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High Strength Offshore Steel with Excellent Weldability

A new high strength low alloy (HSLA) steel in 370MPa yield strength grade with low susceptivity to weld cold cracking has been developed for offshore engineering. The microstructure feature of base steel and weld heat affected zone (HAZ) has been investigated. The systematic studies showed that the developed steel exhibited high strength(yield strength≥370MPa)、high impact toughness and excellent weldability. The complex inclusions containing fine oxides in HAZ promoted the acicular ferrite formation in weld thermal cycle and resulted in desired mechanical properties of HAZ.