MEDIUM-ALLOY STEEL OF ENHANCED MACHINABILITY

MEDIUM-ALLOY STEEL OF ENHANCED MACHINABILITY

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...

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Hauptverfasser: SIDOROV V.P, UGAROV A.A, SHLJAKHOV N.A, BOBYLEV M.V, LEKHTMAN A.A, FOMIN V.I, GONCHAROV V.V, KORSHIKOV S.P, GONTARUK E.I
Format: Patent
Sprache:eng ; rus
Schlagworte:
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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creator SIDOROV V.P
UGAROV A.A
SHLJAKHOV N.A
BOBYLEV M.V
LEKHTMAN A.A
FOMIN V.I
GONCHAROV V.V
KORSHIKOV S.P
GONTARUK E.I
description 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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subjects ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
title MEDIUM-ALLOY STEEL OF ENHANCED MACHINABILITY
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