Dear friend ,
AS per code if u refer TWI-3.2 swnior welding inspector
UCT= Annealing ,Normalising And Hardening
Normally heating 50 degree beyond its A3 or Upeer Critical Temperature then soaked for 1 hour for every 25 mm of thickenss..
LCT= Tempering,Stress Relieving and Pre-heating...
The temperature between 200 degree to 650 degree..
Regards
shankar
Welding Inspector
saudi arabia
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