinders are cold-drawn or cold-rolled precision
spiral steel pipes with precise inner diameters for the manufacture of hydraulic and pneumatic cylinders.
14. Cold-drawn or cold-rolled precision
spiral steel pipe is a cold-drawn or cold-rolled precision
spiral steel pipe used for mechanical structure, hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision
spiral steel pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining hours, improve material utilizand help improves product quality.
15. Structural stainless steel
spiral steel pipe is a hot-rolled (extruded, expanded) and cold-drawn ( Rolled)
spiral steel pipe.
16. Stainless steel
spiral steel pipe for fluid transportation is a hot-rolled (extrusion, expansion) and cold-drawn (rolled)
spiral steel pipe made of stainless steel for fluid transportation.
17. Special-shaped
spiral steel pipe is a general term for
spiral steel pipes with other cross-sectional shapes other than round pipes. According to the shape and size of the steel pipe section, it can be divided into special-shaped
spiral steel pipe with equal wall thickness, special-shaped
spiral steel pipe with unequal wall thickness, and variable-diameter special-shaped
spiral steel pipe. Special-shaped
spiral steel pipes are widely used in various structural parts, tools, and mechanical parts. Compared with the round tube, the special-shaped tube generally has a larger moment of inertia and section modulus and has a larger bending and torsion resistance, which can greatly reduce the structural weight and save steel.
