项目

国家标准钢丸

高质量钢丸

化 
学 
成 
份 
%

碳C

0.85-1.20

0.85-1.0

硅Si

0.40-1.20

0.70-1.0

　锰Mn

0.60-1.20

0.75-1.0

硫S

<0.05

<0.030

磷P

<0.05

<0.030

硬度

钢丸

HRC40-50
HRC55-62

HRC44-48
HRC58-62

密度

钢丸

≥7.20 g/cm3

7.4g/cm3

金相组织

回火马氏体或屈氏体

回火马氏体＋贝氏体 复相组织

外观

圆球形 
空心颗粒﹤10%
裂纹颗粒<15%

圆球形 
空心颗粒﹤5％ 
裂纹颗粒<10%

筛网号 

英寸 

筛网 
孔径 

SAE J444 钢丸

S930

S780

S660

S550

S460

S390

S330

S280

S230

S170

S110

S70

6

0.132

3.35

All Pass

7

0.111

2.80

All Pass

8

0.0937

2.36

≥90%

All Pass

10

0.0787

2.00

≥97%

≥85%

All Pass

All Pass

12

0.0661

1.70

≥97%

≥85%

≤5%　

All Pass

14

0.0555

1.40

≥97%

≥85%

≤5%

All Pass

16

0.0469

1.18

≥97%

≥85%

≤5%

All Pass

18

0.0394

1.00

≥96%

≥85%

≤5%

All Pass

20

0.0331

0.850

≥96%

≥85%

≤10%

All Pass

25

0.0280

0.710

≥96%

≥85%

≤10%

30

0.0232

0.600

≥96%

≥85%

All Pass

35

0.0197

0.500

≥97%

≤10%

40

0.0165

0.425

≥85%

All Pass

45

0.0138

0.355

≥97%

≤10%

50

0.0117

0.300

≥80%

80

0.007

0.180

≥90%

≥80%

120

0.0049

0.125

≥90%

200

0.0029

0.075

GB

2.8

2.5

2.0

1.7

1.4

1.2

1.0

0.8

0.6

0.4

0.3

0.2