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Steel isothermal quenching-tempering cooling technology

A technology of austempering and cooling technology, which is applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc. It can solve the problems that the quality and technical indicators of large workpieces are difficult to meet the standards, there is no breakthrough in the hardenability of steel, and the energy consumption of heat treatment is large. Solve hardenability problems, improve heat treatment quality, and protect the environment

Active Publication Date: 2012-07-25
王长文
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Traditional iron and steel heat treatment consumes a lot of energy, causes serious pollution, heavy labor, backward technology, and high cost; the theoretical level of heat treatment in my country is not low, and it is fundamentally how to use heat treatment theory to guide heat treatment practice. The combination of theory and practice ensures the quality of parts and makes parts One tops several, which is the key to heat treatment; due to the lack of breakthrough in the hardenability of steel, it is difficult to meet the quality and technical indicators at 1 / 2T of large workpieces

Method used

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  • Steel isothermal quenching-tempering cooling technology
  • Steel isothermal quenching-tempering cooling technology
  • Steel isothermal quenching-tempering cooling technology

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Embodiment Construction

[0068] Heat treatment difficulty factor:

[0069] After the steel is heated and transformed into austenite, it does not transform immediately after cooling in water to the critical point A1. The austenite existing at this time is called supercooled austenite. When the supercooled austenite is cooled to a certain temperature lower than Ar1, it will decompose and transform into other organizations.

[0070] The difficulty factor of heat treatment is that after the steel is austenitized (the temperature inside and outside the workpiece is uniform, the austenite is homogenized, the phase transformation is completed, the austenite grains cannot grow, and the cost is low), the core part is cooled in water. When it reaches a certain temperature lower than Ar1, it will decompose and transform into martensite or lower bainite.

[0071] The heat treatment difficulty coefficient is calculated by the formula:

[0072] the

[0073] In the formula, N — heat treatment difficulty coeffic...

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Abstract

The invention relates to a steel isothermal quenching-tempering cooling technology in which the 'difficulty coefficient of heat treatment' is defined with innovative thought, the 'bainite transformation isothermal quenching cooling manner' is redefined and the 'traditional unique cooling manner' is subverted, so that the traditional steel hardenability theory is overturned, a brand new steel harednability theory is established, and the steel hardenability is greatly improved. After austenitizing, the steel is not cooled completely in water, the energy difference between the surface of the steel and the water is increased through temperature returning so that water cooling speed is improved again and the steel harednability is improved; temperature is returned again, waste heat is used forisothermality; mid-high temperature tempering is carried out, incomplete water cooling is adopted for preventing a secondary temper brittleness, and secondary bainite quenching and self tempering treatment are carried out through temperature returning by utilizing waste heat. The technical effect of the steel isothermal quenching-tempering cooling technology is as follows: a large amount of energy and resources are saved, heat treatment cost is lowered, the environment is protected, the labor intensity of a labor is relieved, the heat treatment quality is improved, the problem of hardenability of toughness heat treatment of a large workpiece at the position of 1 / 2T is solved, the processes are combined, and energy is saved and emission is reduced.

Description

technical field [0001] The invention relates to a steel heat treatment process, in particular to a steel austempering-tempering cooling process. Background technique [0002] Traditional iron and steel heat treatment consumes a lot of energy, causes serious pollution, heavy labor, backward technology, and high cost; the theoretical level of heat treatment in my country is not low, and it is fundamentally how to use heat treatment theory to guide heat treatment practice. The combination of theory and practice ensures the quality of parts and makes parts One tops several, which is the key to heat treatment; since there is no breakthrough in the hardenability of steel, it is difficult to meet the quality and technical indicators at 1 / 2T of large workpieces. Contents of the invention [0003] The purpose of the present invention is to provide a steel austempering-tempering cooling process, which saves a lot of energy and resources, reduces the cost of heat treatment, p...

Claims

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Application Information

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IPC IPC(8): C21D1/20C21D11/00
Inventor 王长文
Owner 王长文
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