Control method for peeling defects on surface of low-alloy hot-rolled steel plate

Abstract

The invention discloses a control method, and particularly discloses a control method for peeling defects on the surface of a low-alloy hot-rolled steel plate and belongs to the technical field of steel rolling production process methods. The invention provides the control method for the peeling defects on the surface of the low-alloy hot-rolled steel plate, which is simple to operate and relatively low in construction cost. In the control method, by taking a continuous casting slab as a basis, in a high-temperature heating procedure before rolling, vibration traces produced in the productionprocess of the continuous casting blank is burnt by increasing the heating temperature and prolonging the heating time so as to reduce, lower and weaken the vibration traces which cause the peeling defects and cannot be eliminated in hot rolling.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for surface peeling defects of low-alloy hot-rolled steel plates, and belongs to the technical field of steel rolling production processes. Background technique [0002] Low-alloy steel hot-rolled sheet is rolled from continuous casting slab after high-temperature receipt. Due to the decision of the continuous casting slab production process, continuous vibration marks are formed on the surface of the slab, and the troughs of the vibration marks are easy to form inclusions and aggregates or produce small surface cracks. These defects will form surface peeling defects in the subsequent hot rolling process. Low-alloy steel is highly sensitive to cracks, and the characteristics of the steel determine that its vibration marks are relatively deep, so peeling defects are more prominent, and hot-rolled sheets with peeling defects can only be degraded. At present, various manufacture...

AI Technical Summary

Problems solved by technology

Due to the decision of the continuous casting slab production process, continuous vibration marks are formed on the surface of the slab, and the troughs of the vibration marks are easy to form inclusions and aggregates or produce small surface cracks. These defects will form surface peeling defects in the subsequent hot rolling process. Low-alloy steel is highly sensitive to cracks, and the characteristics of the steel determine that its vibration marks are relatively deep, so peeling defects are more prominent, and hot-rolled sheets with peeling defects can only be degraded.

At present, various manufacturers generally use measures such as improving the quality of continuous casting machine equipment, optimizing the continuous casting process, etc., and controlling by improving the quality of slabs, which not only increases the cost, but also the control effect is unstable.