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Isothermal normalizing process for Fe-Si alloy steel

An isothermal normalizing and fe-si technology, applied in the field of alloy steel heat treatment, can solve the problems of poor operation controllability, uneven grain growth, poor structure uniformity, etc., to achieve improved temperature controllability, uniform and fine structure Effect of crystallization and grain refinement

Pending Publication Date: 2022-05-13
马鞍山市鑫龙特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the isothermal normalizing process can improve the mechanical properties of alloy steel, due to the strict requirements of isothermal normalizing on the process, the current isothermal normalizing process is often inaccurate because of the timing and parameters of cooling speed, cooling time or heating temperature. As a result, there are problems of uneven growth of actual grains, poor structure uniformity, and poor operation controllability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of Fe-Si alloy steel material isothermal normalizing process, comprises the steps:

[0026] S1, heating and heat preservation:

[0027] Put the Fe-Si alloy steel in the heating box of the isothermal normalizing furnace for heat treatment, and complete the heat preservation treatment for 1 hour. The temperature of the heat treatment is 920°C. The magnetic field treatment is carried out while the heat preservation is carried out, and the magnetic field intensity is constant by adjusting the current and voltage. Yes, the power of the magnetic field is 1200W;

[0028] S2, quick cooling:

[0029] Immediately place the alloy steel after heat preservation in step S1 in a liquid nitrogen tank for rapid cooling for 10 minutes, and at the same time of rapid cooling, process the ultrasonic environment in the liquid nitrogen tank with an ultrasonic frequency of 30 kHz;

[0030] S3, isothermal treatment:

[0031] Place the alloy steel after the rapid cooling treatment in s...

Embodiment 2

[0037] A kind of Fe-Si alloy steel material isothermal normalizing process, comprises the steps:

[0038] S1, heating and heat preservation:

[0039] Put the Fe-Si alloy steel in the heating box of the isothermal normalizing furnace for heat treatment, and complete the heat preservation treatment for 1.5 hours. The temperature of the heat treatment is 935°C. The magnetic field treatment is carried out while the heat preservation is carried out, and the magnetic field is constant by adjusting the current and voltage. Intensity, the power of the magnetic field is 1350W;

[0040] S2, quick cooling:

[0041] Immediately place the alloy steel after heat preservation in step S1 in a liquid nitrogen tank for rapid cooling for 11 minutes, and at the same time of rapid cooling, process the liquid nitrogen tank in an ultrasonic environment with an ultrasonic frequency of 40 kHz;

[0042] S3, isothermal treatment:

[0043] Place the alloy steel after the rapid cooling treatment in ste...

Embodiment 3

[0048] A kind of Fe-Si alloy steel material isothermal normalizing process, comprises the steps:

[0049] S1, heating and heat preservation:

[0050] Put the Fe-Si alloy steel in the heating box of the isothermal normalizing furnace for heat treatment, and complete the heat preservation treatment for 2 hours. The temperature of the heat treatment is 950 ° C. The magnetic field treatment is carried out while the heat preservation is carried out, and the magnetic field intensity is constant by adjusting the current and voltage. Yes, the power of the magnetic field is 1500W;

[0051] S2, quick cooling:

[0052] Immediately place the alloy steel after heat preservation in step S1 in a liquid nitrogen tank for rapid cooling for 12 minutes, and at the same time of rapid cooling, process the ultrasonic environment in the liquid nitrogen tank with an ultrasonic frequency of 50 kHz;

[0053] S3, isothermal treatment:

[0054] Place the alloy steel after the rapid cooling treatment i...

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Abstract

The invention discloses an isothermal normalizing process for Fe-Si alloy steel, and relates to the technical field of alloy steel heat treatment, the isothermal normalizing process comprises the following steps: S1, heating and heat preservation; s2, quick cooling; s3, isothermal treatment; and S4, cooling after isothermal treatment. According to the isothermal normalizing process for the Fe-Si alloy steel, an existing isothermal normalizing process is improved to a great extent, magnetic field treatment is carried out in the heat preservation stage of heating and heat preservation, uneven growth of crystal grains is avoided through magnetic field treatment, the crystal grains are refined through magnetic field treatment, the influence of temperature factors on crystal grain growth is reduced, and the quality of the Fe-Si alloy steel is improved. Liquid nitrogen is adopted for rapid cooling, the effect of uniform and rapid cooling is achieved by means of the cavitation effect, the acoustic streaming effect and other effects of ultrasonic waves, the structure uniformity is further improved, finally isothermal treatment and equal greeting treatment are conducted, and at the moment, the grain uniformity, the structure uniformity and refinement and the temperature controllability are improved immediately; and therefore, the performance of the Fe-Si alloy steel is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of alloy steel heat treatment, and in particular relates to an isothermal normalizing process for Fe-Si alloy steel. Background technique [0002] Normalizing is a heat treatment process in which steel or steel parts are heated to an appropriate temperature above the critical point As or Acm, kept for a certain period of time and then cooled in air to obtain pearlite-like structures. Normalizing is a traditional old process, which has been widely used because of its simple equipment and process requirements and low energy consumption. With the development of the automobile industry and the improvement of product quality requirements, especially the introduction of diversification of steel materials for vehicle models, the ordinary normalizing process can no longer meet the requirements of pre-heat treatment of tooth blanks. In actual production, the normalizing heating temperature is often slightly higher t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D1/04C21D6/04
CPCC21D1/28C21D1/04C21D6/008C21D6/04
Inventor 高欣王军
Owner 马鞍山市鑫龙特钢有限公司
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