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There are two types of seamless steel pipes: hot-rolled and cold-rolled (dial) seamless steel pipes.
Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.
In addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold-rolled (dial) seamless steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, Stainless steel thin-walled steel pipes, special-shaped steel pipes.
The outer diameter of hot-rolled seamless pipe is generally greater than 32mm, and the wall thickness is 2.5-75mm.
The outer diameter of cold-rolled seamless steel pipe can reach 6mm, and the wall thickness can reach 0.25mm.
The outer diameter of the thin-walled tube can reach 5mm and the wall thickness is less than 0.25mm. The dimensional accuracy of cold rolling is higher than that of hot rolling.
Specifications | quantity | Specifications | quantity | Specifications | quantity |
12×1.5 | 18 | 73×4-4.5-5-6-7-8-9-10-12-15 | 50 | 219×30-40 | 65 |
14×1.5-2.5-3 | 20 | 76×4-4.5-5-6-7-8-9-10-12-14 | 60 | 245×8-10-14-17-20-22 | 105 |
16×1.5-2.5-4 | 30 | 83×4.5-5-10-12-14-16-18-20 | 30 | 245×25-28-30-34-40 | 84 |
18×2.3-4-5 | 20 | 89×4.5-8-10-12-14-16-18-20 | 40 | 273×7-9-12-15-18-20-25 | 100 |
20×2.5-3-5 | 17 | 95×4.5-6-8-10-12-14-16-20 | 50 | 273×30-35-38-40 | 50 |
24×2.5-3-4-5-6 | 25 | 102×4.5-5-6-7-8-10-12-14-16-20 | 80 | 299×8-12-16-20-24-28 | 60 |
25×2.5-3-4-5-6 | 28 | 108×4.5-5-6-7-8-10-12-14-18-20-22 | 75 | 299×30-32-36-38-40 | 70 |
28×3-3.5-4-5-6 | 30 | 114×4.5-5-6-7-8-10-12-14-18-20 | 100 | 325×8-12-14-18-38 | 120 |
32×3.5-4-5-6-8 | 40 | 121×4.5-5-6-7-8-10-12-14-16-20 | 102 | 325×28-32-34-38 | 75 |
34×4-5-6-8 | 35 | 127×4.5-5-6-7-8-10-12-14-16-20 | 95 | 351×10-16-20-25-40 | 120 |
36×3.5-5-6-8 | 30 | 133×4.5-6-8-12-14-16-18-20-25-30 | 120 | 355×6-18-20-25-30-40 | 45 |
38×4-5-6-7-8-9-10 | 33 | 140×5-6-7-8-9-10-12-14-16-20-22 | 50 | 377×8-12-15-20-24-28 | 128 |
39×3.5-5-8-10 | 30 | 146×4.5-6-8-12-14-16-18-20-25-30 | 60 | 377×30-37-40 | 60 |
42×3.5-4-5-6-7-8-9-10 | 35 | 152×4.5-6-8-12-14-16-18-20-25-30 | 60 | 402×10-15-20-25-30-35 | 70 |
45×3.5-4-5-6-7-8-9 | 40 | 159×4.5-6-10-12-14 | 80 | 406×10-20-25-28-35-40 | 110 |
48×3.5-4-5-6-7-8-9-10 | 24 | 159×16-18-20-22-25-30 | 30 | 426×10-12-14-16-20-25-30-35-40 | 97 |
51×3.5-4-5-6-7-8-9-10 | 60 | 168×8-10-12-14-20-25-30-35 | 130 | 450×10-12-14-16-20-25-34-40 | 108 |
56×3.5-4-5-6-7-8-9-10 | 58 | 180×8-12-16-25-30 | 105 | 480×10-12-14-16-18-20-25-30-40 | 95 |
57×3.5-5-6-7-8-9-10-12 | 50 | 180×32-34-38-40 | 102 | 500×10-12-14-16-20-25-34-40 | 100 |
60×3.5-4.5-5-6-7-8-9-12-14 | 60 | 194×6-8-12-16-20-25-30-40 | 140 | 510×10-12-14-16-20-25-34-40 | 110 |
63×3.5-4.5-5-6-7-8-9-10-12-14 | 40 | 203×6-7-10-15-20-25-30 | 90 | 530×10-12-14-16-18-20-30-40 | 140 |
68×4-4.5-5-6-7-8-9-10-12-14-16 | 35 | 203×32-36-40 | 70 | ||
70×4-4.5-5-6-7-8-9-10-12-15-16 | 40 | 219×6-8-12-16-18-20-25 | 110 |
Structural seamless pipes (GB/T8162-2008) are seamless steel pipes used for general structures and mechanical structures.
Seamless steel pipes for fluid transportation (GB/T 8163-2018) are general seamless steel pipes used to convey fluids such as water, oil, and gas.
Seamless steel pipes for low and medium pressure boilers (GB3087-2008) are high-quality carbon structural steel hot-rolled and Cold drawn (rolled) seamless steel tubes.
High-pressure boiler seamless steel pipe (GB5310-2008) is a high-quality carbon steel, alloy steel and stainless heat-resistant seamless steel pipe for the heating surface of water tube boilers for high pressure and above.
Fertilizer equipment high-pressure seamless steel pipe (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with a working temperature of -40~400°C and a working pressure of 10~30Ma.
Seamless steel pipe for petroleum cracking (GB9948-2006) is a seamless steel pipe suitable for furnace tubes, heat exchangers and pipes in petroleum refineries.
Steel pipes for geological drilling (YB235-70) are steel pipes used for core drilling by geological departments.
Seamless steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe used for drill pipe, core rod and casing for diamond core drilling.
Oil drilling pipe (YB528-65) is a seamless steel pipe that is thickened inside or outside at both ends of oil drilling. There are two types of steel pipes: threaded and non-threaded. The threaded pipes are connected with joints, and the non-threaded pipes are connected with tool joints by butt welding.
Carbon steel seamless steel pipes for ships (GB5213-85) are carbon steel seamless pipes used in the manufacture of Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers and superheaters. The working temperature of the carbon steel seamless steel pipe wall does not exceed 450°C, and the working temperature of the alloy steel seamless steel pipe wall exceeds 450°C.
Seamless steel pipe for automobile half shaft casing (GB3088-82) is a hot-rolled seamless steel pipe of high-quality carbon structural steel and alloy structural steel for the manufacture of automobile half shaft casing and axle tube of drive axle.
High-pressure oil pipe for diesel engine (GB3093-2002) is a cold-drawn seamless steel pipe for manufacturing high-pressure pipe of diesel engine injection system.
Precision inner diameter seamless steel tubes for hydraulic and pneumatic cylinders (GB8713-88) are cold-drawn or cold-rolled precision seamless steel tubes with precise inner diameters for the manufacture of hydraulic and pneumatic cylinders.
Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-2000) 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 pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining hours, improve material utilization, and help improve product quality.
Structural stainless steel seamless steel pipe (GB/T14975-2002) is a hot-rolled (extruded, extruded, Expanded) and cold drawn (rolled) seamless steel tubes.
Stainless steel seamless steel pipes for fluid transportation (GB/T14976-2002) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipes made of stainless steel for fluid transportation.
Special-shaped seamless steel pipe is a general term for seamless steel pipes with cross-sectional shapes other than round pipes. According to the shape and size of the cross-section of the steel pipe, it can be divided into special-shaped seamless steel pipes with equal wall thickness (code-named D), special-shaped seamless steel pipes with different wall thickness (code-named BD), and special-shaped seamless steel pipes with variable diameter (code-named BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with round pipes, special-shaped pipes generally have a larger moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce the structural weight and save steel.
Seamless steel pipes for cryogenic pipes (GB/T18984-2003) are suitable for seamless steel pipes for -45°C to -195°C low-temperature pressure vessel pipes and low-temperature heat exchanger pipes.
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