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Heat treatment technology of steel castings

A technology for steel castings and processes, which is applied in the field of heat treatment of steel castings, can solve the problems of high post-processing costs and insufficient mechanical properties of steel castings, and achieves small post-processing workload, low heat treatment costs, and casting dimensional accuracy. high effect

Inactive Publication Date: 2013-04-24
QINGDAO MELPER PRECISION CASTING & MACHINERY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In order to overcome the above-mentioned problems existing in the prior art field, the object of the present invention is to provide a heat treatment process for steel castings, which solves the problems that the post-processing cost of the current heat treatment process is high and the mechanical properties of the steel castings are not brought into play.

Method used

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Embodiment

[0020] The steel casting heat treatment process of the present embodiment, the heat treatment process comprises the following operations:

[0021] (1) Normalizing. Determine the steel type of the steel casting, determine different normalizing temperatures according to different steel types, determine the holding time according to the thickness of the steel casting, and then naturally cool to room temperature;

[0022] (2) Quenching. After heating for a certain period of time, observe the heating color of the steel casting until it reaches the point of burning through, then it is quenched out of the furnace, cooled with water, and the critical cooling rate is reached, and the crystallization is martensite;

[0023] (3) Tempering. Temper the cast steel in step (2) inside the skull, raise the furnace temperature to be lower than the quenching temperature, keep it for a period of time, keep it warm, and cool it with water when it comes out of the furnace.

[0024] It also inclu...

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Abstract

The invention discloses a heat treatment technology of steel castings. The heat treatment technology comprises: (1) normalizing, comprising determining types of the steel castings, then determining different normalizing temperatures in accordance with different types, determining insulation time in accordance with thickness of the steel castings, and naturally cooling to a normal temperature; (2) quenching, comprising heating for a certain time, meanwhile observing a heated color of the steel castings until the steel castings is completely burnt, taking out of a furnace and quenching, cooling with water so as to reach a critical cooling rate, and then crystallizing into a martensite; and (3) tempering, comprising tempering the steel castings of step (2) in the furnace, heating the furnace to be below a quenching temperature and then keeping for a while, keeping warm, taking out of the furnace and cooling with water. The technology is easy and understandable, improves mechanical properties of the steel castings, and is quite low in heat treatment cost, small in post-treatment workload on casting surfaces, and high in size precision of the castings.

Description

[0001] technical field [0002] The invention belongs to a casting process, and in particular relates to a heat treatment process for a steel casting. [0003] Background technique [0004] Investment precision steel castings are widely used in aviation, aerospace, and weapon industries. With the continuous development of casting technology, the requirements for investment precision steel castings are also getting higher and higher. Vacuum heat treatment or annealing heat treatment is usually used in the existing casting technology. After heat treatment, the casting is processed by grinding or machining, which will increase the post-processing cost of the casting and increase the workload of the workers; the mechanical properties of the annealing heat treatment are not developed. [0005] Contents of the invention [0006] In order to overcome the above-mentioned problems existing in the prior art field, the object of the present invention is to provide a heat treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/28C21D1/68C21D1/70C21D6/00
Inventor 昌月军
Owner QINGDAO MELPER PRECISION CASTING & MACHINERY
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