What is the difference between stainless steel raw materials 301 and 304?

What is the difference between stainless steel raw materials 301 and 304?

301 is 4% nickel content, 304 nickel content 8.

It is not wiped in the same outdoor atmosphere, it will not rust in 304, 3-4 years, and 301 will start to rust in 6 months. It will be difficult to see in 2 years.

Stainless steel (Stainless Steel) is an abbreviation for stainless acid-resistant steel. Steels that are resistant to weakly corrosive media such as air, steam, and water, or stainless steels are called stainless steel; and chemical-resistant media (such as acid, alkali, and salt) The type of steel that is corroded is called acid-resistant steel. Because of the difference in chemical composition between the two, their corrosion resistance is different. Generally, stainless steel is generally not resistant to corrosion by chemical media, while acid-resistant steel is generally stainless.