Tool steel roller for rolling medium-thickness plate and manufacturing method thereof
A manufacturing method and tool steel technology, which is applied in the manufacture of tools, rolls, metal rolling, etc., can solve the problems of easy thermal cracking, insufficient wear resistance of rolls, and poor surface quality, so as to avoid cracking and increase the millimetric rolling capacity , Improve the effect of wear resistance
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[0022] Example 1:
[0023] A tool steel roll for rolling medium and heavy plates, including the core and roll neck of ductile iron and the outer layer of tool steel. The alloy composition and weight percentage of the outer layer of tool steel are designed to be: C1.60~1.80 %, Si0.90~1.00%, Mn0.80~1.00%, Cr14.00~15.00%, Ni0.20~0.50%, Mo1.0~1.3%, V0.30~0.50%, S≤0.03%, P ≤0.05%, the rest is Fe and unavoidable impurities.
[0024] The manufacturing method of the tool steel roll is as follows:
[0025] a) Smelting: The working layer of the roll body is made of high-quality scrap and appropriate alloy as raw materials, and is smelted in an induction furnace at a smelting temperature of 1500℃~1600℃; the molten steel is deoxidized with aluminum before being discharged, and the amount of aluminum added is molten steel 0.5%~1% by weight, reaction temperature is 1500℃~1560℃;
[0026] The core of the roll is ductile iron, pig iron is used as raw material, smelted in a blast furnace, the smeltin...
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[0034] Example 2:
[0035] The difference from Example 1 is:
[0036] The design targets for the alloy composition and weight percentage of the outer layer of tool steel are: C1.70~1.90%, Si0.80~1.00%, Mn0.70~0.90%, Cr11.00~13.00%, Ni1.50~1.80% , Mo0.20~0.50%, V0.40~0.60%, S≤0.03%, P≤0.05%, the rest is Fe and unavoidable impurities.
[0037] The amount of aluminum added during the smelting process is 0.8% of the molten steel weight, the addition amount of the inoculant is 0.5%, and the addition amount of the spheroidizing agent is 1.1%; during the centrifugal casting process, the centrifuge rotates at 750 rpm. After the molten steel in the working layer of the roll body is poured, the centrifuge speed is adjusted to 500 rpm; the annealing temperature of the preliminary heat treatment is 500 ℃, and the holding time is 180 hours; the quenching temperature of the final heat treatment is 900 ℃, and the quenching holding time is 5 hours, and it is cooled by a powerful blow Method: Tempe...
Example Embodiment
[0040] Example 3:
[0041] The difference from Example 1 is:
[0042] The alloy composition and weight percentage design targets of the outer layer of tool steel are: C1.80~2.00%, Si 0.70~0.90%, Mn0.60~0.80%, Cr12.00~14.00%, Ni0.80~1.10%, Mo1.30~1.50%, V0.60~0.80%, S≤0.03%, P≤0.05%, the rest is Fe and unavoidable impurities.
[0043] During the smelting process, the amount of aluminum added is 1% of the molten steel weight, the addition amount of the inoculant is 0.4%, and the addition amount of the nodulizer is 1.3%; during the centrifugal casting process, the centrifuge rotates at 700 rpm. After the molten steel is poured in the working layer of the roll body, the centrifuge speed is adjusted to 450 rpm; the annealing temperature of the preliminary heat treatment is 580°C, and the holding time is 200 hours; the quenching temperature of the final heat treatment is 1000°C, and the quenching holding time is 8 hours. Method: The tempering temperature is 500℃, and the tempering time i...
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