Method for improving performance uniformity of finished product through heat preservation and slow cooling after rolling

Abstract

The invention discloses a method for improving the performance uniformity of a finished product through heat preservation and slow cooling after rolling, which is used for a hot-rolled coil heat preservation cover device. The method comprises the following steps of: loading a produced steel coil onto the hot-rolled coil heat preservation cover device, and performing sealing treatment; starting aninternal ventilation device, and discharging high-temperature gas in a semicircular heat preservation cover; starting a gas protection device, and filling the semicircular heat preservation cover withprotective gas; starting an electric heating device, forming a heat preservation atmosphere in the semicircular heat preservation cover by utilizing residual heat of the steel coil, then waiting forthe own heat of the steel coil to dissipate, slowly cooling, checking the change of gas temperature in the semicircular heat preservation cover detected by a thermocouple, and finishing the heat treatment operation of the steel coil when the gas temperature value meets the production standard requirement; and loading the treated steel coil from the hot-rolled coil heat preservation cover device. The method has the beneficial effects that the performance uniformity of the finished product is effectively improved, the operation process is simple, the input cost is extremely low, and the actual effect is relatively good.

Description

technical field [0001] The invention relates to the technical field of heat treatment of metal materials, in particular to a method for heat preservation and slow cooling after rolling to improve the performance uniformity of finished products. Background technique [0002] At present, when some types of hot-rolled coils are produced in batches, quality problems such as large fluctuations in product length and performance are exposed at the user end, and these problems seriously affect the use of users. Studies have found that these problems are closely related to the uneven cooling of hot coils. In order to improve the performance uniformity of hot-rolled coils and improve the quality of the plate shape, the current technical method is to cool the hot-rolled steel coils to room temperature before entering the heating furnace. For tempering treatment, the specific technical methods are as follows: After the steel coil is produced, enter the other side of the steel coil wareh...

AI Technical Summary

Problems solved by technology

Although the existing technical methods can effectively improve the performance uniformity of hot-rolled coils, they also have the following disadvantages: due to the need to enter the holding furnace for tempering treatment, a large amount of gas is needed to heat the steel plate, and the energy cost is high. Building a holding furnace The initial investment cost of such equipment is high, and the later equipment needs long-term maintenance, which requires high maintenance costs

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