Classification of steel pipes

First, the classification of steel pipes

• According to the manufacturing technology - arc welded pipe, electric resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace welded pipe
• According to the weld seam - straight seam welded pipe, spiral welded pipe

Second, introduction of seamless steel pipe

The seamless steel pipe is a long strip of steel having a hollow section and no seams around it. Steel pipes have a hollow section and are used in large quantities as pipes for transporting fluids, such as pipes for transporting oil, natural gas, gas, water and certain solid materials.
Compared with solid steel, such as round steel, seamless steel pipe is lighter in weight when it has the same bending and torsional strength. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycles. Shelf and steel scaffolding used in construction. The use of steel pipes to manufacture ring-shaped parts can improve material utilization, simplify manufacturing processes, save materials and processing man-hours, such as rolling bearing rings, jacks, etc., and have been widely used in steel pipes. Steel pipes are also indispensable materials for various conventional weapons, and barrels, barrels, etc. are all made of steel pipes.
Steel pipes can be divided into round pipes and shaped pipes according to the shape of the cross-sectional area. Since the area of the circle is the largest under the condition of equal circumference, more fluid can be transported by the circular tube. In addition, the circular section is subjected to a relatively uniform force when subjected to internal or external radial pressure, and therefore, most of the steel pipes are round pipes. However, the round pipe also has certain limitations. For example, under the condition of being bent by the plane, the round pipe is not as strong as the square and rectangular pipe, and some agricultural machinery skeletons, steel wood furniture, etc. are commonly used square and rectangular pipes. Shaped steel pipes of other cross-section shapes are also required depending on the application.

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1. Structural seamless steel pipe (GB/T 8162-2008) is a seamless steel pipe for general structural and mechanical structures.

2. Seamless steel pipe for fluid transportation (GB/T 8163-2008) is a general seamless steel pipe for conveying fluids such as water, oil and gas.

3. Seamless steel pipe for low and medium pressure boilers (GB 3087-2008) is used for the manufacture of superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes, large smoke pipes, small pipes and arches for various structures of low and medium pressure boilers. Hot-rolled and cold-drawn (rolled) seamless steel tubes of high-quality carbon structural steel for brick tubes.

4. Seamless steel pipe for high-pressure boiler (GB 5310-2008) is a high-quality carbon steel, alloy steel and stainless steel heat-resistant steel seamless pipe for the heating surface of water tube boilers for high pressure and above.

5. High-pressure seamless steel pipe for chemical fertilizer equipment (GB 6479-2013) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with working temperature of -40~400 and working pressure of 10~30Ma.

6. Seamless steel pipe for petroleum cracking (GB 9948-2013) is a seamless pipe for furnace tubes, heat exchangers and pressure pipes for petroleum refineries.

7. Seamless steel pipe for geological drilling (GB/T 9808-2008) is a steel pipe used for geological drilling by the geological department. It can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the application.

8. Geological core drilling tools (GB/T 16950-2014) specify seamless steel pipes for geological core drilling tools.

9. Oil Drilling Pipe (YB 528-65) is a seamless steel pipe used for thickening or external thickening at both ends of oil drilling. There are two kinds of steel pipe and no wire, the wire pipe is connected by a joint, and the non-wire pipe is welded by a butt welding method and a tool joint.

10. Marine carbon steel and carbon-manganese steel seamless steel pipe (GB/T 5312-2009) is a seamless production of carbon steel and carbon-manganese steel for ship I-class pressure piping, grade pressure piping, boiler and superheater. Steel Pipe. 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 semi-axle casing (GB 3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe for automobile semi-axle casing and axle axle of drive axle.

12. High-pressure seamless steel pipe for diesel engine (GB/T 3093-2002) is a cold drawn seamless steel pipe for the manufacture of high-pressure pipes for diesel injection systems.

13. Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB 8713-88) is a cold drawn or cold rolled precision seamless steel pipe with precision inner diameter for the manufacture of hydraulic and pneumatic cylinders.

14. Cold drawn or cold rolled precision seamless steel pipe (GB/T 3639-2009) 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. The use of precision seamless steel tubes to manufacture mechanical structures or hydraulic equipment can greatly reduce machining time, improve material utilization, and improve product quality.

15. Structural stainless steel seamless steel pipe (GB/T 14975-2012) is a hot-rolled stainless steel widely used in chemical, petroleum, textile, medical, food, machinery and other industries for corrosion-resistant pipes and structural parts and parts. (Squeeze, expand) and cold drawn (rolled) seamless steel tubes.

16. Stainless steel seamless pipe for fluid transportation (GB/T 14976-2012) is a hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipe made of stainless steel for conveying fluid.

17. Shaped seamless steel pipe is a general term for seamless steel pipes of other cross-section shapes other than round pipes. According to the shape and size of the cross-section of the steel pipe, it can be divided into equal-wall-thick profiled seamless steel pipe (code D), unequal wall thickness profiled seamless steel pipe (codenamed BD), and variable-diameter profiled seamless steel pipe (codenamed BJ). Shaped seamless tubes are widely used in a variety of structural parts, tools and mechanical parts. Compared with the round pipe, the special-shaped pipe generally has a large moment of inertia and a section modulus, and has a large bending and torsion resistance, which can greatly reduce the structural weight and save steel. Commonly used standard: cold drawn special-shaped steel pipe (GB/T 3094-2012).

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