Heat treatment process of electric steel

A heat treatment and steel technology, applied in the field of heat treatment, can solve the problems of not being suitable for large-capacity and high-voltage level transmission lines, and cannot meet the requirements for the use of large-load poles and towers, so as to eliminate isotropy, increase insulation, and have good corrosion resistance. Effect

Inactive Publication Date: 2017-11-14
HEFEI DAZHUO ELECTRIC POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A heat treatment process for electric steel, the heat treatment process comprising the following steps:

[0024] (1) Put the power steel to be processed on the conveyor belt of the annealing furnace and start heating treatment;

[0025] (2) Raise the temperature of the annealing furnace. After the temperature of the annealing zone of the annealing furnace is heated up to 690°C at a rate of 5°C / s, the DX gas is introduced into the annealing furnace. The DX gas is incompletely generated by natural gas and air. The gas produced by the reaction;

[0026] (3) Introduce saturated steam into the bluing zone of the annealing furnace to bluish the electric steel that enters the bluing zone after heat treatment;

[0027] (4) The electric steel is quenched and cooled after being blued. During the quenching and cooling process, an appropriate amount of methanol or kerosene should always be dripped into the furnace to prevent oxidative decarburization;

[0028] (5) After quenching...

Embodiment 2

[0037] A heat treatment process for electric steel, the heat treatment process comprising the following steps:

[0038] (1) Put the power steel to be processed on the conveyor belt of the annealing furnace and start heating treatment;

[0039] (2) Raise the temperature of the annealing furnace. After the temperature of the annealing zone of the annealing furnace is heated up to 730°C at a rate of 15°C / s, DX gas is introduced into the annealing furnace. The DX gas is incompletely generated by natural gas and air. The gas produced by the reaction;

[0040] (3) Introduce saturated steam into the bluing zone of the annealing furnace to bluish the electric steel that enters the bluing zone after heat treatment;

[0041] (4) The electric steel is quenched and cooled after being blued. During the quenching and cooling process, an appropriate amount of methanol or kerosene should always be dripped into the furnace to prevent oxidative decarburization;

[0042] (5) After quenching, l...

Embodiment 3

[0051]A heat treatment process for electric steel, the heat treatment process comprising the following steps:

[0052] (1) Put the power steel to be processed on the conveyor belt of the annealing furnace and start heating treatment;

[0053] (2) Raise the temperature of the annealing furnace. After the temperature of the annealing zone of the annealing furnace is heated up to 710°C at a rate of 10°C / s, the DX gas is introduced into the annealing furnace. The DX gas is incompletely produced by natural gas and air. The gas produced by the reaction;

[0054] (3) Introduce saturated steam into the bluing zone of the annealing furnace to bluish the electric steel that enters the bluing zone after heat treatment;

[0055] (4) The electric steel is quenched and cooled after being blued. During the quenching and cooling process, an appropriate amount of methanol or kerosene should always be dripped into the furnace to prevent oxidative decarburization;

[0056] (5) After quenching,...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C21D1/30C21D1/18C21D1/74C23C8/18
CPCC21D1/30C21D1/18C21D1/74C23C8/18
Inventor 杨自芬
Owner HEFEI DAZHUO ELECTRIC POWER CO LTD
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