According to the degree of alloying of the austenite matrix, the 304 stainless steel plate can be divided into two basic series: chromium-nickel austenite and chromium-manganese stainless steel plate. The chromium-nickel type is formed by nickel as the main austenite structure. The latter mainly uses manganese as an austenite forming element.
However, because stainless steel is added to stainless steel with more than 15% chromium, even if the manganese content is more than 25%, it can't produce complete austenite. Therefore, it must be combined with carbon and nitrogen, and there must be a small amount of nickel. This stainless steel is also called chromium manganese nitrogen or chromium manganese nickel nitrogen stainless steel. In addition, in the 304 stainless steel plate, elements such as molybdenum, silicon, copper, titanium and tantalum are also provided to provide some special properties.
Generally, 304 stainless steel plates contain 16%-26% chromium, and the nickel content is as high as 18%. In recent years, the super-stainless steel plates successfully developed have a chromium content of more than 20%, a maximum of 33%, and a molybdenum content of 7% in stainless steel, which can perfectly solve the corrosion problem that is difficult to solve in conventional stainless steel.
Although there are many grades of 304 stainless steel plates, there are only a few brands for mass production and wide use, including 0Cr18Ni9Cu3, 00Cr18Ni10N, 0Cr17NI12M02N and 00Cr17Ni14M02N, and the corresponding improved grades probably account for about half of the 304 stainless steel output.
Since the introduction of the 304 stainless steel plate in the 1920s, it has developed over the past century and has many brands. Austenitic stainless steels are often welded in petrochemicals, papermaking equipment and power plants, many of which are welded using austenitic stainless steel.