1. Diameter tolerance and roundness
Diameter
|
30
|
40
|
50
|
60
|
70
|
80
|
90
|
100
|
110
|
120
|
125
|
150
|
(mm)Tolerance
|
±2
|
+3,-2
|
+4,-3
|
+5,-4
|
(%)Roundness
|
≤2
|
≤3
|
≤4
|
≤5
|
2.Chemical composition
Brand
|
C(%)
|
Si(%)
|
Mn(%)
|
Cr(%)
|
Cu(%)
|
Mo(%)
|
P(%)
|
S(%)
|
Ni(%)
|
45#
|
0.42-0.50
|
0.17-0.37
|
0.5-0.80
|
0-0.25
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
50Mn
|
0.48-0.56
|
0.17-0.37
|
0.60-1.0
|
0-0.25
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
60Mn
|
0.57-0.65
|
0.17-0.37
|
0.70-1.0
|
0-0.25
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
65Mn
|
0.62-0.70
|
0.17-0.37
|
0.90-1.0
|
0-0.25
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
U71MN
|
0.65-0.76
|
0.17-0.37
|
1.10-1.40
|
0-0.25
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
40Cr
|
0.37-0.45
|
0.17-0.37
|
0.50-0.8
|
0.80-1.1
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
42CrMo
|
0.38-0.45
|
0.17-0.37
|
0.50-0.80
|
0.90-1.2
|
0-0.03
|
0.15-0.25
|
0-0.035
|
0-0.035
|
0-0.30
|
70Cr2
|
0.65-0.75
|
0.20-0.30
|
0.75-0.90
|
0.55-0.70
|
0-0.25
|
0-0.30
|
0-0.030
|
0-0.030
|
0-0.30
|
40Mn2
|
0.37-0.44
|
0.17-0.37
|
1.4-1.8
|
0-0.25
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.30
|
0-0.30
|
B-2
|
0.70-0.80
|
0.17-0.37
|
0.70-0.80
|
0.40-0.60
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
B-3
|
0.58-0.66
|
1.2-1.6
|
0.65-0.80
|
0.70-0.90
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
B-4
|
0.60-0.65
|
1.6-1.7
|
0.7-0.8
|
0.7-0.8
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
B-6
|
0.75-0.85
|
0.2-0.40
|
0.9-1.0
|
0.85-0.95
|
0-0.25
|
0.06-0.13
|
0-0.035
|
02-0.035
|
0.06-0.13
|
B-6A
|
0.82-0.95
|
0.20-0.40
|
0.92-1.02
|
0.80-0.95
|
0-0.25
|
0.06-0.10
|
0-0.035
|
0-0.035
|
0.06-0.10
|
B-7
|
0.35-0.40
|
0.17-0.37
|
0.7-0.8
|
0.9-1.0
|
0-0.25
|
0-0.30
|
0-0.035
|
0-0.035
|
0-0.30
|
BU
|
0.95-1.05
|
0.17-0.37
|
0.9-1.10
|
0.40-0.60
|
0-0.15
|
0-0.05
|
0-0.035
|
0-0.035
|
0-0.30
|
Gr15
|
0.95-1.05
|
0.15-0.35
|
0.20-0.40
|
1.30-1.65
|
0-0.25
|
0-0.10
|
0-0.027
|
0-0.020
|
0-0.10
|
3.Technical specification
Brand
|
Breakage rate
|
Hardness
(HRC)
|
Impact value
(J/cm²)
|
Drop times
|
Micro structure
|
45#
|
<1%
|
≥45
|
≥12
|
≥8000
|
M+C
|
50Mn
|
<1%
|
≥55
|
≥12
|
≥10000
|
M+C
|
60Mn
|
<1%
|
≥55
|
≥12
|
≥12000
|
M+C
|
65Mn
|
<1%
|
≥58
|
≥12
|
≥12000
|
M+C
|
U71MN
|
<1%
|
≥58
|
≥12
|
≥12000
|
M+C
|
40Cr
|
<1%
|
≥55
|
≥12
|
≥12000
|
M+C
|
42CrMo
|
<1%
|
≥55
|
≥12
|
≥12000
|
M+C
|
70Cr2
|
<1%
|
≥58
|
≥12
|
≥12000
|
M+C
|
40Mn2
|
<1%
|
≥55
|
≥12
|
≥12000
|
M+C
|
B-2
|
<1%
|
≥58
|
≥12
|
≥15000
|
M+C
|
B-3
|
<1%
|
≥60
|
≥12
|
≥15000
|
M+C
|
B-4
|
<1%
|
≥60
|
≥12
|
≥15000
|
M+C
|
B-6
|
<1%
|
≥60
|
≥12
|
≥15000
|
M+C
|
B-6A
|
<1%
|
≥60
|
≥12
|
≥15000
|
M+C
|
B-7
|
<1%
|
≥60
|
≥12
|
≥15000
|
M+C
|
BU
|
<1%
|
≥60
|
≥12
|
≥15000
|
M+C
|
Gr15
|
<1%
|
≥60
|
≥12
|
≥15000
|
M+C
|