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Test method for simulating oxidation and decarbonization of steel

A test method, a technology for simulating steel, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of high test cost and complicated operation, achieve the effect of enriching research methods, simple test methods, and broadening the scope of application

Inactive Publication Date: 2013-04-17
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of complex experimental operation and high test cost of traditional methods

Method used

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  • Test method for simulating oxidation and decarbonization of steel
  • Test method for simulating oxidation and decarbonization of steel
  • Test method for simulating oxidation and decarbonization of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention heats 55SiCrV spring steel to 850℃, 2% O 2 It is applied in the oxidation decarburization simulation test of different time insulation under the atmosphere, the specific steps are:

[0022] a. Use wire cutting to prepare samples of the same specifications with a diameter of 4.5mm and a height of 6mm;

[0023] b. After rough grinding and fine grinding, the surface of the sample is ultrasonically cleaned. The cleaning agent is 90% ethanol solution;

[0024] c. Place the prepared sample in a dynamic thermogravimetric analyzer with multiple gas paths, first perform 3 vacuuming operations, and then set the test program as follows: under the protection of Ar gas, heat up to 850°C at 40°C / min. , And at 850℃, 2%O 2 Incubate for 10, 20, and 30 minutes in the atmosphere, and then quickly drop to room temperature at 40°C / min under the protection of Ar atmosphere. The total gas flow rate remains unchanged during the entire experiment.

[0025] d. Through the automat...

Embodiment 2

[0028] The invention is based on 55SiCr spring steel 2%O 2 It is applied in the oxidative decarburization simulation test of heating to 950, 1050, and 1150℃ for 30 minutes under the atmosphere. The specific steps are:

[0029] a. Use wire cutting to prepare samples of the same specifications with a diameter of 4.5mm and a height of 6mm;

[0030] b. After rough grinding and fine grinding, the surface of the sample is ultrasonically cleaned. The cleaning agent is 90% ethanol solution;

[0031] c. Place the prepared sample in a dynamic thermogravimetric analyzer with multiple gas paths and perform 4 vacuuming operations, and then set the test program as follows: under the protection of Ar gas, it is heated to 950 at 40℃ / min. 1050, 1150℃, and in 2%O 2 In the atmosphere, the temperature is kept for 30 minutes, and then it is rapidly reduced to room temperature at 40°C / min under the protection of Ar atmosphere. The total gas flow rate remains unchanged during the entire experiment.

[003...

Embodiment 3

[0035] In the present invention, 55SiCr spring steel is heated to 850℃, and the temperature is 2%, 6%, and 10% O 2 It was applied in the oxidative decarburization simulation test which was kept at each temperature for 30 minutes. The specific steps are:

[0036] a. Use wire cutting to prepare samples of the same specifications with a diameter of 4.5mm and a height of 6mm;

[0037] b. After rough grinding and fine grinding, the surface of the sample is ultrasonically cleaned. The cleaning agent is 90% ethanol solution;

[0038] c. Place the prepared sample in a dynamic thermogravimetric analyzer with multiple gas paths and perform 5 vacuuming operations, and then set the test program as follows: under the protection of Ar gas, the temperature is increased rapidly at 40℃ / min and heated to 850℃ , Respectively in 2%, 6%, 10%O 2 In the atmosphere, the temperature is kept for 30 minutes, and then it is quickly reduced to room temperature at 40°C / min under the protection of Ar atmosphere....

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Abstract

The invention discloses a test method for simulating oxidation and decarbonization of steel, and belongs to the technical field of steel and iron material surface quality inspection. The test method comprises the steps that a sample for simulating the oxidation and decarbonization is prepared by linear cutting; the sample is subjected to grinding, polishing, and ultrasonic cleaning treatment, and then placed into a dynamic thermogravimetric analyzer comprising a plurality of gas circuits; steel sample heating, heat preservation and cooling are achieved; thermogravimetric curves of different holding times, different heating temperatures and different gas atmospheres and the sample for simulating the oxidation and decarbonization are obtained; the depth of decarburization of the steel is determined and analyzed according to GB / T 224-2008 Determination of Depth of Decarburization of Steels by metallography; and surface decarburization of the steel is obtained. The test method has the advantages that the test method is simple, quick and effective, and enriches steel oxidation and decarbonization research methods.

Description

Technical field [0001] The invention belongs to the technical field of surface quality inspection of steel materials. In particular, it relates to a test method for simulating oxidative decarburization of steel. It is mainly used to study the test method of oxidative decarburization of steel using a dynamic thermogravimetric analyzer with multiple gas paths. It is applied to the decarburization control of spring steel, steel cord and other wire rods, which can provide important guidance for the surface quality control of steel. data. Background technique [0002] Decarburization is one of the common problems in the hot working process of steel materials. Decarburization refers to the phenomenon that carbon atoms on the surface of steel diffuse under high temperature conditions and migrate to the surface to chemically react with oxygen in the heating furnace, resulting in the loss of carbon atoms within a certain range of the surface of steel. The decarburization process includ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D3/04C21D11/00
Inventor 史学星鞠新华刘卫平蔡宁佟倩张玮
Owner SHOUGANG CORPORATION
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