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Heat treatment method of 35CrMo steel casting

A heat treatment method and a technology for steel castings, which are applied in the field of heat treatment of steel castings, can solve the problems that the heat treatment time should not be too long, and achieve the effects of shortening the production cycle, qualified mechanical properties, and reducing production costs

Inactive Publication Date: 2020-10-30
NINGBO JINHUI PRECISION CASTING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, on the premise that the chemical elements are basically unchanged, if you want to improve the mechanical properties of steel castings, you can start with the adjustment of the heat treatment process. The heat treatment process involves temperature, treatment time, normalizing, tempering cycle, cooling temperature, cooling rate, etc. Although it is not as complicated as the adjustment of chemical elements, the fine-tuning of each parameter will also bring unpredictable results to the performance of 35CrMo steel castings. Therefore, it is necessary to obtain a complete set of mutual cooperation and effectively improve the mechanical Performance, while the heat treatment process should not be too long, still has a certain degree of difficulty

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  • Heat treatment method of 35CrMo steel casting
  • Heat treatment method of 35CrMo steel casting

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Embodiment 1

[0016] A kind of 35CrMo steel casting heat treatment method, the step comprises

[0017] a. Heat the 35CrMo casting to a temperature of 930°C~950°C, and keep it warm; the holding time is: for castings with a wall thickness 50mm, every increase in wall thickness 25mm or even less than 25mm is calculated as 25mm, and the holding time is increased by 1 hour. Based on the wall thickness value of the largest piece and the thickest part loaded in each furnace, determine the holding time, so that the internal heat of the steel casting can be penetrated and the structure transformation is complete;

[0018] b. Take the 35CrMo castings out of the furnace, and use air cooling to cool the 35CrMo castings at a cooling rate of 50°C / min to 100°C / min until the 35CrMo castings are cooled below 200°C, and then use air cooling to naturally Cool to room temperature;

[0019] c. Heat and temper the cooled 35CrMo steel castings to 720°C, carry out heat preservation and air cooling, the heat pres...

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Abstract

The invention discloses a heat treatment method of a 35CrMo steel casting. The heat treatment method comprises the following steps that a, the 35CrMo steel casting is heated to 930-950 DEG C, and heatpreservation is carried out; b, the 35CrMo steel casting is discharged out of the furnace, air cooling is adopted, the 35CrMo steel casting is cooled till the temperature of the 35CrMo steel castingis reduced to 200 DEG C or below, and then the 35CrMo steel casting is naturally cooled to the room temperature in an air cooling mode; and c, the cooled 35CrMo steel casting is heated and tempered to720 DEG C, and air cooling is carried out after heat preservation; When the process is adopted for heat treatment, on the basis that the heat treatment process is reduced and the heat treatment period is shortened, the mechanical property of the obtained 35CrMo steel casting meets the standard requirement, the production cost is reduced, and the production period is shortened.

Description

technical field [0001] The invention relates to heat treatment of steel castings, in particular to a heat treatment method for 35CrMo steel castings. Background technique [0002] The internal factors affecting the mechanical properties of steel castings are the characteristics of the material itself; the external factors are the test temperature and so on. When the external factors remain stable or unchanged, for steel castings, to improve the mechanical properties, if we start from the internal factors, the technical means adopted are to improve by adjusting the chemical composition or heat treatment process or the joint action of the two. Most chemical element adjustments lead to improved mechanical properties. But specifically what element content to increase, how much to increase, what element content to reduce, and how much to reduce, in order to obtain optimal mechanical properties, it needs to be determined according to the specific composition standard requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/28C22C38/02C22C38/04C22C38/44
CPCC21D1/28C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/44
Inventor 任国良熊六一朱伟魏红星刘超
Owner NINGBO JINHUI PRECISION CASTING
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