Improved composite high-chromium iron-cast roller
A technology of high-chromium cast iron and rolls, which is applied in the field of improved composite high-chromium cast iron rolls, which can solve the problems of reduced surface quality of rolled strips, thermal cracks in the working layer of high-chromium cast iron, easy peeling of oxide film, etc., and achieve rolling output The effect of improving, increasing service life and reducing large inclusions
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Embodiment 1
[0013] Example 1: According to the composition of the high chromium cast iron working layer, put the proportioned pig iron, scrap and high chromium cast iron into the intermediate frequency furnace for smelting. After smelting, the chemical composition of the original molten iron is analyzed, and then the corresponding alloy material is added. The composition obtained by smelting is C2.6%WT, Si0.9%, Mn0.7%, Ni1.2%, Cr15%, Mo1.5%, V0.25%, W0.6%, N0.05%, Al0. 1%, P≤0.04%, S≤0.04%, the rest is molten iron in the working layer of iron and impurities, centrifugal cast composite rolls. After heat treatment, the hardness of the working layer of the roll is 78HSD, the tensile strength of the working layer is 830Mpa, and the unevenness of the working layer hardness is less than 2HSD. After the rolling test, the grinding volume of each roll is less than 0.15mm, and the millimeter rolling volume is 50% higher than that of the roll with the original working layer of high chromium cast iron.
Embodiment 2
[0014] Embodiment 2: As in embodiment 1, the composition of the working layer of the roll is C2.8%, Si1.0%, Mn0.9%, Ni1.4%, Cr18%, Mo3.0%, V0.4%, W1.0 %, N0.07%, Al0.2%, P≤0.04%, S≤0.04%, the rest is iron and impurities. After the composite roll is heat-treated, the hardness of the working layer is 88HSD, the tensile strength of the working layer is 850Mpa, and the unevenness of the working layer hardness is less than 2.5HSD. After the rolling test, the grinding volume of each roll is less than 0.15mm, and the millimeter rolling volume is 60% higher than that of the roll with the original working layer of high chromium cast iron.
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