Lukens LT-75 is a carbon-manganese-silicon steel of flange and firebox quality having good impact properties for low temperature applications. It is supplied in two grades; LT-75N and LT-75QT. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: CS-20. Producer or source: Lukens Steel Company.