contains titanium with a content of between 0 05 and 0 1 this element allows the mechanical properties to be substantially improved by a precipitation effect during the rolling and cooling steps it does not increase the hot hardness because of its moderate content its content is limited to 0 1 in order to avoid degrading the impact strength properties the hot hardness and the bendability the composition may also contain phosphorus with a content of less than 0 05 as beyond this it would pose segregation problems during continuous casting the composition also contains aluminum with a content of less than 0 07 which is introduced when killing the steel during smelting in the steelworks by way of nonlimiting example and so as to better illustrate the invention a grade of steel was smelted its composition is given in the table below the balance of the composition consists of iron and inevitable impurities resulting from the smelting three specimens were prepared from grade a by rolling them at 860 u00b0 c and then subjecting them to different thermomechanical pathways the cooling rates between 800 and 700 u00b0 c and the coiling temperature were varied so as to bring out the structural differences obtained next the mechanical properties of the steels obtained were measured the results are given in the table below the microstructure of trial 1 according to the invention was of bainite martensite type while the microstructure of trials 2 and 3 was of ferrite bainite type the table shows that a cooling rate between 800 and 700 u00b0 c of less than 50 u00b0 c s causes ferrite to be present in a proportion of greater than 5 titanium then precipitates in.