| Operation Steps：
1. Turn on the switch of argon gas bomb and adjust the pressure to 0.6Mpa; power on and switch on the screen.
2. Wait for the instrument preheat for 30 minutes, re-check if the equipment meet the test requirements.
3. Select the type of the stainless steel.
4. Test the equipment for standard testing according to the types.
5. Analysis the sample when the instrument working property, test at least three times for each sample, take the average.
6. Record the test result.