GRADE : AISI 4140, SCM 440, 709 SHAFT, EN19, 40CR Alloy steel is a type of steel that has additional elements (other than carbon) added to enhance its mechanical properties. These added elements, such as chromium, nickel, and molybdenum, improve strength, hardness, wear resistance, and toughness. The specific combination and amounts of these alloying elements determine the alloy steel's characteristics and applications. 合金钢是一种添加了碳以外的其他元素以增强机械性能的钢。这些添加的元素，例如铬、镍和钼，可以提高强度、硬度、耐磨性和韧性。这些合金元素的具体组合和含量决定了合金钢的特性和应用。
