Stainless Steel Grades Commonly used stainless steel models are often represented by digital symbols, including 200 series, 300 series, and 400 series, which are the representation methods in the United States, such as 201, 202, 302, 303, 304, 316, 410, 420, 430, etc. The stainless steel model in China is It is represented by element symbols and numbers, such as 1Cr18Ni9, 0Cr18Ni9, 00Cr18Ni9, 1Cr17, 3Cr13,...