A high-strength finish-rolled rebar and its production process

Abstract

This application proposes a high-strength finish-rolled rebar and its production process, wherein the high-strength finish-rolled rebar comprises the following components by weight percentage: C: 0.25-0.35%, Si: 0.30-0.60%, Mn: 0.80-1.60%, P≤0.035%, S≤0.035%, and the balance is Fe. This application adjusts the chemical composition of the finished-rolled rebar and further adjusts the production process, so that the quality and performance indicators of the finished-rolled rebar are stable and qualified, and the production cost is more than 200 yuan / t lower than the original technical route, and the economic benefits are remarkable.

Description

technical field [0001] The application belongs to the technical field of production of finish-rolled rebar in the metallurgical industry, and specifically relates to a high-strength finish-rolled rebar and a production process thereof. Background technique [0002] At present, the main component system used in the production process of high-strength finish-rolled rebar is 45Si2MnV. Due to the wide-scale use of steel bars and the high requirements of enterprises on production costs, the current composition system and production process are no longer applicable. The main problems are: [0003] (1) Problems in the steelmaking process [0004] ①The content of C element is high, and the requirements for P, S, and O are high. It is necessary to use high-quality steel routes, use refining furnaces, and use high-cost smelting processes such as stopper packs, electromagnetic stirring, and full-process protection pouring. The requirements for the production conditions of the workshop...

AI Technical Summary

Problems solved by technology

[0004] ①The content of C element is high, and the requirements for P, S, and O are high. It is necessary to use high-quality steel routes, use refining furnaces, and use high-cost smelting processes such as stopper packs, electromagnetic stirring, and full-process protection pouring. The requirements for the production conditions of the workshop Strict, which leads to poor flexibility in production scheduling. It is very difficult to schedule the production of fine-rolled thread varieties each time, and it needs to be considered in many aspects to achieve production scheduling.

[0005] ②In order to ensure the quality of casting slabs, the steelmaking adopts the process of reducing the casting speed of the continuous casting machine, and the production capacity is about 50% lower than that of the refined-rolled rebar or anchor rods for construction. The average daily output of the refined-rolled rebar and anchor rods for construction is About 3,000 tons, while the daily output of high-strength finish-rolled threads is only 1,500 tons, which leads to a decrease in overall benefits

[0006] ③Steelmaking processing costs are higher

[0008] ①Due to the high alloy content and the high hardness of the steel itself, the impact on the K1 finished roll is relatively large, resulting in serious bursting. The roll material has been optimized many times, but it has not been completely solved. The single-groove rolling volume is only 100 tons about

Due to the lack of power after the tail steel is separated from the finished product, there are great difficulties in the upper cooling bed, which seriously restricts production

[0010] ③Steel with high alloy content, in order to ensure the surface quality of the steel, hot delivery cannot be realized

Due to the composition of the finished rolled rebar and defects in the preparation process, the smelting cost is high, and the quality and performance indicators of the finished rebar are unstable.

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