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明治大学TOP > 研究・知財戦略機構TOP > 研究活動状況 > 私立大学学術研究高度化推進事業（大型研究） > 学術フロンティア推進事業 > 明治大学学術フロンティア信頼性データバンク >高炭素クロム鋼SUJ2の回転曲げ疲労特性データシート(HRC60)
SUJ2(HRC60) SUJ2(HRC30) ボールねじ ボールブシュ ボールスプライン 深溝玉軸受 S55cx
高炭素クロム鋼SUJ2の回転曲げ疲労特性データシート
PARTICULARS FOR MECHANICAL PROPATIES TEST
 
Pure bending test properties
 
Table.1 Test piece properties
Hardness HRC36,60
Geometry
 
Tension test properties
Table.2 Test piece properties
Hardness HRC36,60
Geometry
For HRC36


For HRC60
 
Table.3 Mechanical properties for piece
Rockwell hardness [HRC]
N (35.6, 1.452)
N (60, 0.652)
Proportional limit for bending [GPa]
N (0.947, 0.552)
N (2.38, 0.532)
Tensile strength [GPa]
N (1.09, 0.0142)
N (2.1, 0.122)
 
 
Table.4 Heat treatment conditions of SUJ2 steel
Hardness
Normalizing
Quenching
Tempering
HRC36
-
830℃/20min
170℃/120min
HRC60
-
830℃/20min
600℃/90min
 
Table.5 Chemical composition (mass%, O: ppm)
  C Si Mn P S Cr Mo Ni Cu O
Product analysis 0.98 0.18 0.37 0.016 0.003 1.42 0.03 0.07 0.12 6
Requierment Max 1.10 0.35 0.50 0.03 0.03 1.60 0.08 - - -
Min 0.95 0.15       1.30        
 
Table.6 Mechanical properties for test piece
No
Hardness[HRC]
No
Pure Bendin
Proportional limit[GPa]
No
Tensile strength[GPa]
HRC36
HRC60
HRC36
HRC60
HRC36
HRC60
1
32.420
58.520
1
0.768
2.186
1
1.051
1.812
2
32.660
58.980
2
0.776
2.216
2
1.072
1.857
3
32.740
59.000
3
0.776
2.272
3
1.073
1.902
4
34.120
59.075
4
0.790
2.332
4
1.079
1.917
5
34.260
59.080
5
0.826
2.344
5
1.088
1.985
6
34.280
59.620
6
0.840
2.352
6
1.088
2.005
7
34.300
59.680
7
0.899
2.360
7
1.088
2.019
8
34.740
59.720
8
0.921
2.369
8
1.089
2.023
9
34.840
59.880
9
0.935
2.373
9
1.089
2.033
10
35.320
59.900
10
0.955
2.375
10
1.090
2.043
11
35.400
59.940
11
0.975
2.379
11
1.092
2.054
12
35.440
59.940
12
0.995
2.405
12
1.093
2.071
13
35.520
59.940
13
0.995
2.413
13
1.094
2.075
14
35.600
60.000
14
0.995
2.427
14
1.095
2.080
15
35.600
60.000
15
1.005
2.431
15
1.095
2.083
16
35.620
60.040
16
1.084
2.433
16
1.095
2.083
17
35.800
60.220
17
1.114
2.439
17
1.095
2.097
18
35.820
60.280
18
1.154
2.465
18
1.096
2.100
19
35.860
60.320
19
1.194
2.475
19
1.097
2.109
20
35.880
60.340
20
1.097
2.113
21
36.460
60.340
21
1.099
2.135
22
36.480
60.360
22
1.099
2.138
23
36.520
60.420
23
1.099
2.145
24
36.700
60.440
24
1.100
2.148
25
36.800
60.620
25
1.100
2.153
26
36.820
60.640
26
1.101
2.155
27
36.820
60.700
27
1.101
2.172
28
37.180
60.720
28
1.101
2.179
29
37.220
60.800
29
1.101
2.183
30
37.780
60.900
30
1.102
2.204
31
1.107
2.216
32
1.112
2.262
33
1.114
2.266
34
1.114
2.275
35
1.120
2.318
 
Fig.1 Distribution of Surface hardness
Fig.1 Distribution of Surface hardness
 
Fig.2 Distribution of Proportional limit for pure bending
Fig.2 Distribution of Proportional limit for pure bending
 
Fig.3 Distribution of Tensile strength
Fig.3 Distribution of Tensile strength
 
Fig.4 Correlation between Tensile strength and Rockwell hardness
Fig.4 Correlation between Tensile strength and Rockwell hardness
 
Table.7 Test machine properties
Machine type
4-point rotating bending
Motor
φ3-2p-0.75kw
Frequency
0~80Hz
 
 
Table.8 Test piece properties
Hardness HRC60
Geometry
 
Table.9 Parameter of Log-normal
Stress[GPa]
0.94
0.98
1.07
1.11
1.17
1.27
μ
17.93
17.57
15.7
15.03
14.75
12.99
σ
0.53
0.64
0.77
0.63
0.68
0.76
σ/μ
0.03
0.039
0.049
0.042
0.046
0.059
 
Table.10 Parameter of 2-parameter Weibull
Stress[GPa]
0.94
0.98
1.07
1.11
1.17
1.27
m
2.17
1.84
1.75
1.95
1.89
1.71
εεφση
77.80
54.90
9.40
4.45
3.30
0.63
 
Table.11 Parameter of 3-parameter Weibull
Stress[GPa]
0.94
0.98
1.07
1.11
1.17
1.27
m
1.5
η
56.47
48.41
6.24
3.57
2.31
0.5
γ
17.1800
5.9600
1.0880
0.8390
0.6900
0.0430
 
Table.12 Number of cycle to failures of rotating bending fatigue test for SUJ2 steel (HRC60)
No
Stress[GPa]
1.27
1.17
1.11
1.07
0.97
0.94
1
8.00×104
8.91×105
1.28×106
3.32×106
1.02×107
2.32×107
2
9.90×104
1.05×106
1.42×106
3.50×106
1.53×107
3.47×107
3
1.50×105
1.17×106
1.70×106

3.55×106
1.78×107
3.67×107
4
1.87×105
1.19×106
1.81×106
4.28×106
2.28×107
4.29×107
5
2.14×105
1.21×106
1.83×106
4.54×106
2.50×107
4.46×107
6
2.25×105
1.22×106
2.96×106
4.59×106
2.58×107
4.53×107
7
2.53×105
1.49×106
3.21×106
4.73×106
2.86×107
4.99×107
8
2.95×105
1.65×106
3.26×106
4.87×106
2.98×107
5.19×107
9
3.26×105
1.69×106
3.34×106
4.91×106
3.01×107
5.37×107
10
3.31×105
1.70×106
3.38×106
5.12×106
3.13×107
5.80×107
11
3.44×105
1.76×106
3.41×106
5.63×106
3.43×107
5.88×107
12
3.83×105
2.05×106
4.46×106
6.06×106
3.44×107
6.00×107
13
4.04×105
2.12×106
4.47×106
7.24×106
3.91×107
6.83×107
14
4.12×105
2.24×106
4.70×106
7.72×106
4.18×107
7.43×107
15
4.60×105
2.30×106
4.78×106
7.84×106
4.56×107
7.48×107
16
4.71×105
2.51×106
5.35×106
7.98×106
4.65×107
9.06×107
17
5.12×105
2.57×106
5.46×106
8.35×106
4.91×107
9.50×107
18
5.50×105
2.67×106
8.26×106
8.60×106
5.19×107
1.01×108
19
5.57×105
3.00×106
1.13×107
8.89×106
5.22×107
1.21×108
20
6.59×105
3.05×106
1.32×107
9.21×106
5.58×107
1.53×108
21
6.70×105
3.46×106
9.60×106
5.66×107
22
6.96×105
3.58×106
1.15×107
6.35×107
23
7.18×105
3.73×106
1.16×107
6.47×107
24
7.64×105
3.99×106
1.39×107
7.11×107
25
7.67×105
4.48×106
1.53×107
7.43×107
26
8.57×105
5.71×106
1.95×107
8.65×107
27
8.91×105
7.33×106
2.08×107
9.08×107
28
1.11×106
7.89×106
2.18×107
1.06×108
29
1.27×106
8.28×106
2.22×107
1.11×108
30
1.69×106
8.37×106
2.83×107
1.50×108
 
Fig. 5 Life distribution and Log-normal plot, and Log-normal-based P-S-N curve
Fig. 5 Life distribution and Log-normal plot, and Log-normal-based P-S-N curve
 
Fig. 6 Life distribution and Weibull plot, and 3-parameter Weibull-based P-S-N curve
Fig. 6 Life distribution and Weibull plot, and 3-parameter Weibull-based P-S-N curve
 
Fig. 7　Life distribution and Weibull plot, and 2-parameter Weibull-based P-S-N curve
Fig. 7　Life distribution and Weibull plot, and 2-parameter Weibull-based P-S-N curve
 
NON-METARIC INCLUSION
Table.13 Result of fracture surface[0.98GPa]
Depth[mm]
Diameter of inclusion[mm]
Kind of inclusion
0.11
19.5
MgO-CaO-Al2O3
0.03
6.7
TiN
0.08
12.1
TiN
0.47
18.4
CaO-Al2O3
0.03
9.7
TiN
0.07
8.7
TiN
 
Table.14 Result of fracture surface[1.07GPa]
Depth[mm]
Diameter of inclusion[mm]
Kind of inclusion
0.02
8.1
TiN
0.31
14.8
TiN
0.06
13.6
TiN
0.01
11.2
TiN

0.03
9.0
TiN
0.09
10.4
TiN
 
Table.15 Result of fracture surface[1.17GPa]
Depth[mm]
Diameter of inclusion[mm]
Kind of inclusion
0.08
15.3
TiN
0.02
14.9
CaO-Al2O3
0.01
6.7
TiN
0.36
19.5
MgO-CaO-Al2O3

0.28
14.3
TiN
 
Table.16 Result of fracture surface[1.27GPa]
Depth[mm]
Diameter of inclusion[mm]
Kind of inclusion
0.00
9.8
TiN
0.01
11.8
TiN
0.24
21.5
MgO-CaO-Al2O3
0.04
8.9
TiN

0.04
15.0
CaO-Al2O3
0.05
10.2
TiN
 
Fig.8 Fatigue failure of 4-point bending test specimen, SUJ2 HRC58‐62
Fig.8 Fatigue failure of 4-point bending test specimen, SUJ2 HRC58‐62
 
Fig. 9 TP1014 (CaO-MgO-Al2O3), TP6059 (TiN) inclusions and cracks
Fig. 9 TP1014 (CaO-MgO-Al2O3), TP6059 (TiN) inclusions and cracks
 
Fig. 10 TP6179 (Surface), TP6102 (CaO-Al2O3) inclusion and its crack
Fig. 10 TP6179 (Surface), TP6102 (CaO-Al2O3) inclusion and its crack
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