High-strength steel and production process thereof

CN118880194BActive Publication Date: 2026-06-30HUNAN VALIN LIANYUAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN VALIN LIANYUAN IRON & STEEL CO LTD
Filing Date
2024-07-19
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

High-strength steel with a strength of 960MPa or higher is prone to cracking and fatigue cracking during processing, mainly due to unscientific composition design and poor internal quality of continuously cast billets.

Method used

By employing rare earth processing technology and electromagnetic stirring technology, and through processes such as KR desulfurization, LF refining, and RH refining, the size of inclusions is controlled and the quality of continuously cast billets is improved. Specifically, rare earth alloys are added to refine inclusions, and roller electromagnetic stirring and dynamic light reduction technology are used during continuous casting.

Benefits of technology

It significantly improves the impact toughness and overall quality of high-strength steel, with inclusions controlled below grade 1.0, ensuring the high strength and toughness of high-strength steel to meet the requirements of large-scale engineering machinery.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a high-strength steel and its production process, relating to the field of high-strength steel production technology. The high-strength steel comprises the following chemical composition by mass percentage: C: 0.17-0.19%, Si: 0.40-0.50%, Mn: 1.60-1.90%, P≤0.010%, S≤0.0010%, Ni: 0.10-0.30%, Mo: 0.25-0.40%, Nb: 0.05-0.06%, V: 0.045-0.055%, Ti: 0.020-0.030%, Cr: 0.30-0.60%, B: 0.003-0.004%, Alt: 0.020-0.050%, RE: 0.002-0.005%, N: 0.0030-0.0040%. The high-strength steel of this invention has good toughness and high strength.
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