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Method for detecting net type carbide of bearing semi-finished product by annealing corroding method

A reticulated carbide, corrosion method technology, applied in the direction of weather resistance/light resistance/corrosion resistance, analysis by chemical reaction of materials, measurement devices, etc. Production progress and other issues, to achieve the effect of saving inspection time and cycle, saving energy, and judging the level accurately

Active Publication Date: 2008-02-13
WAFANGDIAN BEARING GRP CO LTD
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  • Application Information

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Problems solved by technology

This method wastes a lot of energy and affects the production progress. The inspection of semi-finished annealed carbides in the bearing industry mainly relies on the central chemical laboratory. Every day, 3-10 samples need to be tested from time to time, so it is necessary to open the electric furnace for quenching every day. , wasting a lot of electric energy and manpower, and each inspection cycle takes about 4 hours, which affects normal production and process adjustment

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Embodiment Construction

[0011] The components and ratio of alkaline sodium picrate solution: 5 grams of picric acid, which acts as an oxidant; 25 grams of sodium hydroxide, which acts as an oxidizer; and 100 ml of water acts as a dilution.

[0012] Specific operation process: After polishing the sample, put it in alkaline sodium picrate solution and boil it for 15 minutes, take it out, rinse it with clean water, blow dry and observe with a 500x microscope, the network carbide is black, clear and easy to see. Find out the most serious field of view, and compare and rank according to JB1255-2001 standard.

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Abstract

The process of detecting net carbide in bearing steel in the annealing process includes the steps of: polishing the sample, boiling in alkali sodium picrate solution for 12-18 min, flushing with clear water, blowing to dry, observing in microscope the clear black net carbide, and finding out the serious part for comparison and grading. Where, the alkali sodium picrate solution consists of picric acid, sodium hydroxide and water in the weight ratio of 1 to 5 to 20.

Description

Technical field [0001] The invention relates to a method for inspecting bearing steel mesh carbides during a heat treatment and annealing process, in particular to a method for inspecting mesh carbides of semi-finished bearing steels by annealing corrosion method. Background technique [0002] At present, the reticulated carbides of bearing parts after annealing in the bearing industry are subjected to 4% nitric acid alcohol solution corrosion after heating and quenching to inspect the reticulated carbides. In this method, the bearing parts must be heated and quenched, and the bearing parts are waiting for the inspection results in the annealing furnace. Only qualified, can be processed in large quantities. This method wastes a lot of energy and affects the production schedule. The semi-finished annealing network carbide inspection in the bearing industry mainly relies on the Central Psychological Laboratory. Every day there are 3-10 samples that need to be tested from time to ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/75G01N17/00
Inventor 姚艳书曲荣君王仕军刘兆红康凯
Owner WAFANGDIAN BEARING GRP CO LTD
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