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Effects of Inclusions on Microstructure and Properties of Heat-Affected-Zone for HSLA SPFH 590

: Micro alloyed steels, often referred to as High-Strength Low-Alloy Steels (HSLA), are a family of materials strengthened by the elements niobium, vanadium and titanium added either singly or in combination While the various compositions of micro alloyed HSLA steels are vital to their unique properties, the processing techniques applied are of paramount importance in achieving maximum potential from a given composition. Strengthening by microalloying dramatically reduces the carbon content which greatly improves weldability and notch toughness The characteristics of inclusions in high strength low-carbon steels have been investigated by using the butt welding thermal simulation, the optical microscopy and scanning electron microscopy. In addition, the effects of inclusions on microstructure and properties of heat-affected-zone were studied.