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Up to what temperatures are high alloy steels heated before treating them by oxygen cutting?

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in Casting-Forming-Welding II by (119k points)
Up to what temperatures are high alloy steels heated before treating them by oxygen cutting?

(a) 675°C

(b) 725°C

(c) 775°C

(d) 825°C

This question was addressed to me during an internship interview.

The query is from Oxygen Cutting topic in portion Welding and Related Processes of Casting-Forming-Welding II

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The correct choice is (a) 675°C

For explanation I would say: In oxygen cutting process, not all steels can be treated by this method. Only high alloy steels can be treated by this method. These steels need to be preheated before oxygen cutting. The temperature range up to which these steels are preheated is about 650°C to 700°C.

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