Production method of 650 MPa-grade ultrahigh-strength steel bars

Abstract

The invention discloses a production method of 650 MPa-grade ultrahigh-strength steel bars. The production method comprises the steps of smelting and rolling. According to the method, a production process combining vanadium-nitrogen microalloying and controlled rolling and controlled cooling technologies is adopted, a novel molten steel nitrogen increasing process is adopted for smelting, and it is guaranteed that sufficient nitrogen and vanadium microalloying elements are combined to generate sufficient dispersedly-distributed two-phase particles, so that a stronger precipitation strengthening effect is achieved; and a whole-process high-precision temperature controlled rolling and temperature controlled cooling new technology is adopted for rolling, adding of a large number of precious microalloy elements is effectively reduced, meanwhile, the low-temperature toughness and welding performance of the product are improved, energy-saving, environment-friendly and green production of the650 MPa-grade ultrahigh-strength steel bars is achieved, new breakthrough of industrial production is achieved on the basis of existing 600 MPa-grade high-strength steel bars, and great significancein promoting material-saving and energy-saving sustainable development of the construction industry is achieved.

Description

technical field [0001] The invention relates to the technical field of steel bar production, in particular to a production method of 650MPa-level ultra-high-strength steel bar. Background technique [0002] Housing construction and civil engineering are mainly based on reinforced concrete structures, of which hot-rolled ribbed steel bars are the main raw materials, and their quality directly affects the quality of engineering construction, which is related to public safety and personal and property safety. The construction industry is the largest steel consumption The industry is also the industry with the largest resource consumption; therefore, promoting the application of high-strength steel bars and ultra-high-strength steel bars to reduce the consumption of construction steel is the development direction of the metallurgical industry and the construction industry. With joint efforts, 400MPa, 500MPa, and 600MPa high-strength steel bars have been developed successively, w...

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Problems solved by technology

[0004] The application provides a production method of 650MPa grade ultra-high-strength steel bar, which solves the waste of steel when traditional low-strength steel is used. Traditional high-strength steel has high production costs, large consumption of iron ore, coke, and lime, and The problem of short converter life

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