Heat treatment process of electric steel

Abstract

The invention provides a heat treatment process for electric power steel, which includes the following steps: (1) raising the temperature of the annealing furnace, and after the temperature of the annealing zone of the annealing furnace rises to 690-730°C, injecting DX gas into the annealing furnace; ( 2) Put the power steel to be processed on the conveyor belt of the annealing furnace for heat treatment; (3) Pass saturated steam into the bluening zone of the annealing furnace to blueize the iron core that enters the bluening zone after heating treatment; ( 4) After the iron core is blued, it is quenched and cooled. During the quenching and cooling process, an appropriate amount of methanol or kerosene should always be dripped into the furnace to prevent oxidative decarburization; (5) After quenching, low-temperature tempering deal with. The steel material after the heat treatment of the invention has high strength, high yield strength, low crack sensitivity, good corrosion resistance, good toughness, and can recover naturally after bending under force.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment process for electric steel. Background technique [0002] Since the power steel used in the transmission line tower structure in the past is mostly made of high-quality carbon structural steel, which is directly assembled with the iron tower, its tensile strength value, yield strength value, impact toughness, etc. can only rely on the properties of the steel itself. Regardless of the country, so far, the load on the tower has relied on the strength, stiffness and yield strength of the steel itself. The performance of the steel itself determines the strength, high plasticity and toughness, low crack sensitivity, corrosion resistance, etc. of the steel. [0003] With the rapid development of the electric power industry, large-capacity and high-voltage transmission lines have developed rapidly, and there have been multi-circuit 110KV, 220KV, 330KV, 500KV lin...

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of the electric power industry, large-capacity and high-voltage transmission lines have developed rapidly, and there have been multi-circuit 110KV, 220KV, 330KV, 500KV lines on the same tower and 750KV and 1000KV transmission lines with higher and higher voltage levels. Therefore, the tower design The load is getting bigger and bigger. In order to meet the load, the tower is getting bigger and bigger, and the tower is getting higher and higher. The strength and specifications of the traditional hot-rolled angle steel are not suitable for the development of large-capacity and high-voltage transmission lines. , can not meet the use requirements of large load tower