No abstract

No abstract

No abstract

Ultrahigh strength hot rolled microalloyed steels of yield strength 690 and 760 MPa with ferrite -bainite microstructure have been developed. Impact toughness of y135 J at 240uC and a ductile -brittle transition temperature of less than approximately 270uC have been obtained in steels of gauge y3 mm. The attractive strength -toughness combination was achieved by applying microalloying concepts and controlled rolling in an interactive manner. Alloy design aspects are qualitatively described in relation to the contributions of solute, grain size, precipitates, and microstructural constituents.MST/4829

No abstract