Method for manufacturing extra-thick plate blank by accumulative roller welding process

A technology of extra-thick slab and accumulative rolling, applied in manufacturing tools, other manufacturing equipment/tools, etc., can solve the problems of production efficiency, thickness, yield limitation, etc., and achieve the effect of low processing cost

Inactive Publication Date: 2010-12-29
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method effectively solves the quality problems of extra-thick plates, and concentrates defects such as inclusions and segregation at the solidification end, but there are still problems of limited production efficiency, thickness, and yield
Chinese patent document CN1134329 (95110197.8) discloses a method for producing unidirectionally solidified steel ingots, using a similar principle to produce ingots with a thickness of 900-1200mm, which can meet the production requirements of 150-300mm extra-thick plates, but there are also the same as the aforementioned patent CN201157895 The problem

Method used

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  • Method for manufacturing extra-thick plate blank by accumulative roller welding process
  • Method for manufacturing extra-thick plate blank by accumulative roller welding process
  • Method for manufacturing extra-thick plate blank by accumulative roller welding process

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: Take Q235 plain carbon steel as an example.

[0023] Select two continuous casting slabs of the same size and material with a thickness of 300mm, and perform sandblasting on the surface of the surface to be laminated to remove iron scale; use compressed air to clean the surface; wipe the surface after sandblasting with acetone to remove grease, use alcohol Remove surface pollutants; use dry air at 50°C to 80°C to dry the surface; stack the superimposed surfaces of the processed two continuous casting slabs together, put them into a vacuum chamber, and place gaps around the superimposed surfaces of the continuous casting slabs Welded closed under vacuum. The welded continuous casting slab is heated to an austenite zone of 1150°C to 1250°C for heat preservation, forged or rolled, with a reduction rate of 30% at one time and a total reduction rate of 50%. A slab of 150mm thickness was obtained. The surface scanning photos of the manufactured steel plate to ...

Embodiment 2

[0024] Embodiment 2: Take Q235 plain carbon steel as an example.

[0025] Sandblast the surface of three continuous casting slabs of the same size and material with the same thickness of 300mm to remove iron scale; use compressed air to clean the surface; use acetone to wipe the surface after sandblasting to remove grease; use alcohol to remove the surface Pollutants; use dry air at 50°C to 80°C to dry the surface; stack three continuous casting slabs together, put them in a vacuum chamber, and weld and seal the gaps around the joint surface of the continuous casting slabs under vacuum. Heat the welded continuous casting slab to the austenite zone at 1150°C to 1250°C for heat preservation, forging and forming, the first reduction rate is 30%, and the total reduction rate is 50%, to obtain a 450mm thick billet, which is then rolled by a rolling mill 200mm thick slab. Microstructure photos and transverse fracture photos of the manufactured steel plates are as follows: figure ...

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Abstract

The invention relates to a method for manufacturing an extra-thick plate blank by an accumulative roller welding process, which comprises the following steps: taking continuous casting billets which have the same size and are made of the same material, carrying out surface treatment for superposed surfaces of the continuous casting billets, then superposing the superposed surfaces of the continuous casting billets together, and welding and sealing surrounding seams under vacuum; and heating the welded continuous casting billets to between 1,150 and 1,250 DEG C of an austenitic area, and forging or / and rolling the heated continuous casting billets, wherein the one-time pressing rate is 30 to 35 percent, and the total pressing rate is 50 to 70 percent. The method adopts the accumulative roller welding process to produce extra-thick plates, and the tissues of the superposed surfaces are the same as the tissues of a matrix. Because the continuous casting billets are applied to producing the blank, the yield of the blank is higher than that of an ingot casting, and the processing cost of the blank is lower than that of the blank produced by a directional solidification method.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a production method for manufacturing extra-thick slabs by using common continuous casting slabs through cumulative stack-rolling welding technology. Background technique [0002] With the development of various large-scale machinery, high-rise buildings, and large-tonnage ships, the requirements for the size and internal quality of steel products are getting higher and higher. Wider, longer, and thicker steel plates are gradually developed, and the demand for extra-thick plates will increase. bigger and bigger. However, there are many disadvantages in the current production of extra-thick slabs. First, due to the limitations of quality, investment, productivity, and production costs, there are still many difficulties in producing slabs with a thickness of more than 400 mm by continuous casting; some enterprises use large steel ingots to process thick slabs , its disad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/00
Inventor 许荣昌刘洪银蒋鲤平孙会朝周来军周俊陵
Owner LAIWU IRON & STEEL GRP
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