SUS 201: We also call it high Manganese Steel, for it has high Mn content, easy to rust; less nickel, corrosion resistance is not as good as 304. In the market, some unscrupulous merchants use 201 as 304 to deceive consumers in order to save costs.
SUS 304: Also called 18/8 stainless steel, the content is about 18% chromium + 8% nickel, and the anti-corrosion and rust resistance is better than that of 201. It is currently the most widely used stainless steel material.
SUS 316: Also called 18/10 stainless steel, the content is about 18% chromium + 10% nickel, the price is relatively expensive, and the corrosion resistance is very good. SS 316 is usually used in some high-end equipment, such as aerospace, food machinery, high-end kitchenware and other fields.
(PS: We can distinguish the material by detecting the potion.)