名 稱

鑄鋼丸

化學成分

碳(C)

0.80～1.20%

錳(Mn)

0.60～1.20%

硅(Si)

0.40～1.20%

硫(S)

≤0.04%

磷(P)

≤0.04%

平均硬度

（500g荷載下測定）

常規：40～45HRC (377～509HV)

硬度偏差

較大偏差范圍為±3.0HRC或±40HV

金相組織

均勻的回火馬氏體或回火屈氏體＋彌散分布碳化物

較小密度

（酒精置換法測定)

7.2g/cm³

篩孔規格

相應篩網上累積殘留率%

目數

孔徑mm

SS-2.5

SS-2.0

SS-1.7

SS-1.4

SS-1.2

SS-1.0

SS-0.8

SS-0.6

SS-0.5

SS-0.4

SS-0.3

SS-0.2

7

2.80

all pass

8

2.36

all pass

10

2.00

≥85%

all pass

all pass

12

1.70

≥97%

≥85%

≤5%

all pass

14

1.40

≥97%

≥85%

≤5%

all pass

16

1.18

≥97%

≥85%

≤5%

all pass

18

1.00

≥96%

≥85%

≤5%

all pass

20

0.850

≥96%

≥85%

≤10%

all pass

25

0.710

≥96%

≥85%

≤10%

all pass

30

0.600

≥96%

≥85%

≤10%

all pass

35

0.500

≥97%

≥85%

≤10%

40

0.425

≥97%

≥85%　

all pass

45

0.355

≥97%

≥80%

≤10%

50

0.300

≥90%

80

0.180

≥80%

115

0.125

≥90%

120

0.075

325

0.045

SAE

S-780

S-660

S-550

S-460

S-390

S-330

S-280

S-230

S-170

S-130

S-110

S-70