First, the classification of pipe
1, according to production methods
(1) seamless tube - hot rolled tube, cold rolled tube, cold drawn tube, extruded tube, top tube
(2) welded pipe
(a) According to the process - arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace pipe
(b) According to the weld - straight seam welded pipe, spiral welded pipe
2. Classified by section shape
(1) Simple section steel pipe - round steel pipe, square steel pipe, oval steel pipe, triangular steel pipe, hexagonal steel pipe, diamond steel pipe, octagonal steel pipe, semi-circular steel ball, other
(2) Steel tubes with complex sections - unequal hexagonal steel pipe, five-fractured plumbular steel pipe, double convex steel pipe, double concave steel pipe, melon-shaped steel pipe, conical steel pipe, corrugated steel pipe, case steel pipe, and others
3, classified by wall thickness - thin-walled steel pipe, thick-walled steel pipe
4. Classification according to purpose: Pipes for pipes, steel pipes for thermal equipment, steel pipes for machinery industry, steel pipes for petroleum, geological drilling, container steel pipes, steel pipes for chemical industry, special-purpose steel pipes, and others
Second, seamless steel pipe
Seamless steel pipe is a long strip steel with a hollow section and no joints around it. The steel pipe has a hollow cross-section and is used in large quantities as a pipe for conveying fluids, such as pipes for transporting petroleum, natural gas, coal gas, water, and certain solid materials. Compared with solid steel such as round steel, steel pipes have a lighter weight when subjected to the same flexural and torsional strength, and are economical cross-section steels. They are widely used in the manufacture of structural and mechanical parts such as oil drill pipes, automobile transmission shafts, and bicycles. Frames and steel scaffolds used in construction. The use of steel pipes for the manufacture of annular parts can increase the material utilization, simplify the manufacturing process, save material and processing man-hours, such as rolling bearing rings, jack sleeves, etc. Currently, steel pipes are widely used for manufacturing. Steel pipe is also an indispensable material for various conventional weapons. The barrels, barrels, etc. must be made of steel pipes. Steel tubes can be divided into round tubes and shaped tubes according to the shape of the cross-sectional area. Since the circle area is the largest under the condition of the same circumference, more fluid can be transported by the circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is more uniform. Therefore, most steel tubes are round tubes. However, the circular tube also has certain limitations. For example, under the conditions of plane bending, the circular tube is not as strong as the rectangular or rectangular tube, and some agricultural machinery skeletons, steel-wood furniture, etc., are commonly used and rectangular tubes. According to different uses also need to have other cross-sectional shape of the special-shaped steel pipe.
1. Structural seamless steel pipe (GB/T8162-1999) is a seamless steel pipe used for general structure and mechanical structure.
2. Seamless steel pipe for fluid transport (GB/T8163-1999) is a general seamless steel pipe used to transport fluids such as water, oil, and gas.
3. Seamless steel tubes for low and medium pressure boilers (GB3087-1999) are used to manufacture superheated steam tubes, boiling water tubes and superheated steam tubes for boilers of various types of low and medium pressure boilers, large smoke tubes, small smoke tubes and arch bricks. High-quality carbon structural steel for hot-rolled and cold drawn (rolled) seamless steel tubes.
4. Seamless steel tubes for high-pressure boilers (GB5310-1995) are high-quality carbon steel, alloy steel and stainless heat-resisting seamless steel tubes for the heating surface of water-tube boilers used to produce high pressure and above pressure.
5. High-pressure seamless steel tubes for chemical fertilizer equipment (GB6479-86) are high-quality carbon structural steel and alloy steel seamless tubes suitable for chemical equipment and pipelines with an operating temperature of -40 to 400 °C and a working pressure of 10 to 30 Ma.
6. Seamless steel pipe for petroleum cracking (GB9948-88) is a seamless steel pipe for furnace tubes, heat exchangers and pipes in petroleum refining plants.
7. The geological drilling steel pipe (YB235-70) is a steel pipe used by the geological department for core drilling. It can be divided into drill pipes, drill collars, core pipes, casing pipes and sedimentation pipes according to the purpose.
8. The seamless steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe for drill pipe, core bar and casing of diamond core drilling.
9. The oil drilling pipe (YB528-65) is a seamless steel pipe that is thickened or thickened at both ends of the oil drilling. The steel pipe is divided into two types, namely the sub-car wire and the non-car wire, and the wire pipe is connected with the joint. The butt welding method of the wire car pipe is connected with the tool joint.
10. Carbon steel seamless steel tubes for ships (GB5213-85) are carbon steel seamless tubes for the production of Class I pressure piping systems, Class II pressure piping systems, boilers and superheaters for ships. The working temperature of carbon steel seamless pipe wall does not exceed 450 °C, and the working temperature of alloy steel seamless pipe wall exceeds 450 °C.
11. Seamless steel tubes for automotive axle bushings (GB3088-82) are high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes for the manufacture of automotive axle bushings and axle tubes for drive axles.
12. The high-pressure fuel pipe for diesel engine (GB3093-86) is a cold-drawn seamless steel pipe for the high-pressure pipe of the diesel injection system.
13. Precision inner diameter seamless steel tubes (GB8713-88) for hydraulic and pneumatic cylinders are precision-drawn or cold-rolled precision seamless steel tubes with precision inner diameter dimensions for the manufacture of hydraulic and pneumatic cylinders.
14. Cold-drawn or cold-rolled precision seamless steel tubes (GB3639-83) are cold-drawn or cold-rolled precision seamless steel tubes for mechanical structures and hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision seamless steel pipe manufacturing machinery structures or hydraulic equipment, etc., can greatly reduce the mechanical processing time, improve the material utilization, and help improve product quality.
15. Structural stainless steel seamless pipes (GB/T14975-1994) are hot-rolled stainless steels that are widely used in corrosion resistant pipes and structural parts and components in the chemical, petroleum, textile, medical, food, and machinery industries. Squeeze, expand) and cold drawn (rolled) seamless steel tubes.
16. Stainless steel seamless pipes for fluid transport (GB/T14976-1994) are hot rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipes made of stainless steel for conveying fluids.
17. Shaped seamless steel tubes are the general term for seamless steel tubes of other cross-sectional shapes other than round tubes. According to the different shapes and sizes of steel tubes, they can be divided into equal-wall thickness special-shaped seamless steel tubes (code D), unequal wall thickness shaped seamless steel tubes (code-named BD) and variable-diameter special-shaped seamless steel tubes (coded as BJ). Shaped seamless steel tubes are widely used in various structural parts, tools and mechanical parts. Compared with round tubes, shaped tubes generally have larger moments of inertia and section modulus, and have greater resistance to bending and torsion, which can greatly reduce the structural weight and save steel.
1, according to production methods
(1) seamless tube - hot rolled tube, cold rolled tube, cold drawn tube, extruded tube, top tube
(2) welded pipe
(a) According to the process - arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace pipe
(b) According to the weld - straight seam welded pipe, spiral welded pipe
2. Classified by section shape
(1) Simple section steel pipe - round steel pipe, square steel pipe, oval steel pipe, triangular steel pipe, hexagonal steel pipe, diamond steel pipe, octagonal steel pipe, semi-circular steel ball, other
(2) Steel tubes with complex sections - unequal hexagonal steel pipe, five-fractured plumbular steel pipe, double convex steel pipe, double concave steel pipe, melon-shaped steel pipe, conical steel pipe, corrugated steel pipe, case steel pipe, and others
3, classified by wall thickness - thin-walled steel pipe, thick-walled steel pipe
4. Classification according to purpose: Pipes for pipes, steel pipes for thermal equipment, steel pipes for machinery industry, steel pipes for petroleum, geological drilling, container steel pipes, steel pipes for chemical industry, special-purpose steel pipes, and others
Second, seamless steel pipe
Seamless steel pipe is a long strip steel with a hollow section and no joints around it. The steel pipe has a hollow cross-section and is used in large quantities as a pipe for conveying fluids, such as pipes for transporting petroleum, natural gas, coal gas, water, and certain solid materials. Compared with solid steel such as round steel, steel pipes have a lighter weight when subjected to the same flexural and torsional strength, and are economical cross-section steels. They are widely used in the manufacture of structural and mechanical parts such as oil drill pipes, automobile transmission shafts, and bicycles. Frames and steel scaffolds used in construction. The use of steel pipes for the manufacture of annular parts can increase the material utilization, simplify the manufacturing process, save material and processing man-hours, such as rolling bearing rings, jack sleeves, etc. Currently, steel pipes are widely used for manufacturing. Steel pipe is also an indispensable material for various conventional weapons. The barrels, barrels, etc. must be made of steel pipes. Steel tubes can be divided into round tubes and shaped tubes according to the shape of the cross-sectional area. Since the circle area is the largest under the condition of the same circumference, more fluid can be transported by the circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is more uniform. Therefore, most steel tubes are round tubes. However, the circular tube also has certain limitations. For example, under the conditions of plane bending, the circular tube is not as strong as the rectangular or rectangular tube, and some agricultural machinery skeletons, steel-wood furniture, etc., are commonly used and rectangular tubes. According to different uses also need to have other cross-sectional shape of the special-shaped steel pipe.
1. Structural seamless steel pipe (GB/T8162-1999) is a seamless steel pipe used for general structure and mechanical structure.
2. Seamless steel pipe for fluid transport (GB/T8163-1999) is a general seamless steel pipe used to transport fluids such as water, oil, and gas.
3. Seamless steel tubes for low and medium pressure boilers (GB3087-1999) are used to manufacture superheated steam tubes, boiling water tubes and superheated steam tubes for boilers of various types of low and medium pressure boilers, large smoke tubes, small smoke tubes and arch bricks. High-quality carbon structural steel for hot-rolled and cold drawn (rolled) seamless steel tubes.
4. Seamless steel tubes for high-pressure boilers (GB5310-1995) are high-quality carbon steel, alloy steel and stainless heat-resisting seamless steel tubes for the heating surface of water-tube boilers used to produce high pressure and above pressure.
5. High-pressure seamless steel tubes for chemical fertilizer equipment (GB6479-86) are high-quality carbon structural steel and alloy steel seamless tubes suitable for chemical equipment and pipelines with an operating temperature of -40 to 400 °C and a working pressure of 10 to 30 Ma.
6. Seamless steel pipe for petroleum cracking (GB9948-88) is a seamless steel pipe for furnace tubes, heat exchangers and pipes in petroleum refining plants.
7. The geological drilling steel pipe (YB235-70) is a steel pipe used by the geological department for core drilling. It can be divided into drill pipes, drill collars, core pipes, casing pipes and sedimentation pipes according to the purpose.
8. The seamless steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe for drill pipe, core bar and casing of diamond core drilling.
9. The oil drilling pipe (YB528-65) is a seamless steel pipe that is thickened or thickened at both ends of the oil drilling. The steel pipe is divided into two types, namely the sub-car wire and the non-car wire, and the wire pipe is connected with the joint. The butt welding method of the wire car pipe is connected with the tool joint.
10. Carbon steel seamless steel tubes for ships (GB5213-85) are carbon steel seamless tubes for the production of Class I pressure piping systems, Class II pressure piping systems, boilers and superheaters for ships. The working temperature of carbon steel seamless pipe wall does not exceed 450 °C, and the working temperature of alloy steel seamless pipe wall exceeds 450 °C.
11. Seamless steel tubes for automotive axle bushings (GB3088-82) are high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes for the manufacture of automotive axle bushings and axle tubes for drive axles.
12. The high-pressure fuel pipe for diesel engine (GB3093-86) is a cold-drawn seamless steel pipe for the high-pressure pipe of the diesel injection system.
13. Precision inner diameter seamless steel tubes (GB8713-88) for hydraulic and pneumatic cylinders are precision-drawn or cold-rolled precision seamless steel tubes with precision inner diameter dimensions for the manufacture of hydraulic and pneumatic cylinders.
14. Cold-drawn or cold-rolled precision seamless steel tubes (GB3639-83) are cold-drawn or cold-rolled precision seamless steel tubes for mechanical structures and hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision seamless steel pipe manufacturing machinery structures or hydraulic equipment, etc., can greatly reduce the mechanical processing time, improve the material utilization, and help improve product quality.
15. Structural stainless steel seamless pipes (GB/T14975-1994) are hot-rolled stainless steels that are widely used in corrosion resistant pipes and structural parts and components in the chemical, petroleum, textile, medical, food, and machinery industries. Squeeze, expand) and cold drawn (rolled) seamless steel tubes.
16. Stainless steel seamless pipes for fluid transport (GB/T14976-1994) are hot rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipes made of stainless steel for conveying fluids.
17. Shaped seamless steel tubes are the general term for seamless steel tubes of other cross-sectional shapes other than round tubes. According to the different shapes and sizes of steel tubes, they can be divided into equal-wall thickness special-shaped seamless steel tubes (code D), unequal wall thickness shaped seamless steel tubes (code-named BD) and variable-diameter special-shaped seamless steel tubes (coded as BJ). Shaped seamless steel tubes are widely used in various structural parts, tools and mechanical parts. Compared with round tubes, shaped tubes generally have larger moments of inertia and section modulus, and have greater resistance to bending and torsion, which can greatly reduce the structural weight and save steel.
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