Workshop Technology
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is

More than 0.3 percent
Less than 0.1 percent
Anywhere between 0.1 to 1 percent
Less than 0.3 percent

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Workshop Technology
During hot working of metals

Grain structure of the metal is refined
Porosity of the metal is largely eliminated
All of the listed here
Mechanical properties are improved due to refinement of grains

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