Method of heat treating metal

Details Method of heat treating metal Method of heat treating metal

C - Chemistry, Metallurgy

21

D

148/37.4

C21D 1/42 (2006.01)

Patent

CA 1190457

ABSTRACT OF THE DISCLOSURE The disclosure describes a method of achieving a hardness of no more than 23 on the Rockwell "C" hardness scale in the heat-affected zone in base metal surrounding a weld. The method includes the steps of preheating the base metal prior to welding; maintaining a sufficient interpass temperature to retard the cooling rate of the weld area to a sufficient degree; welding while maintaining the interpass temperature; cooling the weld and base metal below Ms; first postheating the weld and base metal; cooling the weld and base metal; and second postheating by local application of induction heating to the weld and adjacent base metal at a subcritical temperature of at least sub- stantially 1310°F for at least substantially 350 seconds.

462087

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