| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring method and a device capable of determining a hydrogen concentration in a molten metal quickly and simply. SOLUTION: A lidded sealed container 2 for storing a sampling container 1 of the molten metal M is connected to a depressurized container 3 depressurized by a vacuum pump 5 through a communicating path 4, and the sampling container 1 is put into the sealed container 2, and then an on-off valve 8A in the communicating path 4 is opened, to thereby depressurize quickly the inside of the sealed container 2. Then, discharge of hydrogen gas is generated from the molten metal M in the sampling container 1, and molten metal splash M' is scattered upward from the surface of the molten metal M accompanied thereby. A pressure sensor 11 is arranged on the back of an opening/closing lid 2a of the sealed container 2, and the pressure sensor 11 outputs a signal in response to collision with the molten metal splash M', and a scattering amount of the molten metal splash M' can be known from the output signals. Consequently, it can be specified that the hydrogen concentration in the molten metal is within an acceptable level when a generation amount of the molten metal splash M' from the molten metal M which is a measuring object is lower than a threshold, by acquiring beforehand the generation amount of the molten metal splash relative to a high-quality molten metal and by setting the threshold properly. COPYRIGHT: (C)2008,JPO&INPIT
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