(1) Seamless pipes-heat pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes and pipe jacking.
(2) welding pipes
(a) according to the process-arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe and furnace welded pipe.
(b) According to the weld-straight welded pipe and spiral welded pipe.
According to the cross-sectional shape
(1) Simple section steel pipes-round steel pipes, square steel pipes, oval steel pipes, triangular steel pipes, hexagonal steel pipes, diamond steel pipes, octagonal steel pipes, semicircular steel rings and others.
(2) Steel pipes with complex sections-equilateral hexagonal steel pipes, five-petal plum-blossom steel pipes, double convex steel pipes, double concave steel pipes, melon seeds steel pipes, conical steel pipes, corrugated steel pipes, watchcase steel pipes, etc.
According to caliber
According to the caliber classification, it can be divided into large-caliber seamless steel pipe and small-caliber seamless steel pipe.
By wall thickness
According to the wall thickness, it can be divided into thin-walled steel pipe and thick-walled steel pipe.
According to the purpose
Steel pipes for pipelines, thermal equipment, machinery industry, petroleum and geological drilling, containers, chemicals, special-purpose steel pipes and others.
(1) Pipe for pipeline. Such as: seamless pipes for water pipes, gas pipes, steam pipes, oil pipelines and oil and gas trunk lines. Water pipes for agricultural irrigation taps and sprinkler irrigation.
(2) Pipes for thermal equipment. Such as boiling water pipes and superheated steam pipes of general boilers, superheated pipes, large smoke pipes, small smoke pipes, arched brick pipes and high-temperature and high-pressure boiler tubes of locomotive boilers.
(3) Pipe for mechanical industry. Such as aviation structural tubes (round tubes, elliptical tubes and flat elliptical tubes), automobile semi-axle tubes, axle tubes, automobile tractor structural tubes, oil cooler tubes for tractors, square tubes, rectangular tubes for agricultural machinery, transformers and bearings.
(4) Pipes for petroleum geological drilling. Such as: petroleum drill pipes, petroleum drill pipes (square drill pipes and hexagonal drill pipes), drilling tappets, oil pipes, petroleum casings and various pipe joints, geological drill pipes (core pipes, casings, movable drill pipes, drilling tappets, clamping sleeves and pin joints, etc.). ).
(5) Pipe for chemical industry. Such as: petroleum cracking pipe, heat exchanger pipe, chemical equipment pipe, stainless acid-proof pipe, fertilizer high-pressure pipe, chemical medium conveying pipe, etc.
(6) Other departments use pipelines. Such as: tubes for containers (tubes for high-pressure gas cylinders and general containers), tubes for instruments, tubes for watch cases, injection needles and tubes for medical devices.
Press connect
Steel pipes can be divided into: smooth pipe (with no thread at the end) and turning pipe (with thread at the end) according to the connection mode of pipe ends.
Turning wire tube is divided into: ordinary turning wire tube and end thickening turning wire tube. Thickened steering tubes can be divided into external thickening (with external threads), internal thickening (with internal threads) and internal and external thickening (with internal and external threads). According to thread types, lathe tubes can also be divided into: ordinary cylindrical or conical threads and special threads.
In addition, according to the needs of users, automobile wire tubes are generally delivered with pipe joints.
The allowable deviation of standard outer diameter of seamless steel pipe size and allowable deviation grade is D 1 1.5%, and the minimum is 0.75mm D2 1.0%. The minimum value is 0.50 mm D3 0.75% and the minimum value is 0.30 mm D4 0.50%. Minimum 0. 10 mm name specification specification seamless pipe12 *1-kloc-0/.5-2.5 seamless pipe 70 * 4.5-5-6-7-8-9-10-/kloc. 8 seamless steel pipe 14* 1.5-2.5-3 seamless steel pipe 73 * 4-4.5-5-6-7-8-9-10-2-15 seamless steel pipe 277 8-20-25-3-45-60 Seamless Steel Pipe 8-120-25-30-40-52 Seamless Steel Pipe 24*2.5-3-4-5-6 Seamless Steel Pipe 95 * 4.5-8-10 4.5-5-7-8- 103-3.5-4-5-6 Seamless Pipe108 * 4.5-5-7-8-10/4-/kloc-0 3.5-4-5-6-8 Seamless Pipe14 * 4.5-5-6-7-12-16-18-20 Seamless Pipe 428 *10-. 6-20-25-30-35-40 Seamless Pipe 3.5-4-5-6-7-8-9- 10 Seamless Pipe15-6-8-12-14 8-654383.5-4-5-6-7-8-9-10 seamless pipe184 * 6-8-12-16-20-25-30-40 3.5-4-5-6-7-8-9-12-14 seamless pipe 200 * 6-7-10-15-20-26-30-45 seamless pipe 850 3.5-4.5-5-6-7-8-9-12-14 Seamless Pipe 219 * 6-8-12-16-.
It is a kind of long steel with hollow section, and there is no seam around it. Steel pipe has a hollow cross section and is widely used as a pipeline for conveying fluids (such as oil, natural gas, gas, water and some solid materials). Compared with solid steel such as round steel, steel pipe is lighter in weight under the same bending and torsion strength, and it is an economic section steel, which is widely used to manufacture structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle racks, steel scaffolding for construction, etc. Manufacturing annular parts with steel pipes can improve the utilization rate of materials, simplify the manufacturing process and save materials and processing time, such as rolling bearing rings and top sleeves. , widely used in steel pipe manufacturing. Steel pipe is also an indispensable material for all kinds of conventional weapons, and the barrel and barrel are made of steel pipe. According to the different cross-sectional shapes, steel pipes can be divided into round pipes and special-shaped pipes. Because the circular area is the largest when the circumference is equal, the circular tube can transport more fluid. In addition, when the circular section bears internal or external radial pressure, the force is relatively uniform, so steel pipes are mostly round pipes. However, circular tubes also have some limitations. For example, in the case of plane bending, the bending strength of circular tubes is not as high as that of square tubes and rectangular tubes, which are commonly used in some agricultural machinery skeletons and steel and wood furniture. According to different uses, special-shaped steel pipes with other cross-sectional shapes are needed.
1. Seamless Steel Pipe for Structure (GB/T8 162- 1999) is a seamless steel pipe for general structure and mechanical structure.
2. Seamless Steel Pipe for Fluid Transportation (GB/T8 163- 1999) is a common seamless steel pipe for conveying fluids such as water, oil and gas.
3. Seamless Steel Pipe for Medium and Low Pressure Boilers (GB3087- 1999) is a kind of high-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipe for manufacturing superheated steam pipes, boiling water pipes and superheated steam pipes of locomotive boilers with various structures.
4. Seamless Steel Pipe for High-pressure Boiler (GB53 10- 1995) is a kind of high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipe used to manufacture the heating surface of high-pressure and above water-tube boilers.
5. The high-pressure seamless steel pipe for fertilizer equipment (GB6479-86) is a kind of 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 (GB9948-88) is a kind of seamless steel pipe suitable for refinery tubes, heat exchangers and pipelines.
7. The steel pipe for geological drilling (YB235-70) is the steel pipe used for core drilling by the geological department, which can be divided into drill pipe, drill collar, core pipe, casing pipe and settling pipe according to the purpose.
8. Seamless Steel Pipe for Diamond Core Drilling (GB3423-82) is a seamless steel pipe for drill pipe, mandrel and casing for diamond core drilling.
9. Oil drilling pipe (YB528-65) is a kind of seamless steel pipe with both ends thickened internally or externally, which is used for oil drilling. There are two kinds of steel pipes: turning wire and non-turning wire. The turning wire is connected with the joint, and the non-turning wire is connected with the tool joint by butt welding.
10. Marine Carbon Steel Seamless Steel Pipe (GB52 13-85) is a kind of carbon steel seamless steel pipe used for manufacturing primary pressure-resistant piping system, secondary pressure-resistant piping system, boilers and marine superheaters. The working temperature of carbon steel seamless steel pipe wall shall not exceed 450℃, and the working temperature of alloy steel seamless steel pipe wall shall not exceed 450℃.
1 1. Seamless Steel Pipe for Automobile Bushing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe for manufacturing automobile bushings and axle housings.
12. Diesel Engine High Pressure Tubing (GB3093-86) is a cold-drawn seamless steel pipe for manufacturing diesel engine injection system high pressure tubing.
13. The precision inner diameter seamless steel pipe (GB87 13-88) for hydraulic cylinder and pneumatic cylinder is a kind of precision cold-drawn or cold-rolled seamless steel pipe with precision inner diameter.
14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83) is a precision cold-drawn or cold-rolled seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. Using precision seamless steel tube to manufacture mechanical structure or hydraulic equipment can greatly save processing time, improve material utilization and improve product quality.
15. Seamless Stainless Steel Pipe for Structure (GB/T 14975- 1994) is a hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipe made of stainless steel, which is widely used in chemical, petroleum, textile, medical, food, machinery and other industries.
16. Seamless Stainless Steel Pipe for Fluid Transportation (GB/T 14976- 1994) Hot rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipes made of stainless steel for fluid transportation.
17. Special-shaped seamless steel pipe is the general name of seamless steel pipe with other cross-sectional shapes except circular pipe. According to the different cross-sectional shapes and sizes of steel pipes, they can be divided into special-shaped seamless steel pipes with equal wall thickness (code D), special-shaped seamless steel pipes with unequal wall thickness (code BD) and special-shaped seamless steel pipes with variable diameter (code BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with circular tubes, special-shaped tubes generally have larger moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel.