A New Proposal of HAZ Toughness Evaluation Method: Part 2 — HAZ Toughness Formulation by Chemical Compositions

摘要

This paper details an investigation into the measurement and the prediction of heat-affected zone (HAZ) toughness for construction structural steels. The HAZ toughness was examined using both single-layer and multilayer welded joints, and correlated to the chemical compositions of the steels used. From the series of the tests, the parameter, f_(HAZ), was derived to assess approximately whether a steel plate has adequate HAZ toughness. The condition is shown below. f_(HAZ) ≤ 0.577 for _vE_(273) (single layer) ≥ 30J, _vE_(273)(multilayer) ≥ 70J f_(HAZ) ≤ 0.632 for _vE_(273)(single layer) ≥ 12J, _vE_(273)(multilayer) ≥ 27J f_(HAZ) = C +Mn/8 + 6 (P + S) + 12 N -4 Ti (Note: The content of Ti should be considered as 0 when it is equal to or less than 0.005 mass-%.)