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2 237 728

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Application

2003110867/02, 2003-04-16

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Start date

2003-04-16

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Actual filing date

2003-04-16

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Published

2004-10-10

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Inventor

Bobylev M.V.Zakirov D.M.Kulapov A.N.Stepanov N.V.Antonova Z.A.Lekhtman A.A.Gontaruk E.I.Majstrenko V.V.Fomin V.I.

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Holder

Obshchestvo S Ogranichennoj Otvetstvennost'Ju Inso"

METHOD OF PRODUCTION OF CONTINUOUSLY CAST BLANK OF BARS FROM BORON-CONTAINING STEEL FOR COLD DIE FORGING OF HIGH-STRENGTH FASTENERS Russian patent published in 2004 - IPC

Abstract RU 2237728 C1

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

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RU 2 237 728 C1

Authors

Bobylev M.V.

Zakirov D.M.

Kulapov A.N.

Stepanov N.V.

Antonova Z.A.

Lekhtman A.A.

Gontaruk E.I.

Majstrenko V.V.

Fomin V.I.

Dates

2004-10-10—Published

2003-04-16—Filed