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<p>This study examined the impact of homogenizing annealing on the degree of carbide inhomogeneity in hot-rolled bars made from 1.5Cr bearing steel. Qualitative microstructure assessments were conducted and analyzed. It was determined that the required quality of the final product is achieved by homogenizing the continuously cast billets through annealing. During this process, diffusion mechanisms promote a&#xa0;uniform chemical composition throughout the billets and resulting hot-rolled bars. Homogenizing annealing was performed at 1200 °C for six hours, followed by slow cooling under a&#xa0;thermal insulating cover, hot rolling, and a&#xa0;two-stage controlled cooling process using an improved regimen on the 370/150 wire rod mill and the Stelmor cooling line. As a&#xa0;result, the microstructure of 1.5Cr bearing steel exhibited a&#xa0;significant reduction in carbide inhomogeneity. This reduction was evaluated according to the GOST 801 and SEP 1520 standards. Homogenizing annealing of the continuously cast billet, followed by hot rolling, resulted in a&#xa0;more uniform microstructure with reduced carbide liquation, as well as decreased chemical and structural heterogeneity. These improvements were observed across the entire size range, with wire rod diameters from 5.5 to 18.5 mm.</p>

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Effects of homogenizing annealing of continuously cast billet on carbide segregation level in hot-rolled bars of bearing steel

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • S. A. Savchenko,
  • I. A. Kovaleva,
  • I. V. Astapenko,
  • A. B. Sychkov

摘要

This study examined the impact of homogenizing annealing on the degree of carbide inhomogeneity in hot-rolled bars made from 1.5Cr bearing steel. Qualitative microstructure assessments were conducted and analyzed. It was determined that the required quality of the final product is achieved by homogenizing the continuously cast billets through annealing. During this process, diffusion mechanisms promote a uniform chemical composition throughout the billets and resulting hot-rolled bars. Homogenizing annealing was performed at 1200 °C for six hours, followed by slow cooling under a thermal insulating cover, hot rolling, and a two-stage controlled cooling process using an improved regimen on the 370/150 wire rod mill and the Stelmor cooling line. As a result, the microstructure of 1.5Cr bearing steel exhibited a significant reduction in carbide inhomogeneity. This reduction was evaluated according to the GOST 801 and SEP 1520 standards. Homogenizing annealing of the continuously cast billet, followed by hot rolling, resulted in a more uniform microstructure with reduced carbide liquation, as well as decreased chemical and structural heterogeneity. These improvements were observed across the entire size range, with wire rod diameters from 5.5 to 18.5 mm.