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| Q. |
The surface hardness that can be obtained by nitriding is generally in the range |
| A. | 600 to 800 VPN |
| B. | Strength and hardness of steel is increased |
| C. | 400 to 600 VPN |
| D. | 1000 to 1100 VPN |
| E. | Below 400 VPN |
| Answer» D. 1000 to 1100 VPN | |
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