Development of Heat Treatment Process of 15NiMoSiCr10 Needle Valve Body for Medium Speed Marine
The needle valve assembly is an important part of the marine diesel engine and plays a key role in the safety and reliability of ship navigation.By utilizing low-pressure pulse vacuum carburizing and high-pressure gas quenching technology,successfully developed the heat treatment process of the 15NiMoSiCr10 marine needle valve body in China,and the heat treatment performance characteristics were systematically studied.The carburizing temperature was 960 ℃,and the carburizing time and acetylene pulse were simulated by VC-Sim 1.4.1 expert software to reduce the cost of process development.After carburizing at 960 ℃,the sample was directly quenched with 18 bar high-pressure nitrogen quenching,and cold treatment at-120 ℃ for 2 h,tempering resistance tests were conducted at different temperatures.The test results showed that the 15NiMoSiCr10 needle valve body had good processability,such as good tem-pering resistance,excellent metallographic structure and high core hardness,etc.It had a service life of more than 6 000 h,which was significantly extended service life compared with other materials needle valve body,effectively improving the market competitiveness of the product and bringing great economic benefits.
low-pressure pulse vacuum carburizinghigh pressure gas quenchingheat treatment process15NiMoSiCr10needle valve body
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