Rolling method for solving continuous cast billet shrinkagehole segregation

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...

AI Technical Summary

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%.