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2 261 934

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Application

2004117831/02, 2004-06-11

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Start date

2004-06-11

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Actual filing date

2004-06-11

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Published

2005-10-10

(72)

Inventor

Ugarov A.A.Bobylev M.V.Shljakhov N.A.Gontaruk E.I.Lekhtman A.A.Fomin V.I.Sidorov V.P.Korshikov S.P.Goncharov V.V.

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Ehlektrometallurgicheskij Kombinat"

MEDIUM-ALLOY STEEL OF ENHANCED MACHINABILITY Russian patent published in 2005 - IPC

Abstract RU 2261934 C1

FIELD: steels used for manufacture of heavily-loaded gears of automobile gear-boxes.

SUBSTANCE: proposed medium-alloy high machinability steel contains the following constituents, mass-%: carbon, 0.170.23; manganese, 0.65-0.95; silicon, 0.17-0.37; chromium, 0.35-0.65; nickel, 0.40-0.75; molybdenum, 0.15-0.25; sulfur, 0.020-0.040; phosphorus, 0.001-0.035; niobium, 0.005-0.02; vanadium, 0.005-0.08; calcium, 0.001-0.010; oxygen, 0.001-0.015; the remainder being iron and unavoidable admixtures. Oxygen-to-calcium ratio and calcium-to-sulfur ratio are determined as follows: oxygen/calcium =1-4.5 and calcium/sulfur ≥0.065. Steel contains the following admixtures, mass-%: copper, no more than 0.25; arsenic, no more than 0.08; nitrogen, no more than 0.015; non-metallic inclusions have double-layer structure - sulfide with oxide envelope.

EFFECT: enhanced machinability of steel; full hardenability of rolled stock up to 50 mm in diameter.

3 cl, 2 tbl, 1 ex

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RU 2 261 934 C1

Authors

Ugarov A.A.

Bobylev M.V.

Shljakhov N.A.

Gontaruk E.I.

Lekhtman A.A.

Fomin V.I.

Sidorov V.P.

Korshikov S.P.

Goncharov V.V.

Dates

2005-10-10—Published

2004-06-11—Filed