APFC390 NKCA390 APFC390 KBCF390 NCAH390 SANC440 JSC440R APFC440 SPC440HY APFC440 APFC440 NKCA440 APFC440 KBCF440 NCAH440 SANC490 APFC490 APFC490 SPFC490 APFC490 NKCA490 APFC490 KBCF490 SANC540 APFC540 钢材特点：高耐磨性，高抗压强度，淬硬后，表面有很高硬度。良好的淬火韧性，淬硬时有优越稳定性，对 回头软点有良好的抵抗性。