Introduction to 304 Stainless Steel

304 stainless steel is a very common type of stainless steel, also known as eighteen-eighths stainless steel in this industry. Corrosion resistance of it is preferable to that of 430 stainless steel, but the price of it is cheaper than that of 316 stainless steel. 304 stainless steel is widely used in daily life, such as: high grade stainless steel cutlery, outdoor stainless steel railings and 304 stainless steel coil products.

Although this type of stainless steel is very common all over the world, but the name "304 stainless steel" came from the United States. Many people think that the 304 stainless steel is a model called in Japan, but strictly speaking, Japanese official call of 304 stainless steel is "SUS304". Currently, common indicating methods of this type of stainless steel on the market include 06Cr19Ni10, 304, and SUS304. Among them, 06Cr19Ni10 generally means Chinese standard production, 304 generally means ASTM standard production, and SUS304 means JIS standard production.

304 is a universal stainless steel. It is widely used for making equipment and parts require for good overall performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 16% chromium and over 8% nickel content. 304 stainless steel is a mark of stainless steel produced in accordance with United States ASTM standards. 304 is equal to 0Cr18Ni9 stainless steel in China. (GB/T 20878-2007 has been changed to 06Cr19Ni10).

Product Standard

It is a very important parameter for 304 stainless steel, directly determining its ability to resist corrosion and its value. The most important element of 304 stainless steel is Ni and Cr, but they are not the only two elements. The specific requirements are stipulated by the product standard. Industry common decision situation finds that as long as the content of Ni is greater than 8%, and the content of Cr is greater than 18%, it can be regarded as 304 stainless steel. That's why this type of stainless steel is called eighteen-eighths stainless steel in this industry. In fact, related product standard has very clear rules to 304, which is different to stainless steel of different shapes.

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