Rolls for metal shaping
AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorsKenneth Donald Lakeland, Graham Leonard Fraser Powell, Tommy Nylen
Life of this patent
Estimating the term…
Abstract
Rolls for metal shaping have at least a peripheral surface of an iron-based Fe—B or Fe—B—C cast alloy having from 1 to 20 wt % chromium; from 0.5 to 3 wt % boron; up to 1.0 wt % carbon; or higher carbon if substantial amounts of strong carbide forming elements such as Mo, V, Ti, W and Nb are present; optional alloying additions including the Mo, V, Ti, W and Nb and also including Si, Al, Mn, Ni and Cu; and, apart from incidental impurities, a balance of Fe.
Claims21
A roll, for the hot rolling or casting of steel products, wherein the roll has at least a peripheral surface layer, of not less than 25 mm thick, cast from an iron-base alloy, and wherein said iron-base alloy consists essentially of from 8 to 18 wt % chromium, 0.5 to 2.5 wt % boron, 0 to 0.3 wt % carbon, and a balance apart from incidental impurities of iron, wherein said cast iron-base alloy exhibits a high level of thermal shock resistance and wear resistance enabling extended use of the roll in hot rolling of steel products.
A roll, for the hot rolling or casting of steel products, wherein the roll has at least a peripheral surface layer, of not less than 25 mm thick, cast from an iron base alloy consisting essentially of from 8 to 18 wt % chromium, 0.5 to 2.5 wt % boron, 0 to 0.6 wt % carbon, at least one of nickel and molybdenum, and a balance apart from incidental impurities of iron, wherein the level of nickel where present is from 0.2 to 2 wt % and the level of molybdenum where present is from 0.5 to 5 wt %, wherein said cast iron-base alloy exhibits a high level of thermal shock resistance and wear resistance enabling extended use of the roll in hot rolling of steel products.
A roll, for the hot rolling or casting of steel products, wherein the roll has at least a peripheral surface layer, of not less than 25 mm thick, cast from an iron-base alloy consisting essentially of from 8 to 18 wt % chromium 0.5 to 2.5 wt % boron, 0 to 0.6 wt % carbon, at least one alloying element addition for enhancement of oxidation resistance and hardenability, and a balance apart from incidental impurities of iron, and wherein said at least one alloying element addition is selected from:
- aluminium at up to 0.2 wt %,
- copper at up to 3 wt %,
- manganese at from 0.2 to 2 wt %,
- nickel at from 0.2 to 2 wt %,
- molybdenum at from 0.5 to 5 wt %, and
- silicon at from 0.5 to 3 wt %,
- wherein said cast iron-base alloy, in addition to exhibiting oxidation resistance and hardenability enabling extended use in hot rolling of steel products, exhibits a high level of thermal shock resistance and wear resistance enabling extended use of the roll in hot rolling of steel products.
A roll, for the hot rolling or casting of steel products, wherein the roll has at least a peripheral surface layer, of not less than 25 mm thick, cast from an iron-base alloy consisting essentially of from 8 to 18 wt % chromium, 0.5 to 2.5 wt % boron, 0 to 0.6 wt % carbon, at least one alloying addition forming intermetallic particles selected from carbide, boride and carbo-boride for wear resistance enhancement, and a balance apart from incidental impurities of iron, and wherein said at least one alloying addition is selected from:
- molybdenum at up to 5 wt %,
- niobium at up to 6 wt %,
- titanium at up to 5 wt %,
- vanadium at up to 8 wt %, and
- tungsten at up to 7 wt %,
- wherein said cast iron-base alloy, in addition to exhibiting enhanced wear resistance enabling extended use in hot rolling of steel products, exhibits a high level of thermal shock resistance and wear resistance enabling extended use of the roll in hot rolling of steel products.
Dependencies are inferred from the claim text.