Designating an alloy steel

摘要

The first two digits of a designation number define the principal alloying element or elements, which identify the following 12 categories of alloy steels. Manganese steels are designated as 13XX series. There are four standard grades having 1.60 to 1.90 percent Mn. Nickel steels are designated as 23XX and 25XX series. Two nonstandard grades are available: AISI A2317 (3.25 to 3.75 percent Ni) and AISI A2515 (4.75 to 5.25 percent Ni). Nickel-chromium steels are designated as 31XX, 32XX, 33XX and 34XX series.