1. food-grade stainless steel: food-grade stainless steel refers to the part of food machinery that comes into contact with food and must meet certain food safety requirements. Because the food production process uses a lot of acid and alkali, and stainless steel contains chromium, unqualified stainless steel will dissolve out chromium at various prices, which is toxic; It also limits the content of alloy impurity elements such as lead and cadmium.

2. 304 stainless steel: 304 stainless steel is a common material in stainless steel, with a density of 7.93 g/cm3, also known as 18/8 stainless steel in the industry. High temperature resistance of 800 degrees, good processability and high toughness, widely used in industry, furniture decoration industry and food and medical industry. Common marking methods in the market are 06Cr 19Ni 10 and SUS304, in which 06Cr 19Ni 10 generally represents national standard production, 304 generally represents ASTM standard production and SUS 304 represents Japanese standard production. 304 is a general-purpose stainless steel, which is widely used to manufacture equipment and parts that require good comprehensive performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 18% chromium and more than 8% nickel. 304 stainless steel is a stainless steel brand produced according to American ASTM standard.