What is 304 stainless steel

304 stainless steel is a kind of stainless steel, chromium element content up to 19%, nickel element up to 9%, are called 304 stainless steel. It is resistant to high temperature 800℃ and has good processing performance and high toughness.

304 stainless steel as a more widely used, has a better corrosion resistance, temperature resistance, ultra-low temperature, compressive strength characteristics, stamping bending and other heat treatment performance is good, with 304 stainless steel made of pipe, has been in the residential community drinking water and community health drinking water pipeline has made universal use.

What is food-grade 304 stainless steel

Food-grade 304 stainless steel is the part of food machinery that comes in contact with food and must meet certain food safety requirements. Since the production process of food machinery uses a large number of acids and bases, and stainless steel contains chromium, unqualified stainless steel will dissolve various valences of chromium and produce toxic substances, so food-grade stainless steel will be required to limit the content of various alloy impurity elements such as lead and cadmium.

Physical and chemical indicators of stainless steel materials and products in direct contact with food

What is the difference between food-grade 304 stainless steel and ordinary 304 stainless steel?

Different production standards

Food-grade 304 stainless steel is a grade of stainless steel produced in accordance with ASTM standards. General 304 stainless steel is stainless steel produced according to Chinese standards.

Different functions

Food-grade 304 stainless steel is mainly used in the food industry to produce food equipment and equipment. Ordinary 304 stainless steel is widely used, mainly for construction.

In summary, food-grade 304 stainless steel is to meet the heavy metal precipitation standards of 304 stainless steel; and ordinary 304 stainless steel, is not tested by the national standard GB 9684.

Tips: Some stainless steel products will play a "food-grade 304" steel mark, such marks still belong to the unofficial product, the standard does not have any official "logo" exists.

Therefore, when we buy tableware (in fact, "tableware" is not quite standard, should be " food-grade stainless steel"), the main look at its packaging there is no "GB4806.9-2016 "The words, only after the testing of the product, we can feel confident to buy.