Title:
MEDIUM-TEMPERATURE GAS NITROCARBURIZING QUENCHING PROCESS
Document Type and Number:
WIPO Patent Application WO/2019/223078
Kind Code:
A1
Abstract:
The present invention provides a medium-temperature gas nitrocarburizing quenching process, comprising: placing a formed crankshaft in a fluidized bed particle furnace to be heated to 600-800°C, and performing austenitizing; introducing argon into the furnace, and performing a carburizing treatment on an austenitic stainless steel workpiece to form a carburized layer under the protection of argon, a carburizing time duration being 20-160 min; continuing introducing argon, and performing a nitriding treatment on the austenitic stainless steel workpiece to form a nitrided layer under the protection of argon, a nitriding time duration being 40-160 min; and then performing isothermal quenching in the fluidized bed particle furnace at 250-360°C. According to the method, the carburizing treatment and the nitriding treatment are performed alternately under the condition of introducing argon continuously, the causes for producing hydrocyanic acid can be eliminated, and the hardness and the corrosion resistance of the workpiece are improved by means of a nitrocarburized layer formed by compounding alternately. Moreover, the process is fast in treatment speed and simple in process, and is suitable for large-scale popularization and use.
Inventors:
YIN WENYUAN (CN)
QIAN XIANGXIN (CN)
QIAN XIANGXIN (CN)
Application Number:
PCT/CN2018/095301
Publication Date:
November 28, 2019
Filing Date:
July 11, 2018
Export Citation:
Assignee:
JIANGSU WANLI MACHINERY CO LTD (CN)
International Classes:
C23C8/32; C21D1/18; C21D9/30
Domestic Patent References:
| WO2017216500A1 | 2017-12-21 |
Foreign References:
| CN1424425A | 2003-06-18 | |||
| CN101187027A | 2008-05-28 | |||
| JPH07233411A | 1995-09-05 |
Attorney, Agent or Firm:
NANJING RUI ZHI BO IP AGENCY CO., LTD. (CN)
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