Jiangsu Dongming Group Co.

Zalantun, China

Jiangsu Dongming Group Co.

Zalantun, China

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Sun B.,Jiangsu Dongming Group Co. | Wang H.,Changshu Dexinsheng Precision Machinery Co. | Zhou J.,Jiangsu Dongming Group Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Suspected cause of oxide film on the workpiece was verified by test. The results show that when the workpiece is in the front chamber before entering the oil-quenching tank, there's a short time about 2-3 s during the door closing, the air goes in the front chamber and reactes with hot workpieces, will produce oxide film. Adding nitrogen charging device and changing operating process can avoid the oxidation of workpiece.


Sun B.,Jiangsu Dongming Group Co. | Zhou J.,Jiangsu Dongming Group Co. | Wang H.,Changshu Dexinsheng Precision Machinery Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

20CrMnTi steel samples acid soaked and non-soaked were carburized and tempered. Gradient of carbon concentration and case depth in the samples were inspected. The results show that the surface carbon concentration and case depth of the acid soaked samples are higher than that of the non-acid soaked samples for the same heat treatment process. That is because of many corrosion pits existed in surface of the acid soaked samples; by which the contacting area in the carburizing atmosphere can be increased at the beginning of the carburizing process, compared to non-soaked samples, the more carbon atom diffuse into surface of the acid soaked samples, and the high gradient of carbon concentration between surface and core is formed.

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