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Heat treatment method of alloy steel 40Cr sample

A heat treatment method and alloy steel technology, applied in the field of heat treatment, can solve the problems of unqualified mechanical properties and increase production costs, and achieve the effects of reducing scrap rate and production cost, and improving elongation and section shrinkage.

Pending Publication Date: 2021-03-12
XINXING DUCTILE IRON PIPES CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when conventional heat treatment is used for quenching and tempering, there will be products with unqualified mechanical properties, and the unqualified rate is as high as 40%, which greatly increases the production cost

Method used

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  • Heat treatment method of alloy steel 40Cr sample
  • Heat treatment method of alloy steel 40Cr sample

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Experimental program
Comparison scheme
Effect test

Embodiment

[0019] Heat the sample according to the following steps:

[0020] A. Quenching treatment: Process the alloy steel 40Cr into a sample blank with a diameter of 25mm, put it into a muffle furnace and heat it to 900°C for quenching, put 4 pieces each time, keep it warm for 130-150min, and cool it with a cooling medium for 10min. The cooling medium is a mixture of quenching liquid and water, and the volume ratio of quenching liquid and water is 1:10, and the quenching liquid is 2#PAG quenching liquid;

[0021] B. Tempering treatment: Then heat the sample blank to 470°C for tempering, keep it warm for 80 minutes, use a cooling medium to cool it to 70-80°C, then take it out and naturally cool it to room temperature. The cooling medium is a mixture of sesame oil and vegetable oil, and The volume ratio of sesame oil to vegetable oil is 4:1.

[0022] The mechanical properties of the 7 batches of sample blanks after the above heat treatment were tested:

[0023] Process the sample blan...

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Abstract

The invention discloses a heat treatment method of an alloy steel 40Cr sample, which comprises the following steps of A, quenching treatment: putting the alloy steel 40Cr sample into a muffle furnace,heating to 900 DEG C, quenching, keeping the temperature for 130-150 minutes, cooling for 10 minutes by using a cooling medium, controlling the diameter of the sample to be 25mm, and filling four samples into the muffle furnace during each quenching treatment; and B, tempering treatment: specifically, heating the samples to 470 DEG C to be tempered, keeping the temperature for 80 min, cooling thesamples to 70-80 DEG C through the cooling medium, and then taking out the samples and naturally cooling to the room temperature. The mechanical property indexes of the samples obtained through the heat treatment method all meet the standard requirements.

Description

technical field [0001] The invention relates to a heat treatment method for an alloy steel 40Cr sample, belonging to the technical field of heat treatment. Background technique [0002] 40Cr steel is one of the most widely used steels in the machinery manufacturing industry. It belongs to medium carbon alloy quenched and tempered steel, cold heading die steel, and will have good comprehensive mechanical properties after quenched and tempered. Quenching and tempering is carried out according to the heat treatment recommended in the standard GB / T 3077-2015, but the standard only recommends that the quenching temperature is (850±15)°C, the coolant is oil, the tempering temperature is (520±50)°C, the coolant It is water or oil, and the oil is No. 20 engine oil. However, the specific holding time, cooling medium, and cooling time are not mentioned. The holding time, cooling medium, and cooling time can only be judged based on experience. However, in actual production, waste part...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D6/00
CPCC21D1/18C21D6/002
Inventor 张振东杨冉冉
Owner XINXING DUCTILE IRON PIPES CO LTD
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