Judgment method of crystal grain mixed crystal defect type in cable steel wire rod

Abstract

The invention discloses a method for judging the grain-mixed-crystal defect type of cable steel wire rod, which belongs to the technical field of steel rolling. It includes sampling and analyzing the defective parts of cable steel wire rods to obtain the mixed crystal defect types with the following characteristics; 1) The edge of the cable steel wire rod after corrosion is relatively large grains, the grain grade is 0-3, and the average grain diameter is More than 1 mm; II) the middle columnar crystals after corrosion of the cable steel wire rod, the grain size of the columnar crystals is 1 to 4, and the average diameter of the grains is between 1 mm and 0.5 mm; III) the cable steel wire rod After corrosion, there is a circle of large grains on the periphery. The grain size of the large grains is 3 to 5, and it is in the shape of equiaxed crystals. The average diameter of the grains is between 0.1 mm and 0.5 mm. This judgment method quickly determines the link of the generation of mixed crystal defects in the grain of the cable steel wire rod through the detected type of mixed crystal defects, so as to take targeted quality improvement and control measures from the source heating process and rolling process to reduce unqualified products, reducing the number of demotions or revisions.

Description

Technical field [0001] The present invention relates to a cable steel strip crystal grain mixed crystalline, which is a method of determining a type of cable steel strip grain crystalline defect type. Background technique [0002] With the great development of national communications and communications, the demand for cable steel strips is increasingly wide. It is an important part of the national communications information highway system. The quality of cable steel strips is related to the quality of communication, so the quality requirements of cable steel strips are more strict. As one of several steel companies that can produce cable steel strips in China. It has always been, and it is also very highly attached to the quality of cable steel strips in the first place in China, and strictly follow the national standards and personalized agreements reached with users. Production, quality inspection and Inspection work. At the same time, the new equipment, new method, and new tec...

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Problems solved by technology

[0004] The current national standard GB / T6394-2017 "Measurement Method for Average Metal Grain Size" does not introduce the mixed crystal inspection in detail. Similarly, this standard cannot be used to evaluate cable steel wire rods, otherwise it is easy to mislead the formulation of core parameters related to the hot rolling process of cable steel wire rods

At the same time, it is impossible to accurately determine the performance of mixed crystals: grain mixed crystal morphology, grain mixed crystal size, grain mixed crystal shape, and grain mixed crystal distribution

[0005] With the development of hot-rolling high-line equipment technology, the optimization and improvement of heating process and rolling process parameters, the improvement of quality management system and information management means, the control means of the degree of mixed crystal grain size of cable steel wire rod are becoming more and more It has been perfected, and the inspection of grain mixed crystals is becoming more and more important, but there is a lack of corresponding inspection methods and evaluation methods. Most of the quality problems of cable steel wire rod grain mixed crystals have brought great impact on production, quality inspection and judgment. more difficult

[0006] Therefore, the existing quality control technology for cable steel wire rod is not perfect, and it is necessary to increase the inspection of grain mixed crystal level as a monitoring item index to improve the quality of hot-rolled cable steel wire rod

[0007] Moreover, the existing GB / T6394-2017 "Method for Measuring the Average Grain Size of Metals" grain size evaluation method cannot accurately describe the characteristic morphology of microscopic mixed crystal defect types, and cannot provide targeted guidance for continuous quality improvement in the later stage. measure

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