20NiCrMoS6-4  SBB450 SBB450M SBB480 SBB480M SBB42 SBB46 SBB46 SBB46M SBB49 SBB49M HRS1 HRS2 HRS3 HRS4 STHA12 STHA13 STHA20 STHA22 STHA23 STHA24 STHA25 STHA26 
機械結構鋼：STKM11A STKM12A STKM12B STKM12C STKM13A STKM13B STKM13C STKM14A STKM14C STKM15A STKM15C STKM16A STKM16C STKM17A STKM17C STKM18A STKM18B STKM18C STKM19A STKM19C STKM120A SCr420TK SCM415TK SCM418TK SCM420TK SCM430TK SCM435TK SCM440TK MSWR6 MSWR8 MSWR10 MSWR12  鋼材特性：此鋼硬度及結構均勻，切削及拋光性能優(yōu)異，適合火花機操作，可作火焰加硬，表面鍍鉻及氧化處理。