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Superfast heat treatment method of high-speed steel

A heat treatment method and high-strength steel technology, applied in the field of heat treatment, can solve problems such as waste of energy, environmental pollution, low efficiency of high-strength steel heat treatment, etc., and achieve the effects of novel and unique methods, high work efficiency, and easy operation

Inactive Publication Date: 2018-11-09
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above situation, in order to overcome the defects of the prior art, the object of the present invention is to provide an ultra-fast heat treatment method for high-strength steel, which can effectively solve the problems of low heat treatment efficiency, waste of energy and environmental pollution for high-strength steel

Method used

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Effect test

Embodiment 1

[0012] In the specific implementation of the present invention, an ultra-rapid heat treatment method for high-strength steel is to use a ceramic sheet electric heating device to rapidly heat the high-strength steel. The current range of the single-chip ceramic heating sheet is ≤ 15A, and the power of the single-chip ceramic heating sheet ≤3.3KW, the heating module is composed of 36 pieces of ceramic heating chips, that is, arranged in 6×6, the total number of heating modules is ≤20, and the module is arranged in a single layer. Heat the high-strength steel from room temperature to the peak temperature Tp within seconds, then keep it warm for 5-10 seconds, and then use a fan to cool it. The air volume of a single fan is ≤154000m 3 / h, 7 levels of air volume adjustment of 0%, 10%, 30%, 50%, 70%, 90% and 100%, the number of fans is 2 to 4, by adjusting the air volume of the fans, the high-intensity The steel is cooled to room temperature, and the whole process is completed within...

Embodiment 2

[0014] An ultra-rapid heat treatment method for high-strength steel of the present invention is that the high-strength steel is a wire rod with a diameter of 5mm, and the high-strength steel contains 0.22%C, 0.25%Si, 1.5%Mn, 1.2%Cr, and the rest is iron and impurities element;

[0015] Then carry out rapid heat treatment, the Ac3 of the wire rod is 910°C, the maximum heating rate is 405°C / s, and the maximum cooling rate exceeds 3050°C / s; the high-strength steel wire rod enters the heat treatment device at a feeding speed of 50cm / min for continuous operation. Heating the wire rod from room temperature to a peak temperature of 1080°C within 30 seconds, then holding it for 6 seconds, and then cooling it to room temperature within 8 seconds, the whole process took 44 seconds;

Embodiment 3

[0017] An ultra-rapid heat treatment method for high-strength steel of the present invention is that the high-strength steel is a steel strip with a thickness of 3mm, and the chemical composition contains 0.25%C, 0.22%Si, 1.3%Mn, 0.4%Mo, 0.4%Ni, 0.25% by weight. %Cu, 0.45%Cr, the rest are iron and impurity elements,

[0018] Then conduct rapid heat treatment, the Ac3 of the wire rod is 980°C, the maximum heating rate is 408°C / s, and the maximum cooling rate exceeds 3060°C / s; the high-strength steel wire rod enters the heat treatment device at a feeding speed of 48cm / min for continuous operation. The wire rod was heated from room temperature to a peak temperature of 1120°C within 28 seconds, then held for 7 seconds, and then cooled to room temperature within 9 seconds. The whole process took 44 seconds.

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Abstract

The invention relates to a superfast heat treatment method of high-speed steel. The problems that high-strength steel is low in heat treatment efficiency, wastes energy and pollutes the environment are solved. According to the method, a heating device is adopted to heat the high-strength steel to the peak temperature Tp from the room temperature within 30 s, heat preservation is carried out for 5to 10 s, a cooling device is used for cooling the high-strength steel to the room temperature within 5 to 10 s, and the whole process is finished within 60 s; the high-strength steel is a steel wire or steel strip with the carton content ranging from 0.16 to 0.55% and the diameter or thickness being 5 mm or below; Tp exceeds the austenite transformation temperature Ac3 by more than 50 DEG C, Tp isequal to 1000 to 1200 DEG C, the maximum heating speed exceeds 400 DEG C / s, the maximum cooling speed exceeds 3000 DEG C / s, and 50cm / min continuous work is achieved. The method is novel and unique, scientific and reasonable, easy to operate, convenient to use, high in work efficiency, energy-saving, environment-friendly and capable of being widely applied to heat treatment strengthening of thin-specification steel strips and small-specification wire rods, and the method is creation of the high-strength steel heat treatment.

Description

technical field [0001] The invention relates to heat treatment, in particular to an ultra-rapid heat treatment method for high-strength steel in iron and steel metallurgy and metal heat treatment. Background technique [0002] Due to the advantages of reducing wall thickness and self-weight and improving structural bearing capacity, high-strength steel and ultra-high-strength steel have been widely used in automobiles, construction machinery, construction, bridges and other fields. [0003] Due to the dual requirements of increasing body structure strength and increasingly stringent fuel consumption and emissions, the car body urgently needs high-strength steel to increase the load-carrying capacity and reduce its own weight to reduce emissions. Steel materials for car bodies usually require follow-up processing and heat treatment to complete parts processing. Therefore, while high-strength steel or ultra-high-strength steel for automobiles requires high strength, it general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D1/34
CPCC21D9/52C21D1/34
Inventor 唐明奇冯在强李刚金向杰
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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