c
机械结构用碳素钢 S10C S12C S15C S17C S20C S22C S25C S28C S30C S33C S35C S38C S40C S43C S45C S48C S50C S53C S55C S58C S9CK S15CK S20CK SAPH32 SAPH38 SAPH41 SAPH45 STKM11A STKM12A STKM12B STKM12C STKM13A STKM13B STKM13C STKM14A STKM14B STKM14C STKM1** STKM15C STKM16A STKM16C STKM17A STKM17C STKM18A STKM18B STKM18C STKM19A STKM19C STKM20A …… 合金结构钢 SMN420 SMN433 SMN438 SMN443 SMNC420 SMNC443 SCR415 SCR420 SCR430 SCR435 SCR440 SCR445 SNC236 SNC415 XNC631 SNC815 SNC836 SNC236