In order to meet the increased heat input in welding for improved productivity
of shipbuilding, JFE Steel developed “JFE EWEL,” a new technology
for improving HAZ toughness in high heat input welding. Technical factors of
JFE EWEL include the control of grain size in HAZ through optimization of TiN,
control of microstructure in HAZ grain through advanced microalloying technology,
and optimized alloy design through application of Super-OLAC. By applying JFE
EWEL to the steel used in shipbuilding, such as YS390N/mm2 class heavy section
plate for container ships, low-temperature service steel plate for LPG carriers,
and YS355N/mm2 class F-grade plate for hull structures, excellent properties
in both base plates and welded joints for high heat input welding were achieved. |
