It is necessary.

1. Stronger corrosion resistance: 316 stainless steel has a higher nickel content than 304 stainless steel, and molybdenum is added to make it more corrosion-resistant than 304 stainless steel.

2. Safer. Pressure cookers made of 316 material are generally better than pressure cookers made of 304 material in terms of safety.

3. Long service life. The pressure cooker made of 316 material may be more durable and have a longer service life.