The grades of free cutting steel include but are not limited to Y15, Y40Mn, Y12, Y12Pb, Y15Pb, Y20, Y30, Y35, Y40Mn, etc.

Y15 and Y40Mn are the basic grades of free cutting steel, where Y15 represents a free cutting steel with an average carbon content of 0.15%, while Y40Mn represents a free cutting steel with an average carbon content of 0.40% and a higher manganese content. one

Y12 and Y12Pb belong to free cutting steels containing sulfur and phosphorus, among which Y12Pb contains lead element, providing better cutting performance. two

Y15Pb, Y20, Y30, Y35, and other common grades of free cutting steel are classified and named based on their carbon content, manganese content, and whether they contain other free cutting elements such as lead and calcium. twelve

The naming of these grades follows certain rules, such as Arabic numerals representing the average carbon content, and numbers with the suffix "Y" representing specific grades. In addition, free cutting steel can be further divided into sulfur free cutting steel, lead free cutting steel, calcium free cutting steel, etc. based on the different content of free cutting elements. It can also be further divided into automatic machine steel, structural free cutting steel, and special free cutting steel according to different uses.