DEVICE AND METHOD FOR CHARGING ADDITIVE INTO MOLTEN STEEL

PROBLEM TO BE SOLVED: To provide a device for charging an additive with which the improvement and the stability in the yield of a free-cutting steel can be obtained by charging the additive into molten steel at a low speed and a fixed speed. SOLUTION: In the charging device for additive charging Pb...

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Bibliographic Details
Main Authors OGAWA TAKAHIRO, OKAMURA KIYOTAKA
Format Patent
LanguageEnglish
Published 27.01.2005
Edition7
Subjects
CASTING
CASTING OF METALS
CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
CHEMISTRY
METALLURGY
METALLURGY OF IRON
PERFORMING OPERATIONS
POWDER METALLURGY
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL
TRANSPORTING
TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Summary:PROBLEM TO BE SOLVED: To provide a device for charging an additive with which the improvement and the stability in the yield of a free-cutting steel can be obtained by charging the additive into molten steel at a low speed and a fixed speed. SOLUTION: In the charging device for additive charging Pb grains 24 into the molten steel 19 in a ladle 17, this device is provided with a weighing hopper 3 for weighing the Pb grains, a rotary valve 8 for feeding out the Pb grains 24 stored in this weighing hopper 3 and a butterfly valve 11 arranged below the rotary valve 8 and changeable to the opening/closing in the pipe line for fed-out Pb grains 24 and constituted so that the size of a gap between the tip part of the blade of a rotor 6 in the rotary valve 8 and the inner surface of a casing for putting the rotor 6 becomes 2-10 times of the grain diameter of the Pb grains. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20030190193