Normalizing method for forging waste heat of steel
A technology of forging waste heat and normalizing, applied in the field of warm normalizing, can solve the problems of high cost, mixed crystals, large energy consumption, etc., and achieve the effect of prolonging the service life, preventing quenching cracks and reducing the amount of distortion.
Active Publication Date: 2016-08-24
王中忞
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[0002] The isothermal normalizing treatment of traditional steel consumes a lot of energy, the quality is unstable, sometimes mixed crystals appear, the cost is high, the labor intensity of the workers is heavy, and the construction period is long; due to the requirements of energy saving, emission reduction, green and low carbon, multiple utilization of waste heat, Especially for the multiple utilization of forging waste heat; due to the normalizing treatment of forging waste heat, the quality and technical indicators are difficult to reach the standard, and this problem can be solved by using the technical solution of the present invention
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[0122] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0123] Deformation degree:
[0124] From the point of view of metallurgy, above the recrystallization temperature, the plastic deformation process that does not cause work hardening is called thermal deformation processing. This is based on whether the metal undergoes work hardening after deformation processing; in fact, the metal also undergoes hardening during thermal deformation, but because the temperature of thermal deformation is much higher than the recrystallization temperature, the hardening caused by deformation is quickly eliminated simultaneously. Eliminated by the recrystallization process that occurs.
[0125] The degree of deformation is calculated by the following formula:
[0126] ϵ = H 0 - H ...
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The invention discloses a normalizing method for forging waste heat of steel. The normalizing method is characterized in that online controlled forging and cooling isothermal normalizing treatment for forging waste heat is implemented. The normalizing method comprises the following steps of controlled forging of the steel: controlling the forging temperature and the forging deformation degree of the steel, and refining grains by deforming and recrystallizing austenite; controlled cooling of the steel: controlling cooling rates, cooling uniformity and cooling efficiency of the steel at of all critical temperatures according to the principles of metallography and heat treatment; cooling the steel to a critical temperature and keeping the isothermality; finishing transformation of super-cooled austenite within the temperature range, thus obtaining fine grain structures; and after isothermal keeping, performing controlled cooling, namely controlling the cooling rate, the cooling uniformity, the cooling efficiency and a cooling final temperature after isothermal keeping, thus obtaining the normalizing method with structure and mechanical properties up to standards. According to the normalizing method disclosed by the invention, energy sources and resources can be saved, the normalizing treatment quality is improved, the normalizing treatment cost is reduced, the labor intensity of workers is reduced, labor productivity is improved, and the construction period is shortened.
Description
technical field [0001] The invention relates to a heat treatment method for steel, in particular to an isothermal normalizing method for forging waste heat controlled forging controlled cooling of steel. Background technique [0002] The isothermal normalizing treatment of traditional steel consumes a lot of energy, the quality is unstable, sometimes mixed crystals appear, the cost is high, the labor intensity of the workers is heavy, and the construction period is long; due to the requirements of energy saving, emission reduction, green and low carbon, multiple utilization of waste heat, Especially for the multiple utilization of forging waste heat; due to the normalizing treatment of forging waste heat, the quality and technical indicators are difficult to reach the standard, and this problem can be solved by using the technical solution of the present invention. Contents of the invention [0003] In order to solve the above technical problems, the present invention is a...
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IPC IPC(8): C21D1/28C21D1/84B21J5/00
CPCB21J5/00C21D1/28C21D1/84
Inventor 王中忞
Owner 王中忞
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