Abstract: An interrupted normalization heat treatment process for ferritic alloy steel that includes the steps of rapidly cooling at least the outer surfaces of the steel from a temperature above the Ac.sub.3, temperature to a temperature below the Ar.sub.1, temperature and during subsequent air cooling to room temperature reheating the outside surfaces of the ferritic alloy steel back above the Ar.sub.1, temperature by bleed back heat from the steel, tempering the air cooled workpiece, and forming an as interrupting normalized workpiece having substantially bainitic structures.

Abstract: The invention relates to a process for improving the cold formability of hot rolled or cold rolled heat-treatable steels.The characterizing feature of the invention is that with a composition of (in % by weight)0.32-0.54% C0.05-0.40% Mn0.41-1.5% Si0.02-0.15% Almaximum 0.05% Crmaximum 0.05% Smaximum 0.03% Pmaximum 0.02% Nresidue iron and unavoidable impuritiesprior to the final cold forming and quench hardening with subsequent tempering is performed for at least 15 hours at temperatures between 620.degree. and 680.degree. C. to graphitization, while with a composition of0.55-1.3% C0.20-0.30% Mn0.41-0.90% Si0.02-0.15% Almaximum 0.05% Crmaximum 0.010% Smaximum 0.03% Pmaximum 0.02% Nresidue iron and unavoidable impuritiessaid annealing lasts for at least 8 hours.

Abstract: A mining and construction bit body is composed of a Mn-B steel alloy composition. The alloy content of the composition in percents by weight includes: carbon, 0.33-0.38; manganese, 1.10-1.35; boron, 0.0005 minimum; silicon 0.15-0.30; sulfur, 0.045 maximum; and phosphorus, 0.035 maximum. The composition has a minimum hardenability of 47 Rockwell C at the Jominy 6/16 position and a maximum as-rolled hardness of 22 Rockwell C such that without anneal the composition meets hardenability and machinability requirements that make it useful for fabricating mining and construction bit bodies of all sizes.