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A kind of overall quenching and tempering heat treatment method for h13 round steel

A quenching and tempering heat treatment and annealing heat treatment technology, applied in the field of heat treatment, can solve the problems of serious environmental pollution, product scrapping, and fire hazards, and achieve excellent comprehensive performance, reduce processing costs, and avoid pollution and fire hazards.

Active Publication Date: 2022-07-29
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) Oil is used as the cooling medium, which not only pollutes the environment seriously, but also poses a fire hazard
[0008] However, some documents use water as the cooling medium of H13 steel, but due to the good hardenability of H13 steel material, large stress and deformation are generated during the quenching process, which makes H13 steel easy to crack, and eventually leads to product scrap
In addition, there is no precedent for the overall heat treatment of H13 to be delivered to users

Method used

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  • A kind of overall quenching and tempering heat treatment method for h13 round steel
  • A kind of overall quenching and tempering heat treatment method for h13 round steel

Examples

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Comparison scheme
Effect test

Embodiment 1

[0062] In this example, the overall quenching and tempering heat treatment is performed on H13 round steel with a specification of Φ45mm, and the hardness range after heat treatment is required by the user to be 27-35HRC. The H13 round steel is obtained by rolling and forming, and the overall quenching and tempering heat treatment method is as follows:

[0063] Quenching and tempering method: induction coil austenitizing temperature 1010℃, quenching water cooling; tempering 670℃, holding time 2h; specific steps are as follows:

[0064] (1) Annealing heat treatment: according to the heat treatment method of H13 section steel in CN201310548794.0, the rolled H13 round steel is subjected to annealing heat treatment;

[0065] (2) Surface finishing: To finish the surface of H13 round steel after annealing and heat treatment, fine cracks can be removed by peeling with grinding wheel, turning and grinding, etc., to prevent quenching cracking caused by unremoved surface defects.

[00...

Embodiment 2

[0070] In this example, the overall quenching and tempering heat treatment is performed on H13 round steel with a specification of Φ60mm, and the hardness range after heat treatment is required by the user to be 27-35HRC. The H13 round steel is obtained by rolling and forming, and the overall quenching and tempering heat treatment method is as follows:

[0071] Quenching and tempering method: induction coil austenitization temperature 1010 ℃, quenching water cooling; tempering 670 ℃, holding time 3h; specific steps are as follows:

[0072] (1) Annealing heat treatment: according to the heat treatment method of H13 section steel in CN201310548794.0, the rolled H13 round steel is subjected to annealing heat treatment;

[0073] (2) Surface finishing: To finish the surface of H13 round steel after annealing and heat treatment, fine cracks can be removed by peeling with grinding wheel, turning and grinding, etc., to prevent quenching cracking caused by unremoved surface defects.

...

Embodiment 3

[0079] In this example, the overall quenching and tempering heat treatment is performed on H13 round steel with a specification of Φ120mm, and the hardness range after heat treatment is required by the user to be 50-56HRC. The H13 round steel is obtained by rolling and forming, and the overall quenching and tempering heat treatment method is as follows:

[0080] Quenching and tempering method: continuous furnace austenitization temperature 1010 ℃, holding time 2h, quenching water cooling; tempering at 540 ℃, holding time 4h. Specific steps are as follows:

[0081] (1) Annealing heat treatment, according to the heat treatment method of H13 section steel in CN201310548794.0, the rolled H13 round steel is subjected to annealing heat treatment;

[0082] (2) Surface finishing: To finish the surface of H13 round steel after annealing and heat treatment, fine cracks can be removed by peeling with grinding wheel, turning and grinding, etc., to prevent quenching cracking caused by unr...

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Abstract

The invention discloses an overall quenching and tempering heat treatment method for H13 round steel. Then, the austenitized H13 round steel is cooled by using water as the cooling medium; the austenitizing temperature is designed to be 950-1030°C, and the holding time is 1h / 100mm-4h / 100mm; ≤60mm round steel, use induction coil heating for quenching; for 60mm <Φ≤150mm round steel, use trolley furnace or continuous furnace for quenching. The invention adopts the overall quenching and tempering treatment of H13 steel and cooling medium water, and obtains excellent comprehensive performance, and the phenomenon of H13 steel cracking and scrapping does not occur; at the same time, the excessive bending of small-sized round steel due to the rapid release of quenching stress is prevented, and the processing of user parts is reduced. cost, avoid pollution and fire hazards.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to an overall quenching and tempering heat treatment method for H13 round steel. Background technique [0002] H13 is C-Cr-Mo-Si-V steel, which is extremely common in the hot work die steel market. The content of H13 alloy elements is high, and the hardenability is good. It is easy to generate large stress and deformation during the quenching process, which leads to cracks. [0003] In order to reduce the risk of cracking and heat treatment tooling conditions, heat treatment of parts is a conventional production method currently used in processing plants. The overall heat treatment of steel is the heat treatment of the entire steel rod. Compared with the heat treatment of parts, the overall heat treatment of steel bars mainly requires two aspects of production conditions: 1. The finishing heat treatment has higher control requirements for the quenching link; 2. Larger heat treatment tool...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D1/10C21D1/32C21D6/00C22C38/24C22C38/22C22C38/04C22C38/02
CPCC21D1/18C21D1/10C21D1/32C21D6/002C21D6/008C21D6/005C22C38/24C22C38/22C22C38/04C22C38/02C21D2261/00Y02P10/25
Inventor 张永强雷应华杨煌光李造宇周许邓力
Owner DAYE SPECIAL STEEL CO LTD
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