seamless steel pipe is a hollow cross section, surrounded by long steel joints. Steel hollow sections, a large number for a pipe conveying fluid, such as the transportation of oil, gas, gas, water and some solid materials, pipes, etc.. Such as steel pipe and round bar of solid steel compared to 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 transmission, bicycles frame construction using steel scaffolding. Steel pipe manufacturing annular parts, can increase the material utilization, simplify the manufacturing process, saving material and machining time, such as rolling bearing rings, jack sets, has been widely manufactured steel pipe. Steel pipe or a variety of conventional weapons, an indispensable material, barrel, barrel must be steel pipe manufacturing. The steel pipe according to the different cross-sectional area shape can be divided into tube and Yixingguan. More fluid can be transported under the same conditions in the perimeter area of a circle, with a round tube. In addition, the ring cross section to withstand internal or external radial pressure force is more uniform, so the vast majority of steel pipe is a tube.
However, the tube also has some limitations, under the conditions of the plane bending, the tube is not as good as square, rectangular tube bending strength, on the common side of farm machinery skeleton, steel and wood furniture, rectangular tube. According to different uses, should also have other cross-section shape of the shaped pipe.
(1) the structure seamless steel pipe (GB/T8162- 1999) is used for general structural and mechanical structure of seamless steel pipe.
Fluid conveying general seamless steel pipe for conveying water, oil, gas and other fluid with seamless steel pipe (GB/T8163-1999).
Low and medium pressure boiler seamless steel pipe (GB3087-1999) is used in the manufacture of a variety of structures is low and medium pressure boiler superheated steam, boiling water pipe and locomotive boiler superheated steam pipe, opium pipe, small pipe and arch brick tubes of quality carbon structural steel hot-rolled and cold drawn (rolled) seamless steel pipe.
(4) high-pressure boiler seamless pipe (GB5310-1995) is used in the manufacture of high pressure and over pressure water tube boiler heating surface with high-quality carbon steel, alloy steel and heat-resistant stainless steel seamless. (Steel, net www.gangcai.com)
Fertilizer equipment with high-pressure seamless steel pipe (GB6479-2000) is applicable to operating temperature -40 ~ 400 ℃, working pressure of 10 ~ 30Ma chemical equipment and pipeline quality carbon structural steel and alloy steel seamless steel pipe.
Petroleum cracking seamless steel pipe (GB9948-88) is applicable to the oil refinery furnace tubes, heat exchangers and pipe seamless steel pipe.
7 geological drilling pipe (YB235-70) for the geological department core drilling, use of steel pipes, can be divided by end-use drill pipe, drill collars, the core pipe, casing and precipitation tubes.
8 diamond core drilling with seamless steel pipe (GB3423-82) is used for diamond core drilling, drill pipe, seamless steel tubes of the core rod, casing.
Oil drilling pipe (YB528-65) is used to thicken or external upset oil drilling at both ends of seamless steel pipe. Steel tube sub-threading and threading two Threading Pipe Fittings links, non-threading works butt links with the tool joints.
The ship carbon steel seamless steel pipe (GB5213-85) is to create a pressure pipe system of ships Class I, class II pressure piping, boilers, and overheating of the uses of carbon steel seamless steel pipe. Carbon steel seamless pipe wall temperature does not exceed 450 ° C, alloy steel seamless pipe wall temperature over 450 ℃.
11 automobile axle casing seamless steel pipe (GB3088-82) is the manufacture of automobile axle casing and the drive axle shell axis effective quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe.
12 engine manufacture diesel injection system, high pressure pipes cold-drawn seamless steel pipe with high-pressure tubing (GB3093-2002).
13 hydraulic and pneumatic cylinder with precision internal diameter seamless steel pipe (GB8713-88) is used in the manufacture of hydraulic and pneumatic cylinder with precision inner diameter cold drawn or cold rolled precision seamless steel tubes.
14 cold drawn or cold rolled precision seamless steel pipe (GB3639-2000) is used for mechanical structure, hydraulic equipment, high dimensional accuracy and surface finish, good cold drawn or cold rolled precision seamless steel tubes. Use precision seamless steel tube manufacturing mechanical structure or hydraulic equipment, etc., can greatly reduce the mechanical processing time, improve material utilization, and help to improve the product quality.
15 structure is widely used in chemical, petroleum, textile, medical, food, machinery and other industrial corrosion of piping and structural parts and components made of stainless steel hot-rolled (with stainless steel seamless pipe (with GB/T14975-2002) extrusion, expansion) and cold drawn (rolled) seamless steel tubes.
16 fluid transport stainless steel seamless pipe (GB/T14976-2002) is used for the transmission fluid made of stainless steel, hot rolled (extrusion, expansion) and cold drawn (rolled) seamless steel pipe.
17 Shaped seamless steel pipe is the general term in addition to the sectional shape other than round tube, seamless steel pipe. Shaped seamless steel pipe wall thickness according to different shapes and sizes of steel pipe cross-section can be divided into (code D), ranging from wall thickness of the shaped seamless steel tubes (code BD) variable diameter Shaped seamless steel pipe (code for the BJ). Shaped seamless steel tubes are widely used in various structural parts, tools and mechanical parts. And tube, Special Pipes generally have a greater moment of inertia and cross-section modulus, flexural and torsional capacity, can greatly reduce the structural weight saving steel.