A seamless tube is a long strip of steel with a hollow section and no seams around it.
From the perspective of both international and domestic markets, the existing production capacity of seamless pipes (including oil-specific pipes) has exceeded demand. Therefore, the focus in the future should be to give full play to the capabilities of existing units and develop products such as high-strength grades, high-resistance, high-corrosion-resistant oil pipes, high-pressure boiler tubes and gas cylinders.
A seamless tube is a long strip of steel with a hollow section and no seams around it.
From the perspective of both international and domestic markets, the existing production capacity of seamless pipes (including oil-specific pipes) has exceeded demand. Therefore, the focus in the future should be to give full play to the capabilities of existing units and develop products such as high-strength grades, high-resistance, high-corrosion-resistant oil pipes, high-pressure boiler tubes and gas cylinders.
First, seamless pipe process
Tube blank - inspection - stripping - inspection - heating - perforation - pickling - grinding - lubrication and air drying - welding head - cold drawing - solution treatment - pickling - pickling Passivation - inspection - cold rolling - oil removal - cutting head - air drying - internal polishing - external polishing - inspection - identification - finished packaging
Second, the classification of seamless pipes
1. Structural seamless pipe (GB/T8162-1999) is a seamless pipe for general structural and mechanical structures.
2. Seamless pipe for fluid transportation (GB/T8163-1999) is a general seamless pipe for conveying fluids such as water, oil and gas.
3. Low-medium pressure boiler seamless pipe (GB3087-1999) is used to manufacture superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes, large smoke pipes, small smoke pipes and arch bricks for various structures. Hot-rolled and cold-drawn (rolled) seamless pipes of high-quality carbon structural steel for pipe use.
4. High-pressure boiler seamless pipe (GB5310-1995) is a high-quality carbon steel, alloy steel and stainless steel heat-resistant seamless pipe for the heating surface of water tube boilers for high pressure and above.
5. High-pressure seamless pipe for chemical fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless pipe suitable for chemical equipment and pipelines with working temperature of -40~400 °C and working pressure of 10~30Ma.
6. Seamless pipe for petroleum cracking (GB9948-88) is a seamless pipe for furnace tubes, heat exchangers and pipes suitable for petroleum refineries.
7. Geological drilling steel pipe (YB235-70) is a steel pipe used for geological drilling by the geological department. It can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the application.
8. Diamond core drilling seamless pipe (GB3423-82) is a seamless pipe for drill pipe, core rod and casing for diamond core drilling.
9. Oil Drilling Seamless Pipe (YB528-65) is a seamless pipe used for thickening or external thickening at both ends of oil drilling. There are two kinds of steel pipe and no wire, the wire pipe is connected by a joint, and the non-wire pipe is welded by a butt welding method and a tool joint.
10. Carbon steel seamless pipe for ships (GB5213-85) is a carbon steel seamless pipe for the manufacture of ship class I pressure pipe system, class II pressure pipe system, boiler and superheater. 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 pipe for automobile semi-axle bushing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless pipe for manufacturing automobile semi-axle bushings and axles for drive axles.
12. High-pressure oil pipe for diesel engine (GB3093-86) is a cold-drawn seamless pipe for the manufacture of high-pressure pipes for diesel injection systems.
13. Precision Inner Diameter Seamless Pipe for Hydraulic and Pneumatic Cylinders (GB8713-88) is a cold drawn or cold rolled precision seamless pipe with precision inner diameter for hydraulic and pneumatic cylinders.
14. Cold-drawn or cold-rolled precision seamless pipe (GB3639-83) is a cold-drawn or cold-rolled precision seamless pipe with high dimensional accuracy and surface finish for mechanical structures and hydraulic equipment. The use of precision seamless pipes to manufacture mechanical structures or hydraulic equipment can greatly reduce machining time, improve material utilization, and improve product quality.
15. Structural stainless steel seamless pipe (GB/T14975-1994) is widely used in the chemical, petroleum, textile, medical, food, machinery and other industries of corrosion-resistant pipes and structural parts and parts of stainless steel (hot rolled) Squeeze, expand) and cold drawn (rolled) seamless tubes.
16. Stainless steel seamless pipe for fluid transportation (GB/T14976-1994) is a hot-rolled (extruded, expanded) and cold drawn (rolled) seamless pipe made of stainless steel for conveying fluid.
17. Shaped seamless pipe is a general term for seamless pipes of other 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 equal-wall thick profiled seamless pipe (code D), unequal wall thickness profiled seamless pipe (codenamed BD), and variable-diameter profiled seamless pipe (codenamed BJ). Shaped seamless tubes are widely used in a variety of structural parts, tools and mechanical parts. Compared with the round pipe, the special-shaped pipe generally has a large moment of inertia and a section modulus, and has a large bending and torsion resistance, which can greatly reduce the structural weight and save steel.
Third, the characteristics of seamless pipe
1. The outer diameter is smaller.
2. High precision can be done in small batches
3. The cold drawn product has high precision and good surface quality.
4. The cross-sectional area of ​​steel pipes is more complicated.
5. The steel pipe has better performance and the metal is denser.
Holster Gift Tape,Mini Round Retractable Tape Measure,Long Distance Round Retractable Tape Measure,Round Retractable Tape Measure
Shangqiu Jinda Tools Co.,Ltd , https://www.jindameasur.com