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Rolling method for solving continuous cast billet shrinkagehole segregation

A billet and loose technology, applied in the direction of metal rolling, metal rolling, rolling mill control device, etc., can solve the problem of increasing the wire breakage rate of the wire rod, and achieve the reduction of wire breakage rate, carbon segregation, and drawing performance. improved effect

Active Publication Date: 2007-06-13
SHOUGANG CORPORATION
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Problems solved by technology

The user directly cold-draws from φ12.5mm to φ5.05mm without heat treatment during use, and the diameter reduction rate caused by drawing is as high as 85%. If it cannot be eliminated or alleviated in the process, it will greatly increase the broken wire rate of the wire rod in the drawing and twisting process

Method used

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Embodiment Construction

[0014] After several years of research and development, Shougang has successfully developed a process route for continuous casting billet to produce large-size 82B wire rod, which passed the appraisal organized by Beijing Municipal Science and Technology Commission in December 2004. Experts believe that this process solves the technical problem that the shrinkage and looseness of large-scale 82B wire rods cannot be welded well. This is an innovation with international influence. So far, Shougang has used this process to produce nearly 600,000 tons of large-scale 82B series wire rods. The 82B wire rods produced by Shougang are widely used on Qinghai-Tibet Railway, Beijing Fifth Ring Road pavement and cable-stayed bridges.

[0015] The production process of Shougang to produce 82B wire rod for 1860Mpa steel strand is as follows:

[0016] Hot metal desulfurization—80t converter smelting—LF furnace refining—130×130mm 2 Billet continuous casting - heating - rolling into φ12.5mm wi...

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Abstract

The invention relates to rolling method used to solve continuous casting small square billet porous shrinkage cavity. It includes the following steps: heating, high pressure water de-scaling, rolling and cold controlling. Its features are that in heating, hot section temperature is increased to 1250+ / -20 degree centigrade and remained for 65+ / -5 minutes; before rolling, the pressure in high pressure water de-scaling is controlled at 70-150MPa; rolling temperature is controlled at 1020-1060 degree centigrade. This method can make the porous shrinkage cavity of the small square billet center seam.

Description

[0001] Field [0002] The invention belongs to the field of steel rolling and is mainly applicable to the rolling technology of continuous casting billets. Background technique [0003] In the history of steel manufacturing, before adopting the continuous casting technology, the molten steel is usually poured into the steel ingot mold to cast the steel ingot, and then processed into the required billet size by rolling. In this process, the billet has to be heated and processed several times, which not only consumes a lot of energy, but also has a low yield. Therefore, from the beginning of the last century, people began to develop continuous casting technology one after another. In the 1970s, it began to be used in large-scale actual production, and gradually formed today's modern continuous casting technology. The use of continuous casting instead of die casting technology saves the blanking of the initial rolling, saves the heat of the soaking furnace, reduces the consumpti...

Claims

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Application Information

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IPC IPC(8): C21D8/00B21B1/46B21B37/00
Inventor 周德王全礼李永东陈明跃车金萍芦斌易敏张玮李飞刘玉新孙祥元章军
Owner SHOUGANG CORPORATION
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