Method for acquiring quantitative standard for central segregation of continuous casting blank

Abstract

The invention discloses a method for acquiring a quantitative standard for the central segregation of a continuous casting blank. The method comprises the following steps that: molten steel containinga target chemical component is prepared into a continuous casting blank; the continuous casting blank is processed into a rolled piece; a rolled piece sample is screened from the rolled piece, wherein the metallographic structure of the rolled piece sample meets a preset upper qualification limit; a to-be-measured element content of the rolled piece sample is measured; according to the to-be-measured element content as well as the target chemical component a to-be-measured element segregation value of the rolled piece sample is obtained; and a central segregation quantitative standard of thecontinuous casting blank is obtained, wherein the central segregation quantitative standard is equal to the segregation value of the to-be-measured element. According to the invention, a problem thatthe segregation value of the continuous casting blank can not correspond to the metallographic structure because the central segregation of the continuous casting blank can not track the specific steel wire rod position during the determination process of the quantitative standard for the central segregation of the continuous casting blank is solved; and thus the acquisition speed of the quantitative standard for the central segregation of the continuous casting blank is improved substantially.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a method for obtaining quantitative standards for central segregation of continuous casting slabs. Background technique [0002] Central segregation is a common defect in continuous casting slabs of iron and steel materials. Since it cannot be eliminated by subsequent rolling or annealing, the degree of central segregation in continuous casting slabs directly affects the quality of rolled products (such as wire rods). The central segregation of continuous casting slabs cannot be completely eliminated in actual production, and can only be alleviated by certain measures. It has become a subject of great practical significance to determine an effective quantitative standard for central segregation to control the quality of subsequent rolled pieces. [0003] The method of obtaining the quantitative standard of central segregation of continuous casting slab usually depen...

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Problems solved by technology

[0004] The central segregation of the continuous casting slab changes discontinuously along the length direction of the continuous casting, and the randomly obtained continuous casting slab analysis samples are not necessarily at the most serious position of the continuous casting slab; The level of abnormal metallographic structure was further verified, and the center segregation value of the corresponding continuous casting slab before rolling could not be obtained

The inhomogeneity of the central segregation of the continuous casting slab determines that the detection results of the central segregation of the continuous casting slab and the abnormal metallographic structure of the rolled piece are difficult to correspond one by one

This makes the judgment result of whether the quantitative standard of central segregation of continuous casting slab is reasonable or not sometimes distorted, and it is more difficult to obtain a reasonable quantitative standard of central segregation efficiently and quickly. Only after a large number of sampling analysis and long-term data accumulation can a more accurate Central Segregation Quantitative Standard

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