Inboard plate high strength steel and production method thereof

Abstract

The invention relates to a high strength steel and a production method thereof, and specially relates to an inboard plate high strength steel and a production method thereof. The invention aims to solve the technical problems that the cost of high strength steel is high because of the large using amount of alloy elements and the yield strength of cheap inboard plate cannot meet the requirements. The high strength steel is characterized by being composed of the following elements in percentage by weight: 0.04 to 0.06% of carbon, 0.005 to 0.03% of silicon, 0.15 to 0.25% of manganese, not more than 0.016% of phosphor, not more than 0.015% of sulfur, 0.002 to 0.003% of boron, 0.025 to 0.05% of aluminum, and the balance being Fe and inevitable impurity elements. The steel is used to manufacture inboard plates, the yield strength Rel is 600 to 720 MPa, the tensile strength Rm is 620 to 750 MPa, and the microstructure of the steel is a composite of fibrous ferrite, pearlite, and free cementite.

Description

technical field [0001] The invention relates to a high-strength steel and a production method thereof, in particular to a high-strength steel for ship inner plates and a production method thereof. Background technique [0002] Marine steel plates are high-quality steel materials. In order to meet the comprehensive performance requirements of marine steel plates for high strength and weldability, at present, various manufacturers add microalloys such as Nb, V, and Ti to the steel during the manufacturing process. Elements, and adding a certain amount of one or more of Cr, Ni, Cu, Mo and other elements to the steel will greatly increase the production cost of the steel and increase the operating burden of the enterprise. [0003] The search found that the patent application number is CN201010281752.1, and the Chinese patent application titled "Ultra-high-strength hull and offshore platform steel with a yield strength of 550Mpa and its production method" provides a super-high-s...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to: aim at the shortcomings of the prior art, provide a high-strength steel for ship inner plates with a yield strength within the range of 600-720 MPa, and provide its manufacturing method at the same time, mainly to solve the problems of existing high-strength steel for ship inner plates. The use of more alloying elements leads to high cost and technical problems such as the yield strength of high-strength steel for low-cost ship inner plates cannot meet the needs

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