Per: mohammad hizombor (khouzestan oxinsteel co.), Reza Abdideh (khouzestan oxinsteel co.), Salman Hamidi (khouzestan oxinsteel co.), Ebrahim Yaghout (khouzestan oxinsteel co.), Amin Asiaban (khouzestan oxinsteel co.)
Abstract:
S460Q Carbon and Low-alloy High-strength Steel Plate possesses good weld ability features, high resistance to brittle cracking and good cold-forming properties. It is typically used for welded structures in shipbuilding and machine-building and for construction of bridges, steel structures and wind generators supports. S460Q structural steel was produced according to European standard structural steel of EN 10025-6. The steel is available in either Quenched and Tempered or thermo-mechanically rolled with Tempering condition. In this research, it has been tried to investigate and compare microstructural variations and mechanical properties of S460Q steel plates produced by two methods of hot rolling operation, including “As hot rolled with Quenching and Tempering” and “Thermo-mechanical control processing (temperature controlled rolling (TCR) with accelerated cooling (ACC)) with Tempering”. For this purpose, two slabs of S460Q steel grades were both provided from the same heat and dimensions then converted to plates with similar dimensions by two mentioned methods. Results were analyzed by mechanical tests and microstructures observations. Results of mechanical tests show that plates produced by two mentioned methods were matched with EN10025-6. Plate Tensile properties produced by TMCP with tempering were lower than as hot rolled with Quenched-Tempered method. moreover, the toughness in Quenched-Tempered method has been increased in comparison to the other one. Besides that metallugraphical observations repersent microstructure with bondings and abnormal ferrite grain growth in Plate produced by TMCP+Tempering method.
