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Low-aliquation high-speed steel roll and the preparing method
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A technology of high-speed steel and rolls, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of reducing the mechanical properties and wear resistance of rolls, loose rolls, etc., and achieve good bonding, reduced hardness drop, and production process easy effect
Inactive Publication Date: 2009-03-11
XI AN JIAOTONG UNIV
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Problems solved by technology
However, the addition of electromagnetic field stirring in centrifugal casting will easily make the roll loose and reduce the mechanical properties and wear resistance of the roll.
Method used
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Embodiment 1
[0042] The high-speed steel roll in this embodiment is cast by a horizontal centrifuge, and the outer diameter of the roll body is 650mm, roll body thickness 60mm, roll body length 800mm, total roll length 2760mm. The outer layer of high-speed steel is melted in a 1500 kg intermediate frequency induction furnace, and the inner layer of ductile iron is melted in a 5000 kg intermediate frequency induction furnace. The preparation process steps are:
[0043] (1) The smelting process of high-carbon high-speed steel molten steel for rollers is as follows:
[0044] ①Heat and melt ordinary steel scrap, pig iron, ferrochrome, ferromolybdenum, ferrotungsten and metal nickel plate, add ferrosilicon and ferromanganese after molten steel is melted, and add ferrovanadium before it is released from the furnace;
[0045] ② After adjusting the composition before the furnace, the temperature of the molten steel is raised to 1583°C, adding 0.18% of the weight of the molten steel to deoxidize ...
Embodiment 2
[0060] The high-speed steel roll in this embodiment is cast by a horizontal centrifuge, and the outer diameter of the roll body is 500mm, the thickness of the roll body is 55mm, the length of the roll body is 650mm, and the total length of the roll is 2510mm. The outer layer of high-speed steel is melted in an intermediate frequency induction furnace with a capacity of 1000 kg, and the inner layer of ductile iron is melted in an intermediate frequency induction furnace with a capacity of 5000 kg. The preparation process steps are:
[0061] (1) The smelting process of high-carbon high-speed steel molten steel for rollers is as follows:
[0062] ① Mix and heat ordinary steel scrap, recarburizer, ferrochrome, ferromolybdenum, ferrotungsten and metal nickel plate, add ferrosilicon and ferromanganese after molten steel is melted, and add ferrovanadium before it is released from the furnace;
[0063] ② After adjusting the composition before the furnace, the temperature of the molt...
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Abstract
The invention discloses a low segregation centrifugal casting high speed steel roll and the method. The roll is constituted by high speed steel roll body and alloy ductile ion roll core. The roll is produced by electric furnace. The high speed steel roll body is cast on horizontal centrifuge. As the liquid steel is cast iron powder suspension concentrate with 4%-6% by weight of liquid steel is added. After the liquid steel is cast glass waste sludge is added and then it is cooled by spraying water to form the model. Meanwhile the rotate speed of casting model is changed continuously and finally the ductile ion roll core is cast at the top statically. There is no obvious element segregation in radial section of high speed steel roll manufactured in invention. The macro hardness of roll is high and can achieve 63-65HRC. The difference of roll face hardness is less than 2HRC. The hardness fall of roll along the radial direction is small. The tensile strength of roll body is more than 600MPa and the elongation of roll core is more than 3%. The service life is improved by 5-8 times than high chromium cast iron roll and is improved by 35%-48% than common high speed steel roll. It can decrease the producing cost of rolling steel and prolong roll changing period.
Description
technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a method for preparing metal rolls used for rolling steel in various rolling mills, in particular to a method for preparing low-segregation centrifugal casting high-speed steel rolls. Background technique [0002] Rolls are the main consumable spare parts in steel rolling production. The quality of rolls directly affects the operating rate of the rolling mill, the surface quality of rolled materials and the cost of steel rolling production. Improving and improving the quality of rolls is an urgent task in steel rolling production. Currently commonly used roll materials include high-nickel-chromium infinitely chilled cast iron, alloy ductile iron, high-chromium white cast iron, bainite ductile iron and semi-steel, etc., all of which have the disadvantages of low high-temperature hardness and poor high-temperature wear resistance. Because high-speed steel contains more alloying...
Claims
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Application Information
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