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Salt Bath Nitriding Treatment of the Crankshaft of WD615 Series Engine

Guo Shuqin etc.  
This paper introduces the new technology of salt bath soft nitriding treatment developed on the imported salt bath nitriding production line of the Styr engine crankshaft .In this process ,the length of time of treatment is short ,the temperature of treatment low and the deformation small.The surface hardness of the crankshaft thus treated will reach HV10≥300,the nitrided depth 0.8~1.0 mm,and a compound layer depth 0.02~0.025 mm,thus will remarkably increase the fatigue strength ,the anti-abrasive property as well as the anti-seizing property of the crankshaft .Moreover ,the bending deformation formed during treatment of the nitrided crankshaft can be easily straightened out by pressure pressing and as a result ,can meet well the requirement of the strenghtening technic of crankshaft.
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