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Heat treatment process for improving low-temperature toughness of castings

A low temperature toughness, heat treatment furnace technology, applied in the field of heat treatment of alloy steel castings for high temperature pressure-bearing parts, can solve the problems of unstable low temperature impact performance, affecting product delivery time, losing customer orders, etc., to prevent quenching cracks and shorten product delivery. period, the effect of reducing material consumption

Inactive Publication Date: 2015-01-07
HUSN CASTING ANHUI YINGLIU GROUP
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AI Technical Summary

Problems solved by technology

Conventional casting heat treatment normalizing + tempering process is far from meeting the requirements of customers. If the new low-temperature impact performance requirements are not met, a large number of customer orders will be lost; unstable low-temperature impact performance will also prolong the production cycle and affect products. Delivery time, etc., bringing unnecessary negative impact to the group

Method used

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  • Heat treatment process for improving low-temperature toughness of castings
  • Heat treatment process for improving low-temperature toughness of castings

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Embodiment Construction

[0015] Referring to the accompanying drawings, a heat treatment process for improving low-temperature toughness of castings specifically includes the following steps:

[0016] (1) Furnace loading: select a stable quenching tray, and then place the casting to be quenched on the selected quenching tray in an upright, sideways or horizontal manner according to the structural characteristics of the casting to prevent Deform at high temperature, and then use the crane to lift the quenching tray containing the castings to be quenched to the trolley of the heat treatment furnace, and send it into the heat treatment furnace;

[0017] (2) Quenching: Turn on the heat treatment furnace for quenching treatment. The specific parameters are as follows: the furnace temperature of the heat treatment furnace is less than 350°C, the heating rate is controlled at ≤120°C / h, and the holding temperature is controlled at 960±15°C. The effective thickness of the quenched casting is selected. After th...

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Abstract

The invention discloses a heat treatment process for improving the low-temperature toughness of castings. According to the heat treatment process disclosed by the invention, conventional normalizing and tempering processes are replaced with quenching and tempering processes, so that the heat treatment process is easy to operate, economic and applicable; and on the premise of not changing existing heat treatment equipment (heating furnace) and quenching liquid (water) and avoiding the occurrence of cracks and the like, the heat treatment process can be performed, so that the cycle is shortened, the cost is saved, and the low-temperature impact toughness and stability of castings are significantly improved.

Description

technical field [0001] The invention relates to the technical field of heat treatment of alloy steel castings for high-temperature pressure-bearing parts, in particular to a heat treatment process for improving low-temperature toughness of castings. Background technique [0002] With the development of the times, many customers at home and abroad have imposed many strict requirements on the double-certified material WC9-1.7379. Such a material is alloy steel for high temperature, but it must meet the low temperature impact requirements of -29°C or lower. Conventional casting heat treatment normalizing + tempering process is far from meeting the requirements of customers. If the new low-temperature impact performance requirements are not met, a large number of customer orders will be lost; unstable low-temperature impact performance will also prolong the production cycle and affect products. Delivery time, etc., brought unnecessary negative impact to the group. Therefore...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D6/00
Inventor 杜应流姜成启孙成维陈焕存高绪云叶世如雷伦涛郑义
Owner HUSN CASTING ANHUI YINGLIU GROUP
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