Casting material for indefinite rollers with sleeve part and method for producing the same
AssigneeEisenwerk Sulzau-Werfen R. & E. Weinberger AG
InventorsMichael Windhager, Bernhard Feistritzer, Karl-Heinrich Schröder, Karl-Heinz Ziehenberger
Life of this patent
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Abstract
A method of the production and processing of alloyed casting material for a working part of an indefinite chill roll, a corresponding casting material and a composite indefinite chill roll incorporating the casting material. The method comprises providing a melt of a certain composition, casting the melt and subjecting the resultant body to a heat treatment. The composition of the melt is adjusted so as to afford a certain graphite and carbide distribution.
Claims27
A casting material for the working area of indefinite chill rolls comprising an alloy of, in wt-%,
- 2.0 to 3.5 carbon 1.0 to 2.0 silicon 0.5 to 2.0 manganese 1.0 to 3.0 chromium 3.5 to 4.9 nickel 0.20 to 2.9 molybdenum 0.002 to 0.65 aluminum and
- more than 0.5 to 5.9 vanadium, provided that the vanadium may in part be replaced, in an amount of less than 0.6 wt-%, by at least one of niobium and tantalum, the remainder being iron, accompanying elements and impurities related to the manufacturing process, wherein 1.0 to 3.0 vol-% of graphite is present in the form of particles with a distribution of more than 20 and less than 100 particles per mm2 of polished surface of the alloy.
A composite indefinite chill roll comprising a core part and a working or sleeve part surrounding the core part, wherein the core part is made of low-alloy cast iron and the working or sleeve part has a thickness of 10 to 150 mm and is made of a casting alloy with little tendency to adhere or weld to the rolling stock, has a Shore C hardness of 70 to 90 and comprises 1.0 to 2.5 vol-% of graphite, the latter being finely dispersed with a graphite particle count of more than 20 particles per mm2 of polished surface in a metallographic section, 8 to 35 vol-% of eutectic carbides, and 1 to 20 vol-% of uniformly distributed carbides of at least one of vanadium, niobium and tantalum, with the remainder primarily composed of martensite and constituents related to impurities and the manufacturing process, wherein said working or sleeve part comprises, in wt-%,
- 2.0 to 3.5 carbon 1.0 to 2.0 silicon 0.5 to 2.0 manganese 1.0 to 3.0 chromium 3.5 to 4.9 nickel 0.20 to 2.9 molybdenum 0.002 to 0.65 aluminum and
- 0.5 to 5.9 vanadium, provided that the vanadium may in part be replaced, in an amount of less than 0.6 wt-%, by at least one of niobium and tantalum, with the remainder being iron and impurities.
Dependencies are inferred from the claim text.