Austenitic stainless steel and process for hydrogen removal thereof
An austenitic stainless steel, austenitic technology, applied in the field of austenitic stainless steel, can solve problems such as martensitic transformation
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experiment example 1
[0122] A heat treatment experiment was performed using a test piece made of SUS316. The test piece was a round bar with a diameter of 7 mm. Cut into a disc shape with a diameter of 7mm and a thickness of 0.8mm for TDS measurement. In the experiment, the test piece was put into the test piece and heated for 20 minutes at a temperature of 800°C. The experimental environment at this time was the atmosphere, a vacuum environment (about 0.006 Pa) and an Ar gas environment. In the case of Ar gas, heat treatment is performed while supplying it. The temperature increase rate when heating to 700°C is 0.5°C per second. The released hydrogen was measured upon heating to 700°C.
[0123] The measurement was performed with a temperature-rising desorption analyzer EMD-WA1000S / H manufactured by Electronic Science Co., Ltd. (Location: Musashino City, Tokyo, Japan). The results of this measurement are as Figure 12 shown. The horizontal axis of the graph in the figure represents the meas...
experiment example 2
[0125] Heat treatment experiments were performed using test pieces made of SUH660. The test piece was a round bar with a diameter of 7 mm. Cut into a disc shape with a diameter of 7mm and a thickness of 0.8mm for TDS measurement. In the experiment, the test piece was put into the test piece for heat treatment for 16 hours at a temperature of 720° C., and the aging treatment was carried out. The experimental environment at this time is a vacuum environment (about 0.006 Pa). The hydrogen concentration of the test piece before the aging treatment was 1.3 ppm. After the aging treatment, the hydrogen concentration of the test piece became 0.6 ppm.
[0126] In this way, stainless steel is subjected to aging treatment or the like in its manufacturing process to remove hydrogen contained therein. The temperature rise rate when heated to 700°C is 0.33°C per second. Upon heating to 600°C, the hydrogen released was measured. The measurement was carried out with a temperature-rising...
experiment example 3
[0128] Heat treatment experiments were performed using test pieces made of SUS304 and SUS316L. The test piece was a disk-shaped sample with a diameter of 7 mm and a thickness of 0.4 mm. The experimental environment during this heat treatment was the environment in the air. The atmospheric environment is about 0.1013 MPa. In the experiment, the test piece was put into the air environment at a temperature of 300°C and 450°C for heat treatment for 2 hours to perform aging treatment.
[0129] The TDS measurement was carried out in a state of a disc shape with a diameter of 7 mm and a thickness of 0.4 mm after the heat treatment. The TDS measurement was performed with a temperature-rising desorption analyzer (EMD-WA1000S / H) manufactured by Electronic Science Co., Ltd. (Musashino-shi, Tokyo, Japan). The results of this measurement are as Figure 14 shown. The horizontal axis of the graph in the figure represents the measurement temperature, and the vertical axis represents the ...
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