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Classification pipe

First, the classification of the pipe
1, according to the production method of classification
(1) seamless - hot-rolled tubes, cold-rolled, cold drawn tubes, squeeze tubes, pipe jacking
(2) pipe
(A) according to process sub - arc welded pipe, ERW pipe (high frequency, low frequency), gas pipe, stove pipe
(B) by the weld points - Longitudinal spiral welded pipe
2, according to a cross-sectional shape classification
(1) simple section steel - round pipe, square pipe, oval pipe, steel triangular, hexagonal steel, diamond steel, octagonal steel, steel semi-circle, the other
(2) section steel complex - equilateral hexagonal steel pipe, five plum-shaped pipe, steel double convex, double concave steel, oval-shaped steel conical pipe, corrugated steel pipe, steel case, other
3, according to the thickness classification
Thin-walled steel pipe, thick-walled steel pipe
Pipe
4. By Application
With steel pipe, steel pipe thermal equipment, industrial machinery with steel, petroleum, geological drilling steel, container steel, chemical industry with steel pipes, steel pipes for special purposes, other
Second, the seamless steel pipe

Is a hollow section, no seams around the long bar of steel. Steel hollow section, a large number of pipes used for transporting fluids, such as transportation of oil, gas, gas, water and some solid materials, pipes and so on. Compared to other steel and solid steel bar, the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle rack and construction using steel scaffolding. The ring with a steel pipe manufacturing parts, can improve material utilization, simplify the manufacturing process, saving materials and processing time, such as bearing rings, jack sets, has been widely used to manufacture steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel, etc. to make steel. Steel shapes in different cross-sectional area can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the largest area of a circle with a circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of pipe is pipe. (021-57590228)

However, the pipe also has some limitations, such as under the conditions by plane bending, tube as good as square, rectangular tube bending strength of a large number of farm machinery skeleton, steel and wood furniture on the common square and rectangular tube. Depending on the application needs to have shaped pipe other cross-sectional shapes.
1. Structure seamless steel pipe (GB / T8162-1999) is used for general structural and mechanical seamless steel structure.
2 fluid seamless steel pipe (GB / T8163-1999) is generally seamless for conveying water, oil, gas and other fluids.
3. The low-pressure boiler seamless steel pipe (GB3087-1999) is used in the manufacture of various structural low and medium pressure boiler superheated steam pipes, boiling water pipes and superheated steam locomotive boiler tubes, opium pipe, small pipe and brick arch effective high-quality carbon structural steel hot-rolled and cold drawn (rolled) seamless steel pipe.
4. High-quality carbon steel high-pressure boiler seamless pipe (GB5310-1995) is used to manufacture high-pressure and more pressure water tube boiler heating surface with steel, alloy steel and heat-resistant stainless steel seamless steel tubes.
5. fertilizer equipment, high pressure seamless steel pipe (GB6479-2000) is applicable to operating temperature -40 ~ 400 ℃, working pressure of high-quality carbon structural steel and alloy steel 10 ~ 30Ma of chemical equipment and seamless steel pipes.
6. petroleum cracking seamless pipe (GB9948-88) is applied to the oil refinery furnace tubes, heat exchangers and pipe seamless steel pipe.
7. Geological Drilling Pipe (YB235-70) for geological department of the steel core drilling used by applications can be divided into the drill pipe, drill collar, core pipe, casing and precipitation tubes.
8. Diamond core drilling seamless pipe (GB3423-82) is a drill, core rods used for diamond core drilling seamless steel pipe casing.
9. oil drilling pipe (YB528-65) is used to thicken the oil drilling within or outside the thick ends of seamless steel tubes. Steel sub-filaments and not two, Threading Pipe Fittings links, no threading methods and tools useful butt joint connection. (021-57590365)
10. ship carbon steel seamless pipe (GB5213-85) is to create Class I pressure vessels piping, Ⅱ grade pressure piping, boilers and Superheater carbon steel seamless pipe. Carbon steel seamless pipe wall temperature does not exceed 450 ℃, alloy steel seamless pipe wall temperature exceeds 450 ℃.
11. The automobile axle casing seamless steel pipe (GB3088-82) is the manufacture of automotive axle tube and axle axle shaft tubes of high-quality carbon structural steel and alloy steel hot-rolled seamless steel tubes.
12. diesel engine with high-pressure tubing (GB3093-2002) is to create high-pressure diesel injection systems of cold drawn seamless tubes.
13. The hydraulic and pneumatic cylinder with precision diameter seamless pipe (GB8713-88) is the manufacture of hydraulic and pneumatic cylinder with a drawn or cold rolled precision seamless steel pipe diameter size with precision.
14. Cold-drawn or cold rolled precision seamless steel (GB3639-2000) is a high dimensional accuracy for the mechanical structure, hydraulic equipment and good surface finish drawn or cold rolled precision seamless steel tubes.
Use precision seamless steel pipe manufacturing mechanical structure or hydraulic equipment, can greatly reduce machining time, improve material utilization, and help to improve the quality of products.
15. The structure of stainless steel seamless pipe (GB / T14975-2002) is widely used for hot-rolled chemical, petroleum, textile, medical, food, machinery and other industrial corrosion resistant pipes and structural parts and components made of stainless steel (extrusion, expansion) and cold drawn (rolled) seamless steel pipe.
16. The fluid transport stainless steel seamless pipe (GB / T14976-2002) is used for the transmission fluid hot-rolled stainless steel (extrusion, expansion) and cold drawn (rolled) seamless steel pipe.
17. Shaped seamless steel pipe in addition to other cross-sectional shape of the general term of seamless steel tubes. Press the pipe cross-section can be divided into different shapes and sizes and so shaped seamless steel pipe wall thickness (code D), ranging shaped seamless steel pipe wall thickness (codenamed BD), variable diameter seamless steel pipe shaped (codenamed BJ). Shaped seamless steel widely used in various structural parts, tools and mechanical parts. And the tube compared Pipes generally have a greater moment of inertia and section modulus, flexural torsional greater capacity, can greatly reduce the structural weight, saving steel.

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