Tell you, what is food grade stainless steel
Food grade stainless steel refers to stainless steel materials that meet the requirements of “National Standards of the People’s Republic of China/Hygienic Standards for Stainless Steel Tableware Containers” GB 9684-88, and its lead and chromium content is much lower than that of ordinary stainless steel.
Food grade stainless steel refers to the food-contact part of food machinery and must meet certain food safety requirements. Because a lot of acid and alkali is used in the food production process, and stainless steel contains chromium, unqualified stainless steel will dissolve chromium at various prices, which is toxic; and it is required to limit the content of various alloy impurities elements such as lead and cadmium.
The difference between food grade stainless steel and 304 stainless steel:
When the heavy metal migration of stainless steel products exceeds the limit, it may endanger human health.
Therefore, the production of stainless steel cookware requires a balance between corrosion protection and safety. If the content of nickel and chromium is high, the anti-corrosion function will be enhanced, but the subsequent precipitation of nickel and chromium will also increase, which means that the safety risk will increase.
Because of this, the “Stainless Steel Products” (GB9684-2011) national food safety standard has made strict regulations on the precipitation of chromium, cadmium, nickel, lead, and other heavy metals in cookware.
Why does the national standard not stipulate the migration limit of manganese?
One reason is that as the manganese content in stainless steel increases, it is accompanied by the loss of functions such as corrosion resistance and rust resistance of the cookware. Once the manganese content reaches a certain value, this product cannot be used as cookware or cannot be called stainless steel cookware. NS. But even with such a high manganese content, it generally does not affect health.
Therefore, although the national food safety standard does not specify the manganese content, it clearly points out that the main part of the food container must be made of stainless steel that meets the national standard.
Food grade stainless steel is stainless steel that meets the GB9684 standard.
304 stainless steel is a very common stainless steel, also known as 18-8 stainless steel in the industry. Its corrosion resistance is better than 430 stainless iron, corrosion resistance and high-temperature resistance, and good processing performance. Therefore, it is widely used in industry and furniture decoration industry and food and medical industry, such as some high-end stainless steel tableware, bathroom, and kitchen utensils.
304 is versatile stainless steel, which is widely used to make equipment and parts that require good overall 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, and special processed ones are food grade.