High speed production method for controlling banded structure of low carbon steel wire rod

Abstract

The invention discloses a high speed production method for controlling a banded structure of a low carbon steel wire rod, and belongs to the technical field of steel rolling. The method comprises the following steps: keeping the temperature of 1,080-1,120DEG C of a soaking zone of a heating furnace for 30 to 40 minutes to ensure the homogenous dispersion of alloying elements; performing 6-pass roughing, 6-pass medium rolling, 6-pass pre-finish rolling and 10-pass no twist finish rolling, and reasonably setting the rolling temperature and deformation of each deformation stage; starting and strengthening water cooling guide positions in the finish rolling process, and keeping the finish rolling temperature rise at 100-120DEG C; quickly cooling by using five water cooling tanks, ensuring that the first three water cooling tanks reduce temperature of 100-150DEG C, and keeping the spinning temperature at 850-900DEG C; and after spinning of the wire rod, reasonably setting a roller bed transmission speed and the thickness of the wire rod on a Stelmor air cooling line, and keeping the air cooling speed at 1-3DEG C/s and the phase-transition temperature at 700-780DEG C. The high speed production method has the advantages that the level of the banded structure of the low carbon steel wire rod is effectively controlled to be below level 2, the texture uniformity and cold heading property of the material are greatly improved, and the process applicability is high.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and proposes a high-wire production method for controlling the banded structure of low-carbon steel wire rods, which effectively reduces the banded structure, improves the drawing and cold heading performance of the wire rod, and has strong process practicability , suitable for the improvement of the quality of low-carbon cold heading steel wire rod in high-speed wire rod factories. Background technique [0002] Low carbon cold heading steel wire rod is the most widely used raw material for metal products and standard parts. Its deep processing process includes: mechanical descaling - pickling descaling - wire drawing - annealing - cold heading forming - quenching and tempering treatment, of which drawing Wire breaking and cold heading cracking are the most concerned issues in the deep processing industry, especially cold heading cracking has the greatest impact on production, so improving ...

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Problems solved by technology

[0004] For reducing the band structure of alloy steel, Liu Yunxu and others conducted a series of studies on medium and thick plates, and achieved certain results. Many tests have also been carried out on the bar. By reducing the finish rolling temperature and increasing the hot rolling deformation, the gear steel strip is controlled below 2.5. At the same time, through the controlled rolling and cooling of the whole process of the bar production line, the successful development For large coils of cold heading steel, CNR Group has successfully controlled the band structure level through heat treatment of materials, but there are few reports on the band structure research of low carbon steel cold heading steel high-speed wire rods, mainly because , the research on the plastic cracking of cold heading steel and the effect of band structure on deep drawing and cold heading cracking is not deep enough. The goal of microstructure uniformity is achieved by refining the grains, and the cold deformation ability is improved. However, with the increase in the complexity of the standard parts processing technology and the increase in the amount of cold deformation, the effect of grain refinement is not conducive to the cold heading steel wire rod. Deep processing, the current pursuit of low yield ratio of cold heading steel and non-quenched and tempered cold heading steel products is the best evidence

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