美国钢铁协会对钢的统计分为碳素钢、不锈钢(包括耐热钢)和其他合金钢。合金钢又按合金元素或用途分为C—B、Ni、Mo、Mn、Mn—Mo、Cr、Cr—V、Ni—Cr、Ni—Mo、Ni—Cr—Mo—V、Ni—Cr—Mo、Si—Mn、高强度,电工硅钢和其他17类。美国的合金钢、不锈钢和高碳钢就相当于美国的特殊钢。而美国的许多技术文章中所涉及的特殊钢主要是工具钢、不锈钢、耐热钢和某些 American Iron and Steel Association’s statistics on the steel is divided into carbon steel, stainless steel (including heat-resistant steel) and other alloy steel. The alloy steel is in turn divided into C-B, Ni, Mo, Mn, Mn-Mo, Cr, Cr-V, Ni-Cr, Ni-Mo, Ni-Cr-Mo- Mo, Si-Mn, high strength, electrical silicon steel and other 17 categories. The United States of alloy steel, stainless steel and high carbon steel is equivalent to the United States special steel. The United States, many technical articles involved in the special steel is mainly tool steel, stainless steel, heat-resistant steel and some