对特殊钢尚无统一的定义和概念，一般认为特殊钢是指具有特殊的化学成分（合金化）、采用特殊的工艺生产、具备特殊的组织和性能、能够满足特殊需要的钢类。
其它牌号：HMD5 DM, DAC S-MAGIC, SLD, ARK1 S-MAGIC, SLD SLD, SLD8 YXM1, CRD SLD SLD, SLD8 S-MAGIC, SLD S-MAGIC, SLD SGT, SAT XVC5, HAP40 HAP40 S-MAGIC, SLD YXM1,YXR7 YXM1, HAP40 YXM1, HAP40 XVC5 YXM1, HAP40 YXM1,YXR7 XVC5 XVC5 YXM1, HAP40 SLD10, YXM1,YXR7