1.

Hard steel contains

Answer» <html><body><p> 0.5 to 1.5 per cent carbon</p><br/><br/><p>The term hardened steel is often used for a medium or <a href="https://interviewquestions.tuteehub.com/tag/high-479925" style="font-weight:bold;" target="_blank" title="Click to know more about HIGH">HIGH</a> carbon steel that has been given the heat treatments of quenching followed by tempering. The quenching results in the formation of metastable martensite, the fraction of which is reduced to the desired amount during tempering. This is the most common <a href="https://interviewquestions.tuteehub.com/tag/state-21805" style="font-weight:bold;" target="_blank" title="Click to know more about STATE">STATE</a> for finished articles such as tools and <a href="https://interviewquestions.tuteehub.com/tag/machine-550312" style="font-weight:bold;" target="_blank" title="Click to know more about MACHINE">MACHINE</a> parts. In contrast, the same steel composition in annealed state will be softer as <a href="https://interviewquestions.tuteehub.com/tag/required-1185621" style="font-weight:bold;" target="_blank" title="Click to know more about REQUIRED">REQUIRED</a> for forming and machining. Carbon steels which can successfully <a href="https://interviewquestions.tuteehub.com/tag/undergo-1436536" style="font-weight:bold;" target="_blank" title="Click to know more about UNDERGO">UNDERGO</a> heat-treatment have carbon content in the range of 0.30–1.70% by weight. Trace impurities of various other elements can have a significant effect on the quality of the resulting steel. Trace amounts of sulfur in particular make the steel red-short.</p></body></html>


Discussion

No Comment Found

Related InterviewSolutions