|
The bearing steel balls we manufacture apply multinational
standards or customers' standards,
and the technology index of heat treatment can be reached by special process according
to our
customers' requirements. The following are standards of General.
International Standards： ISO3290-2002
Chinese Standards: GB308-2002
German Standards: DIN5401-11.1993
American Standards: ANSI/AFBMA-10.1989
Technology Parameter of Heat Treatment:
Hardness:Consult Chinese Standards GB/T308-2002
|
diameter
|
hardness
|
|
surpass
|
to
|
HRC
|
|
--
|
30
|
60--66
|
|
30
|
50
|
59--64
|
|
50
|
--
|
58--64
|
Burden of Crush:Consult
Chinese StandardsJB/T1255-2001
Corporation:KN
|
dia.
|
burden
|
dia.
|
burden
|
dia.
|
burden
|
|
3.0000
|
4.80
|
13.0000
|
87.22
|
26.0000
|
333.20
|
|
3.1750
|
5.39
|
13.4938
|
94.08
|
26.9875
|
357.70
|
|
3.9688
|
8.43
|
14.0000
|
100.94
|
28.0000
|
385.14
|
|
4.0000
|
8.53
|
14.2875
|
104.86
|
28.5750
|
396.90
|
|
4.5000
|
10.78
|
15.0000
|
115.64
|
30.0000
|
439.04
|
|
4.7625
|
12.05
|
15.0812
|
116.62
|
30.1625
|
441.00
|
|
5.0000
|
13.33
|
15.8750
|
128.38
|
31.7500
|
487.06
|
|
5.5562
|
16.27
|
16.0000
|
131.32
|
32.0000
|
494.90
|
|
5.9531
|
18.13
|
16.6688
|
142.10
|
33.3375
|
534.10
|
|
6.0000
|
19.01
|
17.0000
|
147.00
|
34.0000
|
557.62
|
|
6.3500
|
21.27
|
17.4625
|
154.84
|
34.9250
|
582.13
|
|
6.7469
|
24.00
|
18.0000
|
164.64
|
35.0000
|
588.00
|
|
7.0000
|
25.87
|
18.2562
|
168.56
|
36.0000
|
617.40
|
|
7.1438
|
26.95
|
19.0000
|
182.77
|
36.5125
|
632.10
|
|
7.9375
|
32.83
|
19.0500
|
183.26
|
38.0000
|
683.06
|
|
8.0000
|
33.32
|
19.8438
|
198.94
|
38.1000
|
689.00
|
|
8.7312
|
39.69
|
20.0000
|
201.88
|
40.0000
|
745.78
|
|
9.0000
|
41.94
|
20.6375
|
214.62
|
41.2750
|
798.70
|
|
9.5000
|
46.84
|
21.0000
|
241.03
|
42.0000
|
823.20
|
|
9.5250
|
47.04
|
22.0000
|
241.03
|
44.4500
|
911.40
|
|
10.0000
|
51.94
|
22.2250
|
246.96
|
45.0000
|
931.00
|
|
10.3188
|
54.88
|
23.0000
|
262.64
|
47.6250
|
103.88
|
|
11.0000
|
62.72
|
23.0188
|
257.74
|
48.0000
|
1068.20
|
|
11.1125
|
63.70
|
23.8125
|
281.26
|
50.0000
|
1156.40
|
|
11.5000
|
68.51
|
24.0000
|
287.14
|
50.8000
|
1166.20
|
|
11.5094
|
68.60
|
25.0000
|
309.68
|
|
|
|
11.9062
|
73.50
|
25.4000
|
318.50
|
|
|
|
12.0000
|
74.48
|
|
|
|
|
|
12.3031
|
78.40
|
|
|
|
|
|
12.7000
|
83.30
|
|
|
|
|
|
