Production method of HRB500E high-strength and anti-seismic rebar

Abstract

The invention provides a production method of an HRB500E high-strength and anti-seismic rebar. The production method comprises the step that a billet is manufactured. The billet is prepared from the components in percentage: 0.20%-0.25% of C, 0.40%-0.70% of Si, 1.30%-1.60% of Mn, less than or equal to 0.045% of P, less than or equal to 0.045% of S, 0.020%-0.050% of V, 0.0050%-0.0120% of N, and thebalance of Fe and inevitable impurities; the components are basically the same as component formulas used in the production of HRB400 and HRB400E, steel has multiple stages, namely, by adjusting rolling processes, the production of HRB500E and HRB400E can be realized with the same chemical composition formula. Therefore, according to the production method of the HRB500E high-strength and anti-seismic rebar, a unified production technique can be adopted in the preparation of raw materials and blank, the production efficiency is improved favourably, the frequencies of adjusting preparation parameters such as temperature and the proportion of the components are reduced, the stability of products is improved, and the production efficiency is improved favourably.

Description

technical field [0001] The invention relates to the technical field of metallurgical steelmaking and processing, in particular to a production method of HRB500E high-strength anti-seismic steel bars. Background technique [0002] The volume of concrete used in construction projects in my country is huge every year, and a large amount of steel is consumed. Except for a small amount of prestressed steel wire strands, most of them are steel bars used in concrete. There are three grades of hot-rolled ribbed steel bars in my country: HRB335, HRB400 and HRB500. H, R, and B represent hot rolled (Hot rolled), ribbed (Ribbled), and steel bars (bars), respectively, and 335, 400, and 500 represent steel bars, respectively. The minimum yield strength, the unit is MPa. The higher the grade of the steel bar, the better the quality, and the strength, toughness and elongation will be enhanced accordingly. The promotion of high-strength steel bars will undoubtedly help reduce the amount of ...

AI Technical Summary

Problems solved by technology

[0006] However, there are currently the following main problems: 1. The rolling start temperature needs to be above 1070°C, and the heating capacity of the conventional heating furnace is insufficient. In order to increase the furnace temperature, sufficient heating is required, which inevitably reduces the production speed. This effect alone will cause a reduction in production efficiency 20-30%, and it will also cause large power consumption and coal consumption indicators. For example, the blast furnace gas consumption per ton of steel will be 500m 3 left and right, increasing rolling costs

Due to the high content of V elements, the steel rolling furnace still needs to heat the billet to above 1050°C to realize the solid solution of V elements in the steel, so as to effectively exert the precipitation strengthening of V and N elements on the steel in the subsequent rolling and cooling process , Fine grain strengthening effect, therefore, the steel rolling process is forced to adopt a high temperature heating temperature system different from ordinary HRB400 and HRB400E, resulting in a reduction in the production efficiency of the steel rolling heating furnace and an increase in energy consumption