Although the materials are different, the stainless steel vacuum flasks produced by the two materials look the same. The two most common are 304 (18/8) and 201 stainless steel. Stainless steel vacuum flasks are generally available in 201, 202 and 304 (18/8) stainless steels. In the test, it is found that: nitric acid below the boiling temperature of concentration ≤ 65%, 304 stainless steel has strong corrosion resistance. 201 stainless steel color will be darker than 304, 304 stainless steel contains more chromium, has excellent corrosion resistance and better resistance to intergranular corrosion. This is why the industry calls this type of stainless steel 18/8 stainless steel.Ĭommonly used stainless steels are mainly 201 and 304 stainless steel, 201 stainless steel contains manganese, and the corrosion performance is general, long-term drinking water containing iron and manganese exceeds the standard can cause loss of appetite, vomiting, diarrhea, gastrointestinal disorders, stool disorders and other diseases. Common judgments in the industry consider that as long as the Ni content is greater than 8% and the Cr content is greater than 18%, it can be considered as 304 stainless steel. The specific requirements are stipulated by the product standard. The important elements in 304 are Ni, Cr, but are not limited to these two elements. For 304 stainless steel, the Ni element in its composition is very important, which directly determines the corrosion resistance of 304 stainless steel and its value. It is now a recognized health material that can be used in medical treatment and implanted in the human body. 304 stainless steel is also called 18/8 stainless steel in the industry.

Will 304 stainless steel rust