“钢铁”是钢和铁的统称。钢是钢、铁是铁,它们的制造方法两样,性质和用途也有不同。但组成钢和铁的主要元素——铁和碳——倒是相同的。钢是指“碳钢”和“合金钢”。碳钢是铁和碳这两个元素所组成的。在碳钢中再加入某些金属,如铅、铝、锰、铬、钼或钢等,就可制成各种合金钢。 “Steel” is the collective name for steel and iron. Steel is steel and iron is iron. Their manufacturing methods are different and their properties and uses are also different. But the main elements that make up steel and iron—iron and carbon—are the same. Steel refers to “carbon steel” and “alloy steel.” Carbon steel is composed of two elements: iron and carbon. By adding certain metals such as lead, aluminum, manganese, chromium, molybdenum or steel to carbon steel, various alloy steels can be made.