High-temperature-resistant microalloy high-carbon steel 82B wire rod and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant microalloy high-carbon steel 82B wire rod. Raw materials comprise carbon, silicon, chromium, manganese, titanium, niobium, nickel, phosphorus, vanadium, sulfur, copper, nitrogen and iron. The content of the carbon is matched with the content of the chromium, so that the strength of the wire rod is improved, and mechanical properties are met. The vanadium and the nitrogen are used cooperatively, so that the strength of the wire rod is further improved, and the plasticity and the fatigue performance are improved. The carbon, the chromium, the vanadium and the nitrogen are matched with the other components, and specially designed technological parameters are adopted in the processes of smelting with a converter, secondary refining, square billet continuous casting and square billet rolling, so that the average carbon segregation is smaller than 1.03, internal cracks reach the level 0 to the level 2, and the sorbite content is not smaller than the index of 93%; A-class, B-class, C-class, D-class and DS-class non-metallic inclusions are all smaller than 1.5, the tensile strength is 1150-1250 MPa, and the section shrinkage rate is larger than 30%; especially a steel strand made of the wire rod has the characteristics of being low in slack property, and high in yield ratio and ductility.

Description

technical field [0001] The invention belongs to the technical field of micro-alloy high-carbon steel wire rod manufacturing, in particular to a high-temperature-resistant micro-alloy high-carbon steel 82B wire rod and a preparation method thereof. Background technique [0002] High-strength prestressed steel strand is a kind of economical and efficient steel, which has the characteristics of high tensile strength and yield strength, good plasticity, and low relaxation performance. It is widely used in large-scale high-speed railways, highways, bridges, roof trusses and high-rise buildings. In the project, it uses high-carbon steel wire as raw material, which is cold-drawn into steel wire after surface treatment, and then twists a certain number of steel wires into strands according to the steel strand structure, and then undergoes a stabilization process to eliminate stress. The above-mentioned high-carbon steel wire rods are mainly 82B wire rods. The wire rods of this speci...

AI Technical Summary

Problems solved by technology

The above-mentioned high-carbon steel wire rods are mainly 82B wire rods. The wire rods of this specification have the advantages of high strength, high toughness, low relaxation, and corrosion resistance. The manufacturing process includes blast furnace ironmaking, molten iron pretreatment, converter smelting, secondary refining, and die casting , rolling, cooling and finished product inspection, each step cooperates with each other to produce a good quality finished product. Among them, steelmaking is mainly to control the chemical composition, size and shape of inclusions, composition segregation, etc. Steel rolling must control the finished product size, surface quality and finished product Performance, such as C and Cr, the former is to ensure the strength requirements of the finished product, and the latter is to meet the mechanical properties of the finished product. The method of billet continuous casting in die casting is helpful for the control of carbon segregation, and other processes also need to be carefully selected. Equipment and design parameters, so each manufacturer has carefully arranged in their respective manufacturing processes, but there is still room for improvement in the existing processes

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