Food-grade stainless steel refers to the stainless steel material certified according to the national standard GB 4806.9-20 16, which can really contact with food without causing physical injury. Only stainless steel materials certified according to the latest national standard GB 4806.9-20 16 can be regarded as food-grade stainless steel. The so-called food grade of food grade 304 stainless steel has not passed the national standard certification, and 304 stainless steel is widely used in industry, and its influence on human body is unknown.
Second, the content is different.
The main difference between food-grade stainless steel and 304 stainless steel lies in the content of harmful elements.
The content of harmful elements in food-grade stainless steel must be lower than the national standard, while non-food-grade stainless steel is generally mainly used for industry or civil use. The harmful elements are mainly sulfur, phosphorus, lead and hexavalent chromium.
Third, the use is different.
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 17% chromium and more than 8% nickel. Generally, 304 stainless steel is not food grade, but special processing is food grade.
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Baidu encyclopedia-food grade stainless steel