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Method for detecting austenite grain size of high-carbon chromium bearing steel

A technology of high carbon chromium bearing steel and high carbon chromium bearing, which is applied in particle size analysis, measuring device, particle and sedimentation analysis, etc., can solve the problems of poor display effect and large difference, and achieve better detection and evaluation results and simple operation. , the objective effect of testing and evaluation results

Pending Publication Date: 2021-03-26
DAYE SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for detecting the austenite grain size of high-carbon chromium bearing steel, so as to solve the problem that the current high-carbon chromium bearing steel austenite grain size detection is different from the actual use state, and the display effect is not good. good question

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  • Method for detecting austenite grain size of high-carbon chromium bearing steel
  • Method for detecting austenite grain size of high-carbon chromium bearing steel
  • Method for detecting austenite grain size of high-carbon chromium bearing steel

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Embodiment 1

[0054] This embodiment provides a method for detecting the austenite grain size of high-carbon chromium bearing steel. The main chemical components of high-carbon chromium bearing steel are: C 0.96%, Mn 0.39%, Si 0.26%, Cr 1.46%, Mo 0.02%, P 0.009%, S0.003%, and the rest are Fe and other unavoidable impurities.

[0055] Bearing Steel Steel Specifications Referring to the standard sampling requirements of GB / T6394-2017 "Measurement Method for Average Grain Size of Metal", a square grain size sample of 10mm×10mm was intercepted at half the radius of the steel.

[0056] Place the grain size sample in a quenching heating furnace for heating, the heating temperature is 840 ° C, and the holding time is 60 minutes. The sample after heat preservation is quickly placed in quenching oil for quenching; the quenched grain size sample is placed in the Temper in the furnace, the tempering temperature is controlled at 150°C, the holding time is 2h, and then air-cooled.

[0057] After the ...

Embodiment 2

[0059] A method for detecting the austenite grain size of high-carbon chromium bearing steel provided in this embodiment, the main chemical composition of high-carbon chromium bearing steel is: C 0.97%, Mn 1.08%, Si 0.55%, Cr 1.48%, Mo0 .01%, P 0.010%, S0.004%, and the rest are Fe and other unavoidable impurities.

[0060] Bearing Steel Steel Specifications Referring to the standard sampling requirements of GB / T6394-2017 "Measurement Method for Average Grain Size of Metal", a square grain size sample of 10mm×10mm was intercepted at half the radius of the steel.

[0061] Place the grain size sample in a quenching heating furnace for heating, the heating temperature is 850°C, and the holding time is 80min. The sample after heat preservation is quickly placed in quenching oil for quenching; the quenched grain size sample is placed in the Temper in the furnace, the tempering temperature is controlled at 160°C, the holding time is 90min, and then air-cooled.

[0062] After the h...

Embodiment 3

[0064] The detection method of austenite grain size of a high-carbon chromium bearing steel provided in this embodiment, the main chemical composition of the high-carbon chromium bearing steel is: C 0.96%, Mn 0.38%, Si 0.28%, Cr 1.47%, Mo0 .20%, P 0.011%, S0.003%, and the rest are Fe and other unavoidable impurities.

[0065] Bearing Steel Steel Specifications Referring to the standard sampling requirements of GB / T6394-2017 "Measurement Method for Average Grain Size of Metal", a square grain size sample of 10mm×10mm was intercepted at half the radius of the steel.

[0066] Place the grain size sample in a quenching heating furnace for heating, the heating temperature is 845 ° C, and the holding time is 70 minutes. The sample after heat preservation is quickly quenched in quenching oil; the quenched grain size sample is placed in the Temper in the furnace, the tempering temperature is controlled at 180°C, the holding time is 80min, and then air-cooled.

[0067] Grind, sand, ...

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Abstract

The invention provides a method for detecting austenite grain size of high-carbon chromium bearing steel. The detection method comprises the following steps: 1, a grain size sample is cut from the high-carbon chromium bearing steel; 2, the cut grain size sample is placed in a quenching heating furnace to be heated and subjected to heat preservation, then the sample subjected to heat preservation is placed in a quenching medium to be quenched, and a quenched sample is obtained; 3, the quenched sample is placed in a tempering furnace for tempering treatment, then air cooling is conducted, and aheat-treated sample is obtained; and 4, a metallographic specimen is manufactured according to the specimen subjected to heat treatment, the metallographic specimen is corroded by adopting a corrosiveagent, and observation is performed under a metallographic microscope to determine the austenite grain size grade of the high-carbon chromium bearing steel. According to the invention, the heat treatment process is set according to the use state, and a proper corrosive agent is adopted, so that the austenite grain boundary of the bearing steel can be clearly displayed, and grain grading is facilitated; and the evaluation result is more objective and real, and performance research and analysis of the bearing steel product are facilitated.

Description

technical field [0001] The invention belongs to the technical field of bearing steel material inspection, and in particular relates to a method for detecting the austenite grain size of high-carbon chromium bearing steel. Background technique [0002] The austenite grain size of steel has a great influence on mechanical properties, physical properties and chemical properties, so the evaluation of austenite grain size is very important for judging the quality of steel, checking the correctness of thermal processing technology, It is of great significance to study the influence of grain size on related properties. [0003] Bearing steel is mainly used to manufacture various rolling bearings, tools and wear-resistant parts. The main alloying elements in bearing steel are carbon and chromium. Carbide segregation is easy to form when molten steel solidifies, and it is difficult to eliminate it in the later heating and rolling process. The inhomogeneity of carbides in bearing st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32G01N1/42G01N1/44G01N15/02
CPCG01N1/28G01N1/32G01N1/42G01N1/44G01N15/0227
Inventor 徐尚呈周立新刘光辉李博鹏陈君刘月云田浩汪财翔
Owner DAYE SPECIAL STEEL CO LTD