弹簧是重要的机械另件,广泛用于运输工具如汽车、拖拉机、铁道车辆以及仪表工业等方面。弹簧在冲击、振动或长期交变应力下使用。所以要求弹簧钢有高的抗拉强度、弹性极限、高的疲劳强度。在工艺上要求弹簧钢有一定的淬透性、不易脱碳、表面质量好等。碳素弹簧钢即含碳量在0.6～0.9%范围内的优质碳素结构钢(包括正常和较高含锰 Spring is an important mechanical parts, widely used in transport vehicles such as cars, tractors, railway vehicles and instrumentation industries. Spring in the impact, vibration or long-term use of alternating stress. Therefore, spring steel requires high tensile strength, elastic limit, high fatigue strength. In the process of spring steel requires a certain degree of hardenability, not easy decarburization, surface quality and so on. Carbon spring steel that carbon content of 0.6 to 0.9% range of high-quality carbon structural steel (including normal and high manganese