Method for producing super-thick plate by packrolling welding process

A technology of super-thick plate and stack rolling welding, which is applied in the field of steel rolling in the metallurgical industry, can solve the problems of high cost and cumbersome debugging, and achieve the effect of low cost, good internal quality and high yield

Inactive Publication Date: 2011-04-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although vacuum electron beam welding can well complete the vacuum and sealing treatment of the gap between combined blocks, it is cumbersome

Method used

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  • Method for producing super-thick plate by packrolling welding process
  • Method for producing super-thick plate by packrolling welding process
  • Method for producing super-thick plate by packrolling welding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: The ordinary Q345 continuous casting slab is used to produce a 150mm extra-thick plate.

[0028] The continuous casting slab was cut into two billets with dimensions of 250mm×2500mm×2500mm by flame cutting. figure 1 Process flow chart of surface cleaning-welding blank assembly-vacuumizing-sealing designed for the present invention. Use a gantry planer to remove the iron oxide scale on the surface of the two blocks to be bonded, and then blow off the surface with compressed air; align and overlap the two blocks, and fasten them on the trolley, and use an argon arc welding machine for compounding The welding seal around the gap leaves a 10mm long opening at one end, and then welds a soft steel pipe on the opening (the thickness of the pipe wall is above 3mm to ensure sufficient compression during pressing); use a vacuum pump to pump through the steel pipe Vacuum to 1×10 -2 pa, finally use hydraulic pliers to press and seal the steel pipe (shorten the lengt...

Embodiment 2

[0029] Embodiment 2: An extra-thick plate of 250 mm is produced by using ordinary Q345 continuous casting slab.

[0030] Cut the continuous casting slab into three pieces of 250mm×2500mm×2500mm by flame cutting; use the gantry planer to remove the iron oxide scale on the surface of the two pieces of slabs to be joined, and then blow off the surface with compressed air; Align, superimpose, and fasten on the trolley, use argon arc welding machine to weld and seal around the two composite gaps, leave a 10mm long opening at one end of each composite surface, and then weld a thicker material on the opening. Soft steel pipe (thickness of the pipe wall is more than 3mm to ensure sufficient compression during pressing); use a vacuum pump to evacuate through the steel pipe to 1×10 -2 pa, finally use hydraulic pliers to press and seal the steel pipe (shorten the length of the steel pipe on the combined slab as far as possible, and stop the vacuum pump after pressing), and seal the press...

Embodiment 3

[0031] Embodiment 3: A 150mm extra-thick plate is produced by continuously casting a low-carbon bainitic steel slab.

[0032] Cut the continuous casting slab into three pieces of 150mm×2500mm×2500mm by flame cutting; use the gantry planer to remove the iron oxide scale on the surface of the two pieces of slabs to be joined, and then blow off the surface with compressed air; Align, superimpose, and fasten on the trolley, use argon arc welding machine to weld and seal around the two composite gaps, leave a 10mm long opening at one end of each composite surface, and then weld a thicker material on the opening. Soft steel pipe (thickness of the pipe wall is more than 3mm to ensure sufficient compression during pressing); use a vacuum pump to evacuate through the steel pipe to 1×10 -2 Pa, finally use hydraulic tongs to press and seal the steel pipe (shorten the length of the steel pipe on the combined slab as much as possible, and stop the vacuum pump after pressing), and seal the ...

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Abstract

The invention discloses a method for producing a super-thick plate by a packrolling welding process, which mainly comprises the steps of: cutting the continuously cast blank, cleaning surface of the blank blocks, aligning and overlaying the blank blocks in same size, welding the surrounding of the combined surface after the blank blocks are fastened, vacuumizing the combined gaps, sealing and finally hot rolling. The hot rolling accumulation rolling reduction is controlled within 40% to 70%. Compared with the traditional super-thick plate production method, the invention has the advantages that the blank blocks are from the continuously cast blank so that the quality of the blank is better than a mould ingot and the production efficiency is better than that of the blank produced by electroslag remelting, the processing cost is low, and the production efficiency is high; and the invention has low requirements on the equipment and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of steel rolling in the metallurgical industry, in particular to a method for producing extra-thick plates by using a common continuous casting slab through a lap-roll-welding process. Background technique [0002] Due to the relatively large plane and thickness dimensions of wide and thick plates, the product has strong adaptability, and is more economical than other products in terms of large containers, military equipment, heavy machinery, offshore drilling platforms, nuclear power plants, and transportation. Reasonable. Therefore, in recent years, wide and thick steel plates are products to be encouraged in the steel industry development policy. [0003] According to the current steel rolling process, continuous casting slabs with greater thickness are required to produce thick plates, but the thickness of ordinary continuous casting slabs is generally 200-400mm (the production of continuous casting slabs with a ...

Claims

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Application Information

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IPC IPC(8): B23P17/00B23K20/04B23K20/14
Inventor 余伟张烨铭蔡庆伍何春雨刘涛郭锦
Owner UNIV OF SCI & TECH BEIJING
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