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Heat treatment process of alloy steel

A technology of alloy steel and process, which is applied in the field of alloy steel heat treatment process, can solve problems such as cracks in the riser area of ​​castings, customer influence, cracks, etc., to achieve the effects of quality assurance, simple process, and improved organizational structure

Inactive Publication Date: 2019-06-11
YANCHENG AOTONG TESCO FOUNDRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For alloy steel or low alloy steel castings, during the final inspection or processing of the product, more or less cracks are found in the riser area of ​​the casting, and some cracks appear even after the pressure test, and some cracks appear on the pipeline. The discovery of cracks not only caused bad influence to customers, but also caused certain losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The alloy steel heat treatment process includes the following steps:

[0022] S1. Normalizing: the alloy steel with the riser is put into the normalizing furnace for normalizing treatment. The specific process is: put it in the normalizing furnace, heat up to 800-900 degrees Celsius, keep it warm for 3-4 hours, and then air cool to room temperature;

[0023] S2, annealing: the alloy steel with the riser enters the annealing furnace for annealing treatment, the specific process is: put it in the annealing furnace, heat up to 650-750 degrees Celsius, keep it warm for 5-7 hours, cool it to 200-350 degrees Celsius with the furnace, take it out, and then Immediate riser cutting;

[0024] S3, quenching: put the alloy steel obtained in step S2 after cutting the riser into the quenching furnace for quenching treatment, the specific process is: put it in the quenching furnace, heat up to 700-850 degrees Celsius, keep it warm for 3-4 hours, and take it out of the furnace water c...

Embodiment 2

[0027] The alloy steel heat treatment process includes the following steps:

[0028] S1. Normalizing: the alloy steel with the riser is put into the normalizing furnace for normalizing treatment. The specific process is: put it in the normalizing furnace, heat up to 850 degrees Celsius, keep it warm for 3.5 hours, and then air cool to room temperature;

[0029] S2. Annealing: the alloy steel with the riser is put into the annealing furnace for annealing treatment. The specific process is: put it in the annealing furnace, raise the temperature to 700 degrees Celsius, keep it warm for 6 hours, take it out after cooling to 300 degrees Celsius with the furnace, and then immediately cut the riser;

[0030] S3, quenching: put the alloy steel obtained in step S2 after cutting the riser into a quenching furnace for quenching treatment, the specific process is: put it in the quenching furnace, heat up to 700 degrees Celsius, keep it warm for 4 hours, and cool it to room temperature afte...

Embodiment 3

[0033] The alloy steel heat treatment process includes the following steps:

[0034] S1. Normalizing: the alloy steel with the riser is put into the normalizing furnace for normalizing treatment. The specific process is: put it in the normalizing furnace, heat up to 800-900 degrees Celsius, keep it warm for 3-4 hours, and then air cool to room temperature;

[0035] S2, annealing: the alloy steel with the riser enters the annealing furnace for annealing treatment, the specific process is: put it in the annealing furnace, heat up to 650-750 degrees Celsius, keep it warm for 5-7 hours, cool it to 200-350 degrees Celsius with the furnace, take it out, and then Immediate riser cutting;

[0036] S3, low-temperature tempering: put the alloy steel after cutting the riser obtained in step S2 into the tempering furnace, raise the temperature to 350-400°C, keep it warm for 2-3h, and air-cool to room temperature after the riser is cut; , will also produce stress, which can be removed by ...

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Abstract

The invention provides a heat treatment process of alloy steel, and particularly relates to the technical field of alloy steel production. The heat treatment process comprises the following steps that: S1, normalizing is conducted, specifically, the alloy steel with riser enters a normalizing furnace to be normalized; S2, annealing is conducted, specifically, the alloy steel with riser enters an annealing furnace to be annealed, and when being cooled to 200-350 DEG C, the alloy steel is taken out from the annealing furnace, and the riser is cut immediately; S3, quenching is conducted, specifically, the alloy steel with the riser cut obtained in the step 2 is put in a quenching furnace to be quenched; and S4, tempering is conducted, specifically, the quenched alloy steel is put in a tempering furnace to be tempered. According to the heat treatment process of the alloy steel, the step of riser cutting is put into the heat treatment process, specifically, the riser is cut after normalizing and annealing; according to the steps of normalizing and annealing, crystalline grains in a product are fined, the organization structure is improved, stress can be further removed, and the riser iscut after the stress is removed, so that the alloy steel product does not crack any more, and the quality of the product is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of alloy steel production, and in particular relates to an alloy steel heat treatment process. Background technique [0002] For alloy steel or low alloy steel castings, during the final inspection or processing of the product, more or less cracks are found in the riser area of ​​the casting, and some cracks appear even after the pressure test, and some cracks appear on the pipeline. The discovery of cracks not only has a bad influence on customers, but also causes certain losses. [0003] Therefore be badly in need of a kind of alloy steel heat treatment process that can solve existing problems. Contents of the invention [0004] The purpose of the present invention is to provide a heat treatment process for alloy steel. The cutting riser is placed in the heat treatment process, specifically in the process of normalizing and annealing, after the stress is removed, the riser is cut, so that the alloy stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/18C21D1/26C21D1/28
Inventor 吴卫明
Owner YANCHENG AOTONG TESCO FOUNDRY CO LTD
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