Seamless steel tube with a hollow section, and the peripheral have no juncture of strip steel. Steel pipe is hollow section, a large number of used for the transmission fluid pipe, such as transport oil, natural gas, coal gas, water and some solid materials, such as pipelines. Hot-rolled steel tube and solid steel products such as compared to the same in bending wrest resistant intensity, light in weight, it is a kind of economic section steel, are widely used in the manufacturing of structural and mechanical parts, such as petroleum drill pipe, auto transmission shaft, bicycle frame and construction of steel used in construction scaffolding, etc. Use steel pipe manufacturing ring parts, can improve the material utilization, simplify the manufacturing process, saving material and processing time, such as rolling bearing collar, jack sets etc, it is widely with steel pipes to make. Steel pipe or all kinds of conventional weapons indispensable materials, * tube, cannon muzzles, are steel pipe to make. Steel pipe according to the cross-sectional area of the different shape can be divided into the pipe and irregular pipe. Because in circumference equal conditions, the largest area of round, with a round pipe can carry more fluid. In addition, the circle in section under internal or external radial stress, and stress is more homogeneous, therefore, most of the steel tube is pipe.
But, pipe have some limitations, such as by plane bending in the condition, the pipe is not as good as the party, rectangular tube bending strength, and some farm skeleton, gangmu furniture and used to party, rectangular tube. According to the different USES to other section of the shape of steel pipe.
1. The structure with seamless steel tube (GB/T8162-1999) is used in a general structure and mechanical structure of seamless steel tube.
2. Liquid transportation with seamless steel tube (GB/T8163-1999) is used to transport water, oil, gas and other fluid general seamless steel tube.
3. Low medium voltage boiler with seamless steel tube (GB3087-1999) is used in the manufacturing of various structure low medium voltage boiler superheated steam pipe, boiling water pipe and locomotive boiler superheated steam pipe, to spend time with little smoke a tube and tube, arch of high quality carbon structural steel work brick hot and cold drawing (rolling) seamless steel tube.
4. In high pressure boiler seamless steel tube (GB5310-1995) is used in the manufacturing of high pressure and above the water pipe pressure boiler of quality carbon steel, alloy steel with and stainless steel seamless steel tube heat.
5. Fertilizer equipment with high pressure seamless steel tube (GB6479-2000) is applied to work temperature of 40 ℃ ~ 400-working pressure of 10 to 30 Ma chemical equipment and piping of high quality carbon structural steel and alloy steel seamless steel tube.
6. Petroleum cracking with seamless steel tube (GB9948-88) is used in oil refinery furnace tube heat exchanger and pipe, seamless steel tube.
7. Geological drilling with steel tube (YB235-70) is for the geological department of the core drilling use steel pipe, according to use can be divided into drill pipe, the drill collar, core pipe, casing and precipitation pipe, etc.
8. Diamond core drilling with seamless steel tube (GB3423-82) is used for diamond core drill pipe, drilling core pole, casing of seamless steel tube.
9. Oil drilling pipe (YB528-65) is used in oil drilling in outer thickening thick or both ends of seamless steel tube. Steel wire and car car runs two wire, wire connection works joint car, car silk works the methods and tools butt weld joint coupling.
10. Ship with carbon steel seamless steel tube (GB5213-85) is manufacturing ship level I pressure pipe, Ⅱ level compression tube system, boiler and the carbon steel seamless steel tube is overheating. Carbon steel seamless steel tube wall temperature not over 450 ℃ work, alloy steel seamless steel tube wall working temperature more than 450 ℃.
11. Car half collar work seamless steel tube (GB3088-82) is make cars and a half drive axle of tube and shell bridge are useful shaft high quality carbon structural steel and alloy rolling seamless steel tube.
12. Diesel engine by using the high-pressure tube (GB3093-2002) is making biodiesel fuel injection system of high pressure useful cold drawn seamless steel tube.
13. Hydraulic and pneumatic cylinder with inner diameter precision seamless steel tube (GB8713-88) is manufacture hydraulic and pneumatic cylinder with inner diameter size with precision cold drawn or cold rolling precision seamless steel tube.
14. Cold drawing or cold rolling precision seamless steel tube (GB3639-2000) is used for mechanical structure, hydraulic pressure equipment size high precision and good surface finish of cold drawn or cold rolling precision seamless steel tube.
Choose precision seamless steel pipe manufacturing machinery structure or hydraulic equipment and so on, can greatly reduce mechanical processing hour and improve material utilization, and to improve the quality of products.
15. Structure in stainless steel seamless steel tube (GB/T14975-2002) is widely used in chemical industry, petroleum, light textile, medical, food, machinery, and other industrial corrosion pipe and construction parts and parts of the stainless steel rolling (crowded, expanding and cold drawing (rolling) seamless steel tube.
16. Liquid transportation use stainless steel seamless steel tube (GB/T14976-2002) is used for the transmission fluid of the stainless steel rolling (crowded, expanding and cold drawing (rolling) seamless steel tube.
17. Alien seamless steel tube is besides pipe outside of the other section of the floorboard of seamless steel tube shape. According to the steel tube cross-section shape size can be divided into different and wall thickness and different seamless steel tube (code D), differ wall thickness of seamless steel tube (code for BD), change of seamless steel tube diameter (code BJ). Alien seamless steel tube is widely used for various structural components, tools and machinery spare parts. And compared with round pipe, irregular pipe generally has large inertia and section modulus, have bigger bending wrest resistant ability, can greatly reduce weight structure, save steel seamless steel tube prices.