What is the difference between SUS303 and SUS304 in the CNC turning process?

SUS 303 and SUS 304 are both stainless steel alloys commonly used in CNC turning processes. While they share many similarities, there are a few notable differences:

1. Chemical Composition: SUS 303 is an austenitic stainless steel alloy with added sulfur and selenium, which improves its machinability. On the other hand, SUS 304 is also an austenitic stainless steel alloy but does not contain sulfur and selenium.

2. Machinability: Due to the sulfur and selenium additives, SUS 303 has better machinability compared to SUS 304. The presence of these elements makes SUS 303 easier to cut and machine, resulting in shorter machining times and improved tool life.

3. Corrosion Resistance: SUS 304 offers better corrosion resistance than SUS 303. It is highly resistant to corrosion from chemicals, acids, and atmospheric conditions, making it suitable for applications in harsh environments. SUS 303’s corrosion resistance is lower, especially in environments containing chlorides.

4. Applications: SUS 303 is often preferred for machining applications where excellent machinability is crucial, such as in the production of nuts, bolts, screws, and shafts. SUS 304 is more commonly used in applications requiring superior corrosion resistance, such as in the manufacturing of kitchen equipment, architectural structures, and chemical processing equipment.

Overall, the choice between SUS 303 and SUS 304 in CNC turning processes depends on the specific requirements of the application. SUS 303 is favored for its machinability, while SUS 304 is preferred for its corrosion resistance properties.

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