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Progress in the R&D of core roll materials for rolling mills has led to significant improvements in wear resistance and service life.
Release time:
2025-10-14
In recent years, significant progress has been made in the research and development of core roll materials for rolling mills. Through optimized compositions and innovative processes, both wear resistance and service life have been greatly improved.
In recent years, significant progress has been made in the research and development of core roll materials for rolling mills. Through optimized compositions and innovative processing techniques, both wear resistance and service life have been greatly improved. Take 9Cr2MoV roll steel as an example: its carbon content is controlled within the range of 0.85% to 0.95%, and when combined with alloying elements such as chromium, molybdenum, and vanadium, it forms a composite microstructure consisting of a martensitic matrix and retained austenite. This material achieves a hardness of 58-65 HRC and a tensile strength exceeding 1200 MPa. In cold rolling applications, this material delays wear via a "self-hardening" mechanism. One enterprise reported that after adopting this material, the surface roughness of the rolled strip decreased by 30%, and the service life of each roll increased to 256.1 tons per roll—a substantial improvement over conventional materials.
In the area of high-speed steel rolls, the RC series developed by Zhonggang Xingji achieves a balance between core strength and surface wear resistance through a subcritical heat treatment process, eliminating the need for high-temperature quenching. Specifically, the RC200 series is designed for special sheet materials such as silicon steel and stainless steel, offering a 100% increase in roll service life, a 50% reduction in single-pass wear, and superior roll shape retention compared to imported products.
Surface engineering technology has achieved further breakthroughs. Laser cladding with a WC-Co alloy layer has enabled the roller surface to attain a hardness of over 70 HRC, increasing wear resistance by a factor of three. After implementation in a certain aluminum foil rolling mill, the regrinding cycle has been extended from once a week to once a month, resulting in annual cost savings exceeding 2 million yuan. Moreover, electroslag remelting technology has refined carbide particle size down to 2–5 μm, boosting resistance to spalling by 35%. When used on Senge-Miller rolling mills, the reduction in roll thickness has been significantly reduced, and the frequency of roll changes has declined. These advancements provide crucial technical support for the efficient and stable operation of rolling mill roll materials.
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