High-strength strip steel straightening, flattening and straightening process

Abstract

The invention discloses a high-strength strip steel straightening, flattening and straightening process. The high-strength strip steel straightening, flattening and straightening process is characterized in that a hot rolling high-strength steel plate or strip steel sequentially passes through an inlet straightening machine, a temper mill and an outlet straightening machine, and by means of the combined working procedures of straightening, flattening and straightening, the adjustment of the plate shape, the surface quality, the mechanical performance and the residual stress of the strip steelis completed; the inlet straightening machine is used for conducting rough straightening on the strip steel, on the one hand, the plate shape of the supplied material is improved, and on the other hand, the scale on the surface of the strip steel is reduced; the temper mill is used for conducting flattening on the strip steel, the plate shape of the strip steel is improved, the mechanical performance of the strip steel is adjusted, and the surface quality of the strip steel is improved; and the outlet straightening machine is used for conducting precise straightening on the strip steel, the unquenched plate shape problems and newly-generated plate shape problems in the flattening process are solved, and the unquenched residual stress and newly-generated residual stress in the flattening process are eliminated.

Description

technical field [0001] The invention relates to a high-strength steel strip leveling process, which is suitable for the field of hot-rolled and cold-rolled high-strength steel strip finishing. technical background [0002] The demand for high-strength steel in the market is increasing day by day, and the proportion of high-strength steel in the strip steel produced by various steel mills is getting higher and higher (mainly refers to the strip steel with yield strength above 400Mpa), and the proportion of high-strength steel in some new production lines has exceeded 50% . The shape of hot-rolled high-strength steel plate is poor, and generally cannot be delivered directly. It needs further processing to improve the shape and surface quality before it can be delivered to customers. At present, all factories at home and abroad use the tempering process to improve the shape of hot-rolled high-strength steel. There are some problems in the production of high-strength steel by ...

AI Technical Summary

Problems solved by technology

There are some problems in the production of high-strength steel by using the traditional leveling process: 1. Because the strength is too high, the leveling ability is not enough, and one leveling cannot meet the product quality requirements. Usually, multiple passes are required, which seriously affects the production capacity of the unit; 2. After leveling, there are relatively large Large residual stress causes strip steel to deform after cutting; 3. The consumption of rolls is large, and the consumption of rolls for producing high-strength steel is more than twice that of soft steel; Larger, the use of flat rolls cannot meet the rolling requirements. During production, different roll shapes must be matched according to different strips and rolling forces; The above cannot meet all customer requirements; among them, I-units is the standard unit for describing the shape of the plate, and its definition is as follows:

6. There are problems such as loose coils, uneven coils, loose coils, and tower shapes in the coiling of thick strips.

[0004] In the face of the increasing demand for high-strength steel and the quality requirements of high-strength steel products, the traditional high-strength steel smoothing process can no longer meet the needs of the market, and high-strength steel finishing has always been a problem in the steel rolling industry.

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