Method for producing titanium-bearing microalloyed high-strength low-alloy steel

摘要: A composition and method of making a high-strength low-alloy hot-rolled steel sheet, strip, or plate bearing titanium as the principal only microalloy strengthening element. The is substantially ferritic has microstructure that at least 20% acicular ferrite. minimum yield strength 345 MPa (50 ksi) even over 621 (90 adding lone element for strengthening, with elongation 15% more. Addition vanadium, niobium, combination thereof can result in strengths exceeding ksi). Effective content, being content not form nitrides, oxides, sulfides, range 0.01 to 0.12% by weight. manufacturing process includes continuously casting thin slab reducing thickness using thermomechanical controlled processing, including dynamic recrystallization rolling.