Q. The percentage of carbon that must be present in steel before it can be hardened noticeably is (Solved)
1. 0.20 percent
2. 0.30 percent
3. 0.70 percent
4. 0.10 percent
5. 0.05 percent
- a. 0.20 percent
1. 0.20 percent
2. 0.30 percent
3. 0.70 percent
4. 0.10 percent
5. 0.05 percent