Low-temperature quenching method for medium-carbon steel workpiece

A low-temperature quenching and workpiece technology, applied in the field of quenching, can solve the problems of difficult control of steel deformation, easy deformation of steel, large internal stress, etc., and achieve the effect of workpiece quality up to standard and stable, control of shrinkage deformation, and reduction of internal stress.

Active Publication Date: 2013-10-09
凌伯勇
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  • Description
  • Claims
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Problems solved by technology

However, the cost of oil quenching is high, and the oil used at the same time remains on the workpiece, causing environmental pollution and waste of resources. In addition, the workpiece after oil quenching has disadvantages such as low hardness points, and the quality is not up to standard
[0005] Figure 7.18 on "Metallic Materials and Heat Treatment" discloses a schematic diagram of the ideal quenching rate of steel, such as figure 1 As shown, but the cooling rate of the steel is too fast, the internal stress is large, it is difficult to control the deformation of the steel, and the steel after quenching is easy to deform

Method used

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  • Low-temperature quenching method for medium-carbon steel workpiece

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Embodiment 1

[0034] Such as Figure 5 Shown, according to the method for low-temperature quenching of medium carbon steel workpiece of the present invention, the step of 45# steel workpiece quenching is as follows:

[0035] (1) Heat the 45# steel workpiece to 840° in the mesh belt furnace, and heat preservation treatment after heating, so that the internal structure of the workpiece is transformed into a uniform unsaturated austenite structure;

[0036] (2) Cool the medium-carbon steel workpiece in a constant temperature state to 727°C by slow cooling method, and then cool the workpiece temperature from 727°C to 650°C at the sealing barrel. The interior of the workpiece is a supercooled austenite quenching structure;

[0037] (3) The workpiece leaves the sealed barrel and goes straight into the deep water area. The solution in the deep water area can be water or 251AQ quenching agent aqueous solution, and the water temperature in the deep water area is 28°C. The cooling process is that t...

Embodiment 2

[0039] According to the method for low-temperature quenching of carbon steel workpiece in the present invention, the step of 60# steel workpiece quenching is as follows:

[0040] (1) Heat the 60# carbon steel workpiece to 810° in the mesh belt furnace, heat preservation treatment after heating, and the internal structure of the workpiece is transformed into a uniform unsaturated austenite structure;

[0041] (2) Cool the medium-carbon steel workpiece in a constant temperature state to 727°C by slow cooling method, and then cool the workpiece temperature from 727°C to 650°C at the sealing barrel. The interior of the workpiece is a supercooled austenite quenching structure;

[0042] (3) The workpiece leaves the sealed barrel and goes straight into the deep water area. The solution in the deep water area can be water or 251AQ quenching agent aqueous solution, and the water temperature in the deep water area is 32°C. The cooling process is that the workpiece is rapidly cooled fro...

Embodiment 3

[0044] According to the method for low-temperature quenching of carbon steel workpiece in the present invention, the step of 25# steel workpiece quenching is as follows:

[0045](1) Heat the 25# carbon steel workpiece to 890° in the mesh belt furnace, and then perform heat preservation treatment after heating, so that the internal structure of the workpiece is transformed into a uniform unsaturated austenite structure;

[0046] (2) Cool the medium-carbon steel workpiece in a constant temperature state to 727°C by slow cooling method, and then cool the workpiece temperature from 727°C to 650°C at the sealing barrel. The interior of the workpiece is a supercooled austenite quenching structure;

[0047] (3) The workpiece leaves the sealed barrel and goes straight into the deep water area. The solution in the deep water area can be water or 251AQ quenching agent aqueous solution, and the water temperature in the deep water area is 32 °C. The cooling process is that the workpiece ...

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Abstract

The invention discloses a low-temperature quenching method for a medium-carbon steel workpiece, which comprises the following steps of: (I) heating a medium-carbon steel workpiece and preserving heat so as to convert the internal structure of the workpiece into a uniform and consistent unsaturated austenite structure; (II) cooling the obtained medium-carbon steel workpiece by a slow cooling method, wherein the inside of the workpiece is a cold austenite quenching structure; and (III) putting the obtained medium-carbon steel workpiece into water or an aqueous solution of a quenching agent for quick cooling to finish the quenching. The low-temperature quenching method for a medium-carbon steel workpiece, disclosed by the invention, can reduce internal stress of the workpiece in quenching and control the deformation quantity, has low cost, realizes up-to-standard workpiece quality, and is environment-friendly and stable.

Description

technical field [0001] The invention relates to the technical field of quenching, in particular to a method for low-temperature quenching of medium-carbon steel workpieces. Background technique [0002] At present, there are two methods of quenching medium carbon steel workpieces: water quenching and oil quenching. The faster the cooling rate, the greater the internal stress and the larger the deformation. When the deformation exceeds a certain strength of the material, the workpiece will crack. [0003] When using medium-carbon molten steel for quenching, the cooling rate is too fast, resulting in excessive internal stress, medium-carbon steel workpieces will be deformed, or even cracked, or because the workpiece is small and difficult to operate, quench with a lead wire string machine, such as 481H gasket 45# For steel workpieces, the heating temperature is set at 780°C, combined with stringing and binding, heating in a salt bath furnace, and cooling in a water pool. Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D1/19
Inventor 凌伯勇
Owner 凌伯勇
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