Austenitic stainless steel, and method for removing hydrogen therefrom
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experimental example 1
ADDITIONAL EXPERIMENTAL EXAMPLE 1
[0116]The experiment was performed on a thermally-treated test piece of SUS316. The test piece was a round bar 7 mm in diameter. For TDS measurement, a disc 7 mm in diameter and 0.8 mm thick was cut from the round bar. In the experiment the test piece was thermally-treated at 800° C. for 20 minutes. The atmospheres during the experiment were an air atmosphere, a vacuum environment (approximately 0.006 Pa), and an Ar gas atmosphere. The thermal treatment was performed while supplying Ar gas thereto. The heating rate was 0.5° C. / second up to 700° C. The escaped hydrogen was measured for heating up to 700° C.
[0117]The measurements were performed using a thermal desorption spectrometer (EMD-WA1000S / H) manufactured by ESCO, Ltd. (Musashino city, Tokyo, Japan). FIG. 12 shows the measurement results. In the graph, the horizontal axis represents the measurement temperature, and the vertical axis represents the hydrogen release intensity. The hydrogen concent...
experimental example 2
ADDITIONAL EXPERIMENTAL EXAMPLE 2
[0118]The experiment was performed on a thermally-treated test piece of SUH660. The test piece was a round bar 7 mm in diameter. For TDS measurement, a disc 7 mm in diameter and 0.8 mm thick was cut from the round bar. For the experiment, the test piece was thermally-treated at 720° C. for 16 hours. The experimental atmosphere was an air atmosphere and a vacuum environment (approximately 0.006 Pa). The hydrogen concentration of the test piece before the aging treatment was 1.3 wt ppm. The hydrogen concentration of the test piece after the aging treatment was 0.6 wt ppm.
[0119]In this manner, hydrogen content in the stainless steel could be removed by performing an aging treatment and the like during the manufacturing process of stainless steel. The heating rate for the TDS measurement was 0.33° C. / second up to 700° C. The escaped hydrogen was measured for heating up to 600° C. The measurements were performed using a thermal desorption spectrometer (EM...
experimental example 3
ADDITIONAL EXPERIMENTAL EXAMPLE 3
[0120]The experiment was performed on thermally-treated test pieces of SUS304 and SUS316L. The test pieces were disc-shaped samples having a diameter of 7 mm and a thickness of 0.4 mm. The experiment atmosphere in this thermal treatment was an air atmosphere at approximately 0.1013 MPa. In the experiment, the test pieces were aged by being placed in an air atmosphere at a temperature of 300° C. and 450° C., where a thermal treatment was carried out for 2 hours.
[0121]For TDS measurement there was used a disc 7 mm in diameter and 0.4 mm thick after thermal treatment. The measurements were performed using a thermal desorption spectrometer (EMD-WA1000S / H) manufactured by ESCO, Ltd. (Musashino city, Tokyo, Japan). FIGS. 14A and 14B show the measurement results. In the graphs, the horizontal axis represents the measurement temperature, and the vertical axis represents the hydrogen release intensity. The heating rate for the TDS measurement was 0.5° C. / seco...
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