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Heat treatment method of steel

A heat treatment method and cold treatment technology, applied in the field of steel treatment technology, can solve problems such as reducing the quality of heat-treated products, and achieve the effects of good comprehensive mechanical properties, improved and pressure processing performance, and improved cutting performance.

Inactive Publication Date: 2020-05-12
东台市宏凯不锈钢有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The quenching method in the prior art is not good for quenching with ordinary solutions, and it is easy to reduce the quality of heat-treated products

Method used

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Embodiment Construction

[0029] The present invention is further described below through specific examples, but the present invention is not limited only to the following examples. Within the scope of the present invention or without departing from the content, spirit and scope of the present invention, changes, combinations or substitutions to the present invention are obvious to those skilled in the art and are included in the scope of the present invention Inside.

[0030] A heat treatment method for steel, the heat treatment method comprising the following steps:

[0031] (1) Annealing: After heating the steel piece to the temperature of Ac3+30-50℃ or Ac1+30-50℃ or below Ac1, it is slowly cooled with the furnace temperature;

[0032] (2) Normalizing: heat the steel to 30-50°C above Ac3 or Accm, and cool at a cooling rate greater than that of annealing after heat preservation;

[0033] (3) Quenching: Heating the steel piece to the phase transition temperature Ac3 or Ac1, keeping it warm for a per...

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Abstract

The invention discloses a heat treatment method of steel. The heat treatment method of the steel comprises the following steps of (1) annealing, specifically, after a steel part is heated to enable the temperature to be Ac3+30-50 DEG C or Ac1+30-50 DEG C or below Ac1, the steel part is slowly cooled along with the furnace temperature; (2) normalization; (3) quenching; (4) tempering, specifically,the quenched steel part is heated again to enable the temperature to be below Ac1, and the steel part is cooled in the air or oil or hot water or water after heat preservation is accomplished; (5) hardening and tempering; (6) aging, specifically, the steel part is heated to enable the temperature to range from 80 DEG C to 200 DEG C, the heat preservation is conducted for 5-20 hours, and the steelpart is taken out and cooled in the air along with a furnace; (7) cold treatment; (8) flame heating surface quenching; (9) induction heating surface quenching; (10) carburization; (11) nitridation; and (12) nitrocarburizing. The hardness, the wear resistance, the fatigue strength and the corrosion resistance of the surface of the steel part are improved, the cutting machining performance is improved, and the smoothness of the machined surface is improved. The deformation and cracks formed in the quenching process are reduced, and the good comprehensive mechanical properties are obtained.

Description

technical field [0001] The invention relates to the field of steel treatment technology, in particular to a steel heat treatment method. Background technique [0002] The quenching of steel is to heat the steel to a certain temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), keep it warm for a period of time to melt all or part of the austenite, and then cool it at a rate greater than the critical cooling rate. A heat treatment process in which the cooling rate is rapidly cooled to below Ms (or isothermal near Ms) for martensite (or bainite) transformation. Usually, the solid solution treatment of aluminum alloy, copper alloy, titanium alloy, tempered glass and other materials or the heat treatment process with rapid cooling process is called quenching. [0003] The quenching method in the prior art is not good for quenching with ordinary solutions, and the quality of heat-treated products is likely to be reduced. For example...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/08C21D1/10C21D1/18C21D1/26C21D1/28C21D6/04C23C8/00
CPCC21D1/08C21D1/10C21D1/18C21D1/26C21D1/28C21D6/00C21D6/04C23C8/00Y02P10/25
Inventor 潘勇马维根王长西王奎山刘冬喜
Owner 东台市宏凯不锈钢有限公司
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