A thick plate rolling line and its production method

Abstract

A thick plate rolling line and its production method, the thick plate rolling line includes a descaling box, a large side pressure device, a rough rolling mill, an intermediate water cooling device, a finishing mill, a thickness gauge, a post-rolling Cooling device and heat straightening machine. The thick plate rolling line of the present invention can increase the maximum rolling length to 100m, and break through the limitation that the maximum billet length cannot exceed the effective roll body length, and can produce longer billets, and the rolling unit weight is significantly improved; the rolling rhythm of the steel plate, The width accuracy of the steel plate has been significantly improved.

Description

technical field [0001] The invention belongs to the technical field of thick plate rolling, in particular to a thick plate rolling line and a production method thereof. Background technique [0002] The general thick plate rolling process includes: descaling, rough rolling (vertical roll before or after the machine), waiting for temperature, finish rolling, pre-levelling, cooling after rolling, and hot straightening. The layout of the thick plate rolling process basically covers all kinds of equipment required in the above process. The main equipment includes descaling box, rough rolling mill, vertical roll, intermediate water cooling device, finishing mill, pre-leveler, post-rolling cooling device And heat straightening machine etc. The rolling line is arranged around the maximum rolling length of about 50m. [0003] The thick plate rolling process is generally divided into three stage types, namely forming, widening and elongation rolling, such as figure 1 shown. The s...

AI Technical Summary

Problems solved by technology

This process layout limits the maximum rolling length of the steel plate

[0006] (2) The existing thick plate rolling method uses three-stage rolling, which must be rolled back and forth using conical steel loading rollers for 90° rolling

The number of passes is large and the efficiency is low

[0008] ② If there is a relatively large buckle head in the last pass of the previous rolling stage, the contact area between the steel plate and the steel-turning roller table is small, resulting in difficulty in steel-turning, long time for steel-turning, and low rolling efficiency

In this way, the steel plate enters the water late, and the steel plate must be air-cooled for a period of time before entering the water. In general, the maximum speed of the cooling system after rolling (≤2.5m / s) is much lower than the maximum rolling speed of the rolling mill. Cooling after rolling The process forms a bottleneck; and the long air cooling time before the tail of the steel plate enters the water causes the temperature of the tail to enter the water to be low, and even the phase transformation has occurred before entering the water, which cannot achieve the purpose of the post-rolling cooling process, and the deviation of the crystal phase and mechanical properties in the length direction of the steel plate is too large

Images