质 10 S10C ?CK10 - 10 -
碳 15 S15C CK15 - 15 -
素 20 S20C CK22 1020 20 -
结 25 S25C CK25 1025 25 C25
构 30 S30C - 1030 30 C30
?钢 35 S35C - ?1035 35 C35
40 S40C CK40 1040 40 C40
45 S45C ?CK45 1045 45 C45
50 S50C - 1050 50 C50
55 S55C - 1055 55 C55
60 S60C CK60 1060 60 C60