201, 304, 316 stainless steel difference and choice
1.As we all know, stainless steel is short for stainless steel, which is resistant to air, steam, water and other weak corrosive media or stainless steel grades, such as 201 (1Cr17Mn6Ni5N), 202 and other 2 series steel grades; The steel grade that is resistant to chemical corrosion media (acid, alkali, salt, etc.) becomes acid-resistant steel, such as 304 (06Cr19Ni10), 316 (0Cr17Ni12Mo2) and other 3 series steel grades. Due to the difference in the chemical composition of the two, their corrosion resistance is different, like 2 series of stainless steel is generally not resistant to the corrosion of chemical media, and 3 series stainless steel has the ability to resist the corrosion of chemical media.
2.Common marking methods on the market include chemical formula (06Cr19Ni10) and SUS (SUS304), of which 06Cr19Ni10 generally indicates national standard production, 304 generally indicates American ASTM standard production, and SUS304 indicates Japanese standard production.
3.Of course, stainless steel is not completely rust, but relative to ordinary steel has better corrosion resistance, even if the corrosion resistance of stainless steel is also a great difference, like 2 series and 3 series is obvious. Sometimes we get a material without a long environmental test before it is difficult to distinguish the material is 2 series or 3 series, there are many detection methods on the market, briefly introduce two relatively simple methods, one is to look at the appearance, 201 as the representative of the 2 series contains higher carbon and manganese, the surface will be dark even if polished will be black bright; The second is to look at the cutting spark, 201 material is relatively hard cutting when the spark will be more not larger
