I do not know what modern tubing it applies to but Reynolds mandated that you must only use silver soldering for 753 because heating it more than 1200 degrees damaged the heat treatment and weakened the tubes.
@bq started
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I do not know what modern tubing it applies to but Reynolds mandated that you must only use silver soldering for 753 because heating it more than 1200 degrees damaged the heat treatment and weakened the tubes.