A hot rolled dual phase steel for a line pipe, consisting of: carbon in an amount of 0.05% by weight to 0.12 wt%; niobium in an amount of 0.005 wt% to 0.03 wt%; titanium in an amount of 0.005 wt% to 0.02 wt%; nitrogen in an amount of 0.001 wt% to 0.01 wt%; manganese in an amount of 0.5 wt% to 2.0 wt%; silicon in an amount of 0.01 wt% to 0.5 wt%; aluminium in an amount of up to 0.1 wt%; nickel in an amount of up to 1 wt%; optionally, boron in an amount of up to 0.002 wt%; optionally, calcium in an amount of up to 0.01 wt%; optionally, rare-earth metals in an amount of up to 0.02 wt%; optionally, magnesium in an amount of up to 0.006 wt%; optionally, copper in an amount of up to 0.2 wt%; optionally, zirconium in an amount of less than 0.03 wt%; optionally hafnium in an amount of less than 0.03 wt%; optionally tantalum in an amount of less than 0.03 wt%; phosphorus in an amount of less than 0.015 wt%; sulphur in an amount of less than 0.01 wt% a total of molybdenum, chromium, vanadium and copper is 0.20 wt% or less; and the balance iron and inevitable impurities; wherein Pcm, calculated in accordance with the formula Pcm = C + Si / 30 + Mn + Cu + Cr / 20 + Ni / 60 + Mo / 15 + V / 10 + 5 ⁢ B is less than 0.220; and wherein the steel has tensile strength that exceeds 500 MPa, and/or a minimum yield strength of at least 400 MPa and/or a minimum uniform elongation that exceeds 8%, and/or a yield ratio of 0.90 or less, and/or a toughness of more than 120 J in Charpy-V-Notch test at -12°C; a microstructure consisting of ferrite as a first phase, and; 10% by volume - 90% by volume of a second phase comprising one or more constituents selected from the group consisting of carbide, pearlite, martensite, lower bainite, granular bainite, upper bainite, and degenerate upper bainite; a solute carbon content in the first phase being 0.01 wt% or less, and a solute nitrogen content in the ferrite phase being less than 0.01 wt%. carbon in an amount of 0.05% by weight to 0.12 wt%; niobium in an amount of 0.005 wt% to 0.03 wt%; titanium in an amount of 0.005 wt% to 0.02 wt%; nitrogen in an amount of 0.001 wt% to 0.01 wt%; manganese in an amount of 0.5 wt% to 2.0 wt%; silicon in an amount of 0.01 wt% to 0.5 wt%; aluminium in an amount of up to 0.1 wt%; nickel in an amount of up to 1 wt%; optionally, boron in an amount of up to 0.002 wt%; optionally, calcium in an amount of up to 0.01 wt%; optionally, rare-earth metals in an amount of up to 0.02 wt%; optionally, magnesium in an amount of up to 0.006 wt%; optionally, copper in an amount of up to 0.2 wt%; optionally, zirconium in an amount of less than 0.03 wt%; optionally hafnium in an amount of less than 0.03 wt%; optionally tantalum in an amount of less than 0.03 wt%; phosphorus in an amount of less than 0.015 wt%; sulphur in an amount of less than 0.01 wt% a total of molybdenum, chromium, vanadium and copper is 0.20 wt% or less; and the balance iron and inevitable impurities; wherein Pcm, calculated in accordance with the formula Pcm = C + Si / 30 + Mn + Cu + Cr / 20 + Ni / 60 + Mo / 15 + V / 10 + 5 ⁢ B is less than 0.220; and wherein the steel has tensile strength that exceeds 500 MPa, and/or a minimum yield strength of at least 400 MPa and/or a minimum uniform elongation that exceeds 8%, and/or a yield ratio of 0.90 or less, and/or a toughness of more than 120 J in Charpy-V-Notch test at -12°C; a microstructure consisting of ferrite as a first phase, and; 10% by volume - 90% by volume of a second phase comprising one or more constituents selected from the group consisting of carbide, pearlite, martensite, lower bainite, granular bainite, upper bainite, and degenerate upper bainite; a solute carbon content in the first phase being 0.01 wt% or less, and a solute nitrogen content in the ferrite phase being less than 0.01 wt%.