METHOD OF PRODUCTION OF CONTINUOUSLY CAST BLANK OF BARS FROM BORON-CONTAINING STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH FASTENERS

• Main Authors: KULAPOV A.N, BOBYLEV M.V, MAJSTRENKO V.V, LEKHTMAN A.A, FOMIN V.I, ANTONOVA Z.A, ZAKIROV D.M, GONTARUK E.I, STEPANOV N.V
• Format: Patent
• Language: English; Russian
• Published: 10.10.2004
• Edition: 7
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

FIELD: metallurgy; production of bars from boron-containing steel for cold die forging of fasteners of complex configuration. ^ SUBSTANCE: proposed method includes making steel of the following composition, mass-%: carbon, 0.08-0.34; manganese, 0.90-1.4; silicon, 0.01-0.15; boron, 0.0005-0.0050; chromium, 0.005-0.40; vanadium, 0.005-0.08; aluminum, 0.02-0.06; titanium, 0.01-0.04; sulfur, 0.005-0.020; nitrogen, 0.005-0.015; calcium, 0.001-0.010; the remainder being iron and unavoidable admixtures. Ti/48+Al/27-N/1>=0.6.10-3; Mn+5.0C>=2.0; Ca/S>=0.065; then melt is tapped and treatment of steel is performed beyond furnace when steel is alloyed with titanium and boron in vacuumator and then continuous teeming of steel is performed followed by hot rolling and cooling. Proposed method excludes additional spheroidizing annealing . ^ EFFECT: improved hardenability of steel. ^ 4 cl, 1 ex