High-ductility EH36-grade ocean engineering steel and manufacturing method thereof

Abstract

The invention relates to EH36-grade ocean engineering steel with high ductility, which is characterized by comprising the following chemical components in percentage by weight: 0.05%-0.08% of C, 0.10%-0.30% of Si, 1.00%-1.50% of Mn, 0.01%-0.04% of Nb, 0.02%-0.05% of V, 0.005%-0.02% of Ti, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.01%-0.05% of Als and the balance of Fe and inevitable impurities. The chemical components of the steel are not added with precious alloy elements such as Ni; the microscopic structure and the grain size of the steel plate are regulated and controlled by controlling the content of sulfur and phosphorus and adopting continuous casting billet induction heating, two-stage controlled rolling, relaxation and controlled cooling processes, and the steel plate which is high in yield and stable in strength and toughness and particularly has high ductility is obtained.

Description

technical field [0001] The invention relates to the field of iron and steel material preparation, Background technique [0002] In recent years, although marine accidents involving marine engineering equipment have been decreasing, serious marine accidents often occur, often resulting in huge property losses and loss of life. Therefore, it is important not only to provide measures to prevent collision and grounding of marine engineering equipment, but also to discuss how to minimize losses in the event of a shipwreck. With the decreasing offshore resources of various countries and the implementation of the United Nations Convention on the Law of the Sea Development has become an inevitable trend, and the near-ocean industry is gradually transforming into the marine industry, completing the upgrade from the offshore to the ocean. Once a marine accident involving marine engineering equipment occurs, it will cause huge property damage and loss of life. Therefore, it is import...

AI Technical Summary

Problems solved by technology

The patent is designed with low-carbon and micro-alloy strengthened components, and adopts two-stage rolling plus water-cooling-air-cooling-water-cooling three-stage cooling. The production process of this technology is complex, requiring high equipment control capabilities, long production cycle, and narrow process window.

[0007] The invention patent with the publication number CN110714171A discloses a high ductility EH420 grade ship plate steel and its production method. The ultra-fast cooling technology with a speed of 60°C / s can obtain a composite structure of soft phase ferrite plus hard bainite, but this technology is difficult, and it is difficult to achieve the required cooling rate conditions in actual industrial production, and the steel plate thickness Conditions are limited

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