The aim of the paper was to investigate helical rolling parameters (a number passes) for microstructural modification and low-temperature impact toughness improvement 09Mn2Si High Strength Low-Alloyed (HSLA) steel. In order achieve this purpose, work spent crack initiation propagation analyzed compared with patterns fracture surfaces. microstructure values were presented in temperature range fr...

Q690E high strength low alloy (HSLA) steel plays an important role in offshore structures. In addition, underwater local cavity welding (ULCW) technique was widely used to repair important offshore constructions. However, the high cooling rate of ULCW joints results in bad welding quality compared with underwater dry welding (UDW) joints. Q690E high strength low alloy steels were welded by mult...

The effect of different austenite grain size and different cooling rates on the austenite to ferrite transformation temperature and different ferrite morphologies in one Nb-microalloyed (HSLA) steel has been investigated. Three different austenite grain sizes were selected and cooled at two different cooling rates for obtaining austenite to ferrite transformation temperature. Moreover, samples ...