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Contact and bending endurance limits
Heat treatment
| Tooth hardness
| Gear material
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| case
| core and root
| Normalizing, martempering
| Brinell 180 to 350
| Carbon and alloy steels, such as 45 (0.45C), 40X (0.40C-Cr), 40XH (0.40C-Cr-Ni), 50XH (0.50C-Cr-Ni), and 35XM (0.35C-Cr-Mo)
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| Full hardening
| Rockwell C, 40 to 55
| Carbon and alloy steels, such as 45 (0.45C), 40X (0.40C-Cr), 40XH (0.40C-Cr-Ni), and 35XM (0.35C-Cr-Mo)
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| Surface hardening
| Rockwell C,
40 to 58
| Rockwell C, 25 to 35
| Alloy steels, such as 40X (0.40C-Cr), 40XH (0.40C-Cr-Ni), 50XH (0.50C-Cr-Ni), and 35XM (0.35C-Cr-Mo)
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| Case hardening
| Rockwell C,
54 to 64
| Rockwell C, 30 to 45
| Alloy steels, such as 20XH2M (0.20C-Cr-2Ni-Mo)
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| Nitriding
| Rockwell C,
50 to 60
| Rockwell C, 24 to 40
| Alloy steels, such as 40XH2MA (0.40C-Cr-2Ni-Mo, quality)
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| (of tooth core)
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Determine the base number of stress cycles for the pinion and gear . For this purpose we use table 2.2.
Table 2.2
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