Treatment method for improving tensile property qualification rate of steel plate

Abstract

The invention provides a treatment method for improving the tensile property qualification rate of a steel plate, and belongs to the technical field of steel and iron. The treatment method comprises the following steps that for a first stage, the steel plate is placed on a cooling bed and cooled to 300-550 DEG C; for a second stage, natural aging is carried out on the steel plate for 24 h or abovein a lower line stacking slow cooling manner, the steel plate is slit to obtain a plurality of sub-steel plates when the surface temperature of the steel plate is less than or equal to 150 DEG C, andsampling and initial inspection sample machining are carried out; and for a third stage, natural aging is carried out on an initial inspection sample and the plurality of sub-steel plates corresponding to the initial inspection sample for 24-72 h, and the tensile property of the initial inspection sample subjected to natural aging is detected. Compared with the mode of directly detecting the tensile property of the initial detection sample in the second stage, the method has the advantage that the qualification rate of the tensile property of the steel plate can be improved through the treatment in the third stage.

Description

technical field [0001] The present application relates to the technical field of iron and steel, and in particular, relates to a treatment method for improving the pass rate of tensile properties of steel plates. Background technique [0002] Plate is one of the most important products in the steel industry and plays a very important role in the development of the national economy. At present, customers have relatively strict requirements on the delivery time of medium and heavy plate products, especially the relatively long production cycle of thick gauge steel plates. It is very important whether the performance of the initial inspection and the final inspection are qualified. Once the performance of the initial inspection is unqualified, the probability of passing the re-inspection If the re-inspection performance is still unqualified, it will lead to a long re-rolling cycle, which will seriously affect the product delivery time and is not conducive to market competition....

AI Technical Summary

Problems solved by technology

At present, customers have relatively strict requirements on the delivery time of medium and heavy plate products, especially the relatively long production cycle of thick gauge steel plates. It is very important whether the performance of the initial inspection and the final inspection are qualified. Once the performance of the initial inspection is unqualified, the probability of passing the re-inspection Small, if the re-inspection performance is still unqualified, it will lead to a long rerolling cycle, which will seriously affect the product delivery time and is not conducive to market competition

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