MANUFACTURE OF LONG LARGE-SIZED FORGED PRODUCT

PURPOSE:To obtain an ingot and cast product that do not contain eutectic Nb carbide and precipitated crystals by limiting height/diameter ratio of an ingot of alloy steel that contain specified quantity of Nb, Cr and making the size in the direction of height larger than the size of radial direction...

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Bibliographic Details
Main Authors MAENO SHIGEO, KODAMA HIDEYO, MORISADA TOKIO, AKAHORI KIMIHIKO
Format Patent
LanguageEnglish
Published 11.06.1984
Subjects
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
FORGE FURNACES
FORGING
HAMMERING
MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL
METALLURGY
PERFORMING OPERATIONS
PRESSING METAL
PUNCHING METAL
RIVETING
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:PURPOSE:To obtain an ingot and cast product that do not contain eutectic Nb carbide and precipitated crystals by limiting height/diameter ratio of an ingot of alloy steel that contain specified quantity of Nb, Cr and making the size in the direction of height larger than the size of radial direction by forging the ingot. CONSTITUTION:Molten metal of alloy steel containing 0.08-0.25% C, 0.02- 0.15% Nb, 9-12% Cr, 80% <=Fe in wt% is casted in a mold in which H/D is <=1 where H is height excluding the feeder head and D is diameter at the position of height 1/2 H, and solidified. The ingot obtained is forged by applying pressure in radial direction to make the size in the direction of height of the casting larger than the size in radial direction. By this way, a long, large-sized forged product of high mechanical property such as a rotor shaft of a steam turbine can be obtained.
Bibliography:Application Number: JP19820209363