Method for manufacturing large-diameter thick-wall seamless steel pipe

A seamless steel pipe and manufacturing method technology, applied in the field of iron and steel smelting, can solve the problem of high steel pipe price, achieve the effect of steel pipe quality satisfaction and obvious cost competitive advantage

Inactive Publication Date: 2010-10-20
雷丙旺
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of equipment capacity, the piercing drawing process and vertical extrusion process have limitations in the variety and specification of steel pipes
In particular, only a small number of enterprises have production capacity for the above three processes, and the price of steel pipes is relatively high.

Method used

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  • Method for manufacturing large-diameter thick-wall seamless steel pipe
  • Method for manufacturing large-diameter thick-wall seamless steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] For example, to produce steel pipes of φ1200x60x6500mm

[0022] 1. Two steel pipes of φ580x90x5000mm can be selected;

[0023] 2. Joint preparation, the flatness of the butt joint surface is ≤0.1mm, and the perpendicularity to the axis of the steel pipe is ≤0.15mm;

[0024] 3. Use a friction welding machine to butt the steel pipe into a tube blank of φ580x90x10000mm;

[0025] 4. Trim the flash generated by friction welding, and smooth the weld flash and the inner and outer surfaces of the steel pipe;

[0026] 5. Non-destructive testing of welds is required to be carried out in accordance with the flaw detection standards of finished steel pipes;

[0027] 6. Use the push pipe expander to expand the diameter of the pipe blank after butt jointing to φ1200x60x6550mm in 4 passes, and the diameter expansion ratio of each pass is about 1.2;

[0028] 7. Heat treatment;

[0029] 8. Calibrate and finish the steel pipes that have passed the heat treatment to meet the size requ...

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Abstract

The invention relates to a method for manufacturing a large-diameter thick-wall seamless steel pipe, which belongs to the field of iron and steel smelting. The method is widely applied to forming a process for manufacturing a large-diameter thick-wall seamless steel pipe which meets the quality requirement on a high-quality steel pipe without extra-heavy type forging and pressing equipment by combining a friction welding technology and a push pipe expanding technology of industries of aerospace, automobiles, petrochemical industry, nuclear power, and the like. Thick-wall steel pipes with the diameter below 700mm are butted into a pipe blank with a certain length by adopting friction welding, and the butted pipe blank is expanded into a demanded specification on a push pipe expanding machine. The large-diameter thick-wall seamless steel pipe which is made of different materials, such as carbon structure, steel alloy structural steel, heat resistant steel, and the like and has different specifications of the outer diameter more than 720mm, the wall thickness 20-130mm and the length not larger than 12,500mm can be produced by adopting the method. The invention can greatly reduce the equipment investment and the production and manufacture cost.

Description

technical field [0001] The invention relates to a method for manufacturing a large-diameter thick-walled seamless steel pipe, belonging to the field of iron and steel smelting. Background technique [0002] With the continuous development of the economy, the manufacturing capacity of large-diameter thick-walled seamless steel pipes has increased rapidly. At present, the supply of large-diameter thick-walled seamless steel pipes below φ700mm and wall thickness 20-130mm exceeds demand, and the price continues to drop. As for large-diameter thick-walled seamless steel pipes with a diameter of 700mm or more and a length of more than 6000mm, since they cannot be made by Pilger, three main processes are used for production: ①Forging (Conventional Technology, that is, free forging), which requires 6000 tons-12000 large-scale forging Equipment, manufacturers with equipment capabilities can produce. ②Piercing and drawing (Manesmamm Technology, that is, German Mannesmann type), requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08
Inventor 雷丙旺
Owner 雷丙旺
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