HRB500E anti-seismic rebar rolling method

Abstract

The invention discloses a HRB500E anti-seismic rebar rolling method. The method includes a heating process, a rolling process and a cooling process. In the heating process, the temperature of a raw material before being fed into a heating furnace is lower than 500 DEG C, a raw material heating temperature ranges from 1200 DEG C to 1250 DEG C, the time of the material in the furnace is 70-100 minutes, and the heating furnace adopts a reducing atmosphere. The cooling process adopts a natural cooling manner. By the HRB500E anti-seismic rebar rolling method, weakening of intercrystalline binding force and excessive thinning of crystalline grains can be effectively avoided, dislocation density is reduced, and increase of yield-tensile ratio and avoidance of surface cracks are realized. The HRB500E anti-seismic rebar rolling method has the advantages of technical simplicity, excellent mechanical property, high product yield and the like, product production cost can be effectively reduced, and product quality is improved.

Description

technical field [0001] The invention relates to a production method of anti-seismic steel bars, in particular to a rolling method of HRB500E anti-seismic steel bars. Background technique [0002] my country is an earthquake-prone country, and every strong earthquake brings catastrophic consequences, such as the Tangshan earthquake in 1976 and the Wenchuan earthquake on 5.12. This has also aroused great attention in the construction industry to the strength and seismic performance of steel bars. From the perspective of saving metal and building safety, the state has explicitly eliminated low-strength steel bars such as HRB335, and developed towards high-strength, seismic performance, which also provides motivation for the development and use of HRB500E high-strength seismic steel bars. The total amount of HRB500E steel bars used in China is still small, but it shows a trend of increasing year by year and the development speed is accelerating. However, only a few enterprises c...

AI Technical Summary

Problems solved by technology

[0003] 1. The pass rate of the preliminary inspection of mechanical properties is low. The main problem is that the yield ratio Rm / Rel is less than 1.25, which cannot meet the requirement that the yield ratio Rm / Rel specified in GB1499.2-2007 should not be less than 1.25. Change the sentence to HRB500 steel bars without strength-to-yield ratio requirements

[0004] 2. After rolling, the product presents surface cracks consistent with the rolling direction, which does not meet the bending performance specified in GB1499.2-2007, resulting in a large number of waste products

[0005] The above problems not only increase the operating cost, but also bring certain hidden dangers to the product quality

Images