Energy-saving rolling method of low alloy steel based on critical temperature

Abstract

The invention discloses an energy-saving rolling method of low alloy steel based on critical temperature. The method comprises the following steps of: sequentially carrying out heating furnace preheating treatment, heating furnace heating treatment, heating furnace soaking treatment, descaling before rough rolling, rough rolling, finish rolling, laminar cooling and coiling procedure on the low alloy steel, so as to finish rolling of the entire low alloy plate slab. The alloy plate slab is rolled between the common rolling temperature and the critical rolling temperature by reducing the heating temperature of the heating furnace; and a hot rolled strip of the low alloy steel meeting the mechanical performance requirements of tissue is produced. In addition, by adopting the process control method in the rolling process, the heating temperature is effectively reduced when the rolling effect is ensured; the heating energy consumption is reduced; and the production cost of the hot rolled strip is also saved.

Description

Technical field [0001] The invention relates to the technical field of hot-rolled plate and strip production, in particular to a low-alloy steel energy-saving rolling method based on critical temperature. technical background [0002] In the hot rolling production process, billet heating energy consumption generally accounts for 70% to 80% of the process energy consumption, and the energy consumption for rolling only accounts for 20% to 30%. Therefore, the potential for reducing hot rolling energy consumption mainly comes from the billet Energy consumption of the heating furnace. In the existing hot-rolled strip production process, the raw material is heated before the billet is rolled to increase the plasticity of the steel, reduce the deformation resistance and improve the internal structure and properties of the metal to facilitate rolling processing. However, high temperature and incorrect heating system may cause defects such as strong oxidation, decarburization and overbur...

AI Technical Summary

Problems solved by technology

This rolling method still adopts the idea of ​​controlled rolling and air-cooling process to ensure the mechanical properties of Q345 steel plate, and does not adopt the idea of ​​critical temperature, and considers the heating temperature and energy saving of the entire rolling process.

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