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Air quenching heat treatment process for high-chromium cast iron castings

A high-chromium cast iron and casting technology, used in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as quenching cracks in products with internal stress, shell strength that cannot withstand stress, and fast martensite transformation, and achieve stable quality. , Conducive to quality control, the effect of balanced hardness performance

Pending Publication Date: 2021-11-30
ANHUI CONCH KAWASAKI EQUIP MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional cooling device and heat treatment process often cause martensitic transformation to occur preferentially due to the rapid drop of the surface temperature of the high-temperature section, forming a low-strength shell. Unable to withstand the stress generated by tissue transformation, resulting in cracks;
[0004] The starting temperature of martensite transformation of this material is often low, and the Ms point temperature is about 180-200°C. Rapid cooling of castings in this temperature range will cause the martensite transformation speed to be too fast, resulting in great internal stress and resulting in product failure. quenching crack

Method used

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  • Air quenching heat treatment process for high-chromium cast iron castings
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  • Air quenching heat treatment process for high-chromium cast iron castings

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Embodiment 1

[0036] In this embodiment, the heat treatment device is used to heat treat the workpiece 2 42, including the furnace loading and stacking of the casting 4, heating up and cooling out of the furnace, and the specific steps are as follows:

[0037] Step 1: Place the workpiece 2 42 on the heat treatment furnace trolley 1 in the form of double rows and double layers, ensuring that the distance between the front and rear of the workpiece 2 42 is 350 mm, the distance between the left and right sides is 300 mm, and the distance between the upper and lower sides is 250 mm, and the middle is supported by hollow pad iron to ensure good ventilation Effect;

[0038] Step 2: Workpiece 2 42 enters the furnace to heat up, and check the sealing condition of the furnace door of the heat treatment furnace, and keep it at 1020°C for 7 hours. The specific heating process is as follows:

[0039] a: When the temperature of workpiece 242 is below 300°C, the heating rate is 150°C / h, and the holding t...

Embodiment 2

[0048] The heat treatment device of this embodiment performs heat treatment on the workpiece 41. The complete process includes the furnace loading and stacking of the casting 4, heating up and cooling out of the furnace. The specific steps are as follows:

[0049] Step 1: Place the workpiece 141 yards on the heat treatment furnace trolley 1. Since the casting 4 is large in size, it is stacked in a single row and single layer to ensure that the distance between the front and rear of the casting 4 is 400mm;

[0050] Step 2: Casting 4 enters the furnace to heat up, and check the sealing of the furnace door of the heat treatment furnace, and keep it at 1010°C for 9 hours. The specific heating process is as follows:

[0051] a: When the temperature of workpiece 141 is below 300°C, the heating rate is 130°C / h, and the holding time at 300°C is 2-3 hours;

[0052] b: When the temperature of the workpiece 141 is at the stage of 300-500°C, the heating rate is 60°C / h, and the holding tim...

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Abstract

The invention discloses an air quenching heat treatment process for high-chromium cast iron castings, and relates to the field of heat treatment of iron-based wear-resistant materials. The air quenching heat treatment process comprises the following steps of: stacking the castings on a trolley; then, feeding the castings into a furnace for heating; and then, carrying out air quenching heat treatment, wherein an air quenching high-temperature cooling stage of the castings is 850-1050 DEG C, monitoring environment temperature, and regulating a fan according to the environment temperature. The air quenching heat treatment process is simple in structure, is high in degree of automation, and automatically regulates rotation speed of the fan according to the environment temperature and actual temperature drop during casting cooling, so that cooling speed of the castings at different temperature stages is controlled, the optimal cooling rate is guaranteed, and influences, on a process at a casting heat treatment cooling stage, of the environment temperature are reduced; and meanwhile, the castings produced by the heat treatment process are stable in quality, are relatively small in proportion deviation of the same material structure, and are balanced in strength and hardness performances, so that excellent wear resistance is guaranteed, and quality control in a heat treatment process is facilitated.

Description

technical field [0001] The invention relates to the technical field of electronic equipment protection, in particular to an air quenching heat treatment process for high chromium cast iron castings. Background technique [0002] High chromium cast iron is a kind of anti-wear material with excellent performance that has received special attention. It is widely used in cement industry and electric power industry, mainly in grinding equipment for limestone raw materials and raw coal. High chromium cast iron castings often have a relatively large thickness in terms of product structure, usually 150mm-300mm. In order to ensure the consistency of the hardness of the core of the casting and the hardness of the surface, a certain proportion of Mo element needs to be added to improve the hardenability of heat treatment. At present, in the industry High-temperature hardening and quenching at 950°C-1050°C is widely used to improve the final hardness of the material. The cooling method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D6/00C21D11/00
CPCC21D1/18C21D11/005C21D6/002
Inventor 裴学成王雷周宝屈庆云杨新明
Owner ANHUI CONCH KAWASAKI EQUIP MFG
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