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35crmnsi steel heat treatment method to eliminate the second type of temper brittleness and improve toughness and 35crmnsi steel

A heat treatment method and temper brittleness technology, which is applied in the field of 35CrMnSi steel, can solve the problems of sharp drop in impact toughness, product quality decline, and increased production costs, and achieve the effects of eliminating temper brittleness, improving quality, and facilitating implementation

Active Publication Date: 2016-03-30
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Problems solved by technology

The tempering temperature is in the second type temper brittleness zone of 35CrMnSi steel material, so the impact toughness of 35CrMnSi steel material will drop sharply, and once the second type temper brittleness is formed, it is difficult to eliminate, resulting in product quality Decline, unqualified, limit the application of this steel type, waste production materials, increase the production cost of the enterprise

Method used

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  • 35crmnsi steel heat treatment method to eliminate the second type of temper brittleness and improve toughness and 35crmnsi steel

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Embodiment 1

[0026] A kind of heat treatment method that 35CrMnSi steel eliminates the second type of temper brittleness and improves toughness, it comprises the steps:

[0027] Step 1, quenching: quenching the 35CrMnSi steel;

[0028] Step 2, Tempering: Temper the 35CrMnSi steel quenched in Step 1 in the temperature range of 450-650°C. The tempering time is calculated according to the effective cross-section of the forging for every 100 mm of heat preservation for 2 hours, and the time is extended by half. At the same time The total number shall not be less than 4 hours; the specific calculation formula is: t=D / 100×2×2, where t is the tempering time in hours, and D is the effective section of the forging in millimeters;

[0029] Step 3, heating and heat preservation: transfer the 35CrMnSi steel obtained by tempering in step 3 to a heating environment of 650-700°C for heat preservation until the forging uniformly reaches the heating temperature, and the time required for the forging to uni...

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Abstract

The invention relates to the technical field of heat treatment of castings and forgings, in particular to 35CrMnSi steel, and a heat treatment method for eliminating second-class temper brittleness and improving toughness of the 35CrMnSi steel, which is suitable for quenching and tempering. The heat treatment method comprises a series of steps of quenching, tempering, heating, preserving heat and cooling, and integrates physical and chemical treatment technologies and the like, so that insufficient and incomplete basic structural transformation of the 35CrMnSi steel is avoided, the second-class temper brittleness is eliminated, and the toughness of a product is improved; the heat treatment method has the advantages as follows: by the heat treatment method, the quality of the product can be improved, the defective rate can be reduced, production resources can be saved, the production cost of an enterprise can be reduced, the second-class temper brittleness of the 35CrMnSi steel can be eliminated and the toughness of the 35CrMnSi steel can be improved.

Description

technical field [0001] The invention relates to the technical field of casting and forging heat treatment, in particular to a heat treatment method for eliminating the second type of temper brittleness and improving toughness of 35CrMnSi steel suitable for quenching and tempering treatment and improving toughness, and 35CrMnSi steel . Background technique [0002] In actual production, for castings and forgings of 35CrMnSi steel, there are often higher requirements for impact toughness. However, in the existing production process, the general quenching and tempering process for casting and forging of 35CrMnSi steel requires tempering at 450-650°C. The tempering temperature is in the second type temper brittleness zone of 35CrMnSi steel material, so the impact toughness of 35CrMnSi steel material will drop sharply, and once the second type temper brittleness is formed, it is difficult to eliminate, resulting in product quality Decline, unqualified, limit the application of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D1/25
Inventor 刘世晓王立新张建高全德
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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