Patent ID: 8221562

Claim:
A method of manufacturing a steel product, comprising: providing a steel composition comprising boron and titanium; casting the steel composition into a slab having a thickness between about 25 and 150 mm, wherein said steel composition and casting parameters for casting the steel composition are selected to produce a cast steel substantially free from cracks or other structural defects, wherein the slab has a cast composition comprising: about 0.23 to 0.30 wt. % carbon; about 0.001 to 0.005 wt. % boron, said about 0.001 to 0.005 wt. % boron being free boron; about 0.010 to 0.050 wt. % titanium; about 1.15 to 1.50 wt. % manganese; less than about 0.35 wt. % silicon; a Ti/N ratio greater than about 2.9; wherein the amount of each element is provided based upon the total weight of the cast composition; and wherein said selected casting parameters to produce a cast steel substantially free from cracks or other structural defects comprise casting the steel composition into a slab at a rate of up to about 4.3 m/min.