1, 304 stainless steel is food grade stainless steel.
2, food grade stainless steel is a stainless steel material that meets the provisions of the "Chinese People's *** and National Standards/Stainless Steel Food Container Hygiene Standards" GB4806.9-2016, and its lead content is much lower than that of general stainless steel.
3, food-grade stainless steel is the part of food machinery in contact with food, must meet certain food safety requirements. Because the food production process to use a lot of acid and alkali, and stainless steel containing chromium, unqualified stainless steel, will dissolve a variety of valence of chromium, toxic; and requirements to limit the content of lead, cadmium and other various alloy impurity elements.
Expanded information:
A. The main difference between food-grade stainless steel and stainless steel is that:
1. Food-grade 304 stainless steel is produced in accordance with the American ASTM standard production out of a grade of stainless steel. 304 in the most important elements are Ni, Cr, but is not limited to these two elements. Specific requirements specified by the product standard. Industry common judgment that as long as the Ni content is greater than 8%, Cr content is greater than 18%, can be considered as 304 stainless steel.
2, stainless steel (Stainless Steel) is the abbreviation of stainless acid-resistant steel, stainless steel refers to air, steam, water and other weak corrosive media and acids, alkalis, salts and other chemically impregnated media corrosion steel, also known as stainless acid-resistant steel. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.
3, stainless steel in the main alloying element is Cr (chromium), only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, the general Cr (chromium) content of stainless steel is at least 10.5%. Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements.
Two, the specific physical and chemical indicators are as follows:
1, item austenitic stainless steel ferritic martensitic stainless steel
2, lead (as Pb), mg/L 4% acetic acid immersion solution ≤ 1.0 1.0 .
3, chromium (as Cr), mg/L 4% acetic acid immersion solution ≤ 0.5
4, nickel (as Ni), mg/L 4% acetic acid immersion solution ≤ 3.0 1.0 .
5, Tin (as Sn), mg/L 4% acetic acid solution ≤ 0.02 0.02 .
6, arsenic (As), mg/L 4% acetic acid solution ≤ 0.04 0.04 .
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