Stainless alloys are in the range of 100 C from the lowest to the highest. They melt in the range of 1400 - 1500 C. Carbon steel is in the same temperature range.
Would guess that the person is new to the art and has not mastered the use of smaller mandrels. Perhaps the use of 3/32 or 1/8 would help to get the technique down before moving to thinner and more difficult to work with mandrel sizes
Agree with the other statements that is it "user error".....
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