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Q. |
Which of the following is not a type of oil- hardening steel? |
A. | o1 |
B. | o2 |
C. | o6 |
D. | o9 |
Answer» D. o9 | |
Explanation: oil hardening steels are a group of cold working tool steels. this group consists of o1 (0.9% c, 1% mn, 0.5% cr), |
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