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2 238 335

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Application

2003110868/02, 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

2004-10-20

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Inventor

Bobylev M.V.Zakirov D.M.Kulapov A.N.Stepanov N.V.Antonova Z.A.Majstrenko V.V.Peshev A.D.Lamukhin A.M.Vodovozova G.S.Ziborov A.V.Lutsenko A.N.Ronzhina L.N.

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Holder

Obshchestvo S Ogranichennoj Otvetstvennost'Ju Inso"

METHOD FOR PRODUCING OF SPHEROIDIZED ROLLED BARS FROM BORON STEEL FOR COLD BULK PRESSING OF HIGH-STRENGTH FASTENING PARTS Russian patent published in 2004 - IPC

Abstract RU 2238335 C1

FIELD: metallurgy, in particular, production of compound-shaped high-strength fastening parts.

SUBSTANCE: method involves melting steel in electric furnace; processing beyond furnace; pouring in casting mold while protecting metal flow; providing hot rolling of ingot for producing of blank, with following controlled rolling; winding rolled product into rolls; providing cold gauging deformation process at deformation extent of 20-25% and spheroidizing annealing process including high-speed inductive heating of cold-deformed metal in intercritical temperature range, with following controlled cooling within temperature range of 650-7300C at cooling rate of 0.5-1.00C and further cooling in thermal chamber at temperature of 100-2000C; melting steel containing following components used in the following ratio, wt%: carbon 0.17-0.26; manganese 0.90-1.30; silicon 0.01-0.20; chromium 0.005-0.35; boron 0.0005-0.0050; niobium 0.001-0.02; aluminum 0.02-0.06; titanium 0.01-0.04; nitrogen 0.005-0.015, with following ratio being met: N(10Ti+Al)≤0.039; (10B-0.01C)N≥1.80. Steel microalloying with niobium inhibits steel recrystallization processes at rolling final temperature of 950-1,0000C.

EFFECT: increased efficiency by controlled rolling on existing equipment and provision for fine-grained structure.

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RU 2 238 335 C1

Authors

Bobylev M.V.

Zakirov D.M.

Kulapov A.N.

Stepanov N.V.

Antonova Z.A.

Majstrenko V.V.

Peshev A.D.

Lamukhin A.M.

Vodovozova G.S.

Ziborov A.V.

Lutsenko A.N.

Ronzhina L.N.

Dates

2004-10-20—Published

2003-04-16—Filed

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