Heat treatment process for large-scale pump cases

A technology for heat treatment furnaces and pump casings, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of difficult to find quenching and tempering units, high cost, large size, etc., to save heat preservation time, avoid processing, and save heat treatment cost effect

Active Publication Date: 2018-12-25
新乡市长城铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large size of the product (the size reaches 5350×5250×1960mm), it is difficult to find a suitable conditioning unit. Even if there is a suitable conditioning unit, the cost of conditioning is very expensive. Once the conditioning process is controlled If it is not good, it will also bring quality hidden dangers such as cracks and deformation.

Method used

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  • Heat treatment process for large-scale pump cases
  • Heat treatment process for large-scale pump cases
  • Heat treatment process for large-scale pump cases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The large-scale pump casing formed by casting according to the internal control chemical composition is cleaned and sanded, then put into a large-scale heat treatment furnace for annealing treatment, heated to 650°C at a heating rate of 70°C / h and kept for 1 hour, and then heated at a rate of 70°C / h Heat at a speed of 880°C for 10 hours, then cool the furnace to 350°C and pull out the cutting riser with temperature, the cutting temperature is 200°C;

[0027] (2) After cutting the riser, put it back into the heat treatment furnace for normalizing process, then heat it to 700°C at a heating rate of 60°C / h and keep it for 2 hours, and then heat it to 890°C at a heating rate of 70°C / h Keep warm at ℃ for 12 hours, then take it out of the oven and blow it with strong wind and spray (fog quenching);

[0028] (3) Finally, pull the pump casing into the heat treatment furnace for tempering process, heat it to 660°C at a heating rate of 60°C / h and keep it for 10 hours, then cool i...

Embodiment 2

[0030] (1) Clean the large-scale pump casing formed according to the internal control chemical composition, clean the sand, put it into a large-scale heat treatment furnace for annealing treatment, heat it to 690°C at a heating rate of 72°C / h for 2 hours, and then heat it at 72°C / h The heating rate of h is heated to 890°C for 15 hours, and then the furnace is cooled to 400°C to pull out the cutting riser with temperature, and the cutting temperature is 220°C;

[0031] (2) After cutting the riser, put it back into the heat treatment furnace for normalizing process, then heat it to 710°C at a heating rate of 65°C / h and keep it for 3 hours, and then heat it to 950°C at a heating rate of 72°C / h Keep warm at ℃ for 20 hours, then take out the furnace and blow strong wind and spray (fog quenching);

[0032] (3) Finally, pull the pump casing into the heat treatment furnace for tempering process, heat it to 620°C at a heating rate of 67°C / h and keep it for 15 hours, then cool it to 500...

Embodiment 3

[0034] (1) Clean the large-scale pump casing formed by casting according to the internal control chemical composition, clean the sand, put it into a large-scale heat treatment furnace for annealing treatment, heat it to 720°C at a heating rate of 80°C / h for 3 hours, and then heat it at 80°C / h The heating rate of h is heated to 950°C for 10 hours, and then the furnace is cooled to 500°C to pull out the cutting riser with temperature, and the cutting temperature is 230°C;

[0035] (2) After cutting the riser, put it back into the heat treatment furnace for normalizing process, then heat it to 650°C at a heating rate of 80°C / h and keep it for 3 hours, and then heat it to 880°C at a heating rate of 80°C / h Keep warm at ℃ for 15 hours, then take it out of the furnace and blow it with strong wind and spray (fog quenching);

[0036] (3) Finally, pull the pump casing into the heat treatment furnace for tempering process, heat it to 610°C at a heating rate of 80°C / h and keep it for 20 h...

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Abstract

The invention provides a heat treatment process for large-scale pump cases. The process comprises the following steps: (1) cleaning sand in a large-scale pump case which is cast according to internalcontrol chemical components, loading the large-scale pump case into a large-scale heat treatment furnace to carry out annealing, and pulling out the large-scale pump case to cut dead head at the temperature; (2) after the dead head is cut, reloading the large-scale pump case into the heat treatment furnace to carry out a normalization process, and taking the large-scale pump case out from the furnace to blow strong wind and mist (fog quenching); (3) finally, pulling the pump case into the heat treatment furnace to carry out a tempering process, and finally taking the pump case out from the furnace to carry out air cooling. Compared with traditional processes with the same material, the process has the advantage that a tempering process is eliminated, so that the heat treatment time and heat treatment cost are reduced. Moreover, the process is changed from hardening and tempering from normalization, so that expensive hardening and tempering cost is reduced.

Description

technical field [0001] The invention belongs to the heat treatment technology of casting technology, and in particular relates to a heat treatment process of a large pump casing, in particular to a heat treatment process for low-alloy high-strength NiCrMo steel. Background technique [0002] The material of the large pump casing is ZG30NiCrMo, which meets the chemical composition and performance required by JB / T6402-2006. However, there is no clear heat treatment process and hardness requirements in the standard. The customer's technical requirements not only require the mechanical properties of the product to meet the requirements, but also perform a hardness check on the casting body, and require that the hardness value correspond to the tensile strength. According to the material characteristics of the product, the heat treatment method generally adopted for this kind of steel is normalizing + tempering + quenching and tempering (quenching + tempering). However, due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/26C21D1/28
CPCC21D1/26C21D1/28C21D9/0068
Inventor 罗永扬袁宗星袁自贞许占良
Owner 新乡市长城铸钢有限公司
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