Method of manufacturing large-diameter seamless steel tube

A technology of seamless steel pipes and manufacturing methods, applied in the manufacture of steel pipes and the field of manufacturing large-diameter seamless steel pipes

Inactive Publication Date: 2009-02-04
潘克云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no large-diameter seamless steel pipe with

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1 Manufacture of seamless steel pipes with an outer diameter of Φ1219mm, a wall thickness of 16mm and a length of 12000mm

[0018] (1) Selection and treatment of the parent pipe: choose a medium-diameter straight seam welded steel pipe with an outer diameter of Φ610mm, a wall thickness of 17.5mm and a length of 22000mm as the parent pipe, and remove internal and external burrs, intermediate frequency weld annealing, pipe body and welding seam inspection;

[0019] (2) Thermal expansion: using the push-type expansion method, the main tube is heated to 940 ℃ by intermediate frequency induction, and an expanding mandrel is placed inside. The intermediate frequency heating induction coil and the expanding mandrel are fixed. Push the steel pipe through the expanding mandrel to realize the diameter expansion of the steel pipe. After the first pass of intermediate frequency induction heating, push and heat expansion will become an intermediate tube with an outer diamete...

Example Embodiment

[0022] Example 2 Manufacture of seamless steel pipes with an outer diameter of Φ1240mm, a wall thickness of 20mm and a length of 12000mm

[0023] (1) Selection and treatment of the parent pipe: Select a medium-diameter straight seam welded steel pipe with an outer diameter of Φ610mm, a wall thickness of 17.5mm and a length of 22000mm as the parent pipe, and remove internal and external burrs, intermediate frequency weld annealing, pipe body and welding seam inspection;

[0024] (2) Thermal expansion: The drawing-type expansion method is used to heat the main pipe to a temperature above 945°C with an intermediate frequency induction, and an expansion mandrel is placed inside, the steel pipe is fixed, and the intermediate frequency heating induction coil moves at the same time as the expansion mandrel. Moving, the expanding mandrel realizes the diameter expansion of the steel pipe body under the pulling of the drawing host, and the first pass of intermediate frequency induction ...

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Abstract

The invention relates to a manufacture method for a seamless steel pipe of a large caliber. In the method, a straight-seam welding steel pipe with an outer diameter of Phi 508mm to Phi610mm is selected as a main pipe, is processed into a main pipe without defects, becomes a crude tube with outer diameter of Phi 620mm to Phi1400mm through at least one thermal diameter expanding, becomes a crude steel pipe an outer diameter of Phi 630mm to Phi1422mm through cold diameter expanding and straightening and finally the finished product of the seamless steel pipe of a large caliber is obtained by carrying out the fine processing like pipe end processing, water pressure test, pipe end flaw detection, pipe body flaw detection, length detecting, weighting as well as spraying, printing and oil coating on the crude steel pipe. The method not only can produce the seamless steel pipe of a large caliber without welding lines, replace UOE and JCOE, but also has a lower cost and a high production efficiency; the product of the invention can be directly used for conveying oil and gas.

Description

technical field [0001] The invention relates to a method for manufacturing a steel pipe, in particular to a method for manufacturing a large-diameter seamless steel pipe, and belongs to the field of iron and steel metallurgy. Background technique [0002] Large-diameter seamless steel pipes refer to steel pipes with an outer diameter of Φ630mm~Φ1422mm, a wall thickness of 6mm~25.4mm, and a length of 6000mm~12000mm, mainly including spiral submerged arc welded pipes, straight seam submerged arc welded pipes, and butt welded pipes for plate rolling machines. . Among them, the forming quality of the butt welded pipe of the plate rolling machine is poor, the precision of the outer diameter of the steel pipe is poor, there are many welds and the efficiency is low, and it is not suitable for mass production. The production efficiency of the spiral submerged arc welded pipe is 1.0-2.0 m / min, but because the length of the weld is 1.5-2.5 times that of the straight seam submerged ar...

Claims

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Application Information

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IPC IPC(8): F16L9/02
Inventor 潘克云
Owner 潘克云
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