High-boron high-speed steel composite roller and manufacturing method thereof

High-boron high-speed steel composite roller and manufacturing method thereof

  • CN 103,866,200 B
  • Filed: 10/28/2013
  • Issued: 02/25/2015
  • Est. Priority Date: 10/28/2013
  • Status: Active Grant
First Claim
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1. the preparation method of a high-boron high-speed steel assembly roller, it is characterized in that, high-boron high-speed steel assembly roller is combined into one by hot charging by roll shaft and high-boron high-speed steel compound roller shell, the skin of compound roller shell is wear-resisting high-boron high-speed steel, internal layer is steel pipe, roll shaft is placed in steel inner coaxial tube and runs through steel pipe, specifically comprises the following steps:

  • 1. the molten steel of the first outer abrasion resistant high-boron high-speed steel of melting high-boron high-speed steel compound roller shell in medium-frequency induction furnace, the chemical composition of high-boron high-speed steel molten steel and massfraction are;

    1.25 ~ 1.80%C, 1.25 ~ 1.60%B, 5.5 ~ 8.0%Cr, 1.0 ~ 1.5%W, 2.5 ~ 3.0%Mo, 0.3 ~ 0.6%V, 0.6 ~ 1.2%Ni, 0.3 ~ 0.9%Si, 0.30 ~ 0.55%Mn, S<

    0.04%, P<

    0.05%, surplus is Fe and inevitable impurity;

    2. when the temperature of above-mentioned high-boron high-speed steel molten steel reaches 1580 ~ 1600 DEG C, ladle of being come out of the stove to by molten steel, then adds diameter in ladle alloy wire, the chemical composition of alloy wire and massfraction are;

    1.5 ~ 2.0%Ca, 1.5 ~ 2.0%Ba, 4.0 ~ 6.0%Y, 5.0 ~ 6.5%V, 1.0 ~ 1.5%N, 2.5 ~ 3.0%Zr, 10 ~ 12%Si, 25 ~ 28%Al, surplus is Fe and inevitable impurity, and alloy wire add-on accounts for 2.0 ~ 2.5% of steel quality mark in ladle;

    3. alloy wire added molten steel after 1 ~ 2 minute, stirs and skim to molten steel, when liquid steel temperature is down to 1450 ~ 1480 DEG C, by pouring molten steel in metallic mould, wherein mold temperature is preheating to 120 ~ 180 DEG C, has laid the steel pipe being preheating to 600 ~ 800 DEG C in advance, pipe diameter in casting mold thickness of steel pipe 10 ~ 15mm, steel pipe length increases by 3 ~ 5mm than the length of high-boron high-speed steel roller shell, the chemical composition of steel pipe and massfraction are;

    0.12 ~ 0.20%C, 0.20 ~ 0.55%Si, 1.20 ~ 1.60%Mn ,≤

    0.035%P ,≤

    0.03%S, surplus is Fe and inevitable impurity, and molten steel is poured in the die cavity between metallic mould and steel pipe;

    4. pouring molten steel is after 2 ~ 4 hours, unpack and take out casting compound roller shell, enter process furnace or burial pit slow cooling to temperature lower than air cooling after 120 DEG C to room temperature, then carry out roughing to casting composite roll cover, the compound roller shell after roughing is heated to 480 ~ 550 DEG C with stove, be incubated after 10 ~ 15 hours, air cooling, to room temperature, then carries out precision work, is continued to be heated to 250 ~ 320 DEG C with stove by the compound roller shell after precision work, be incubated and come out of the stove after 4 ~ 6 hours, carry out hot charging compound with the roll shaft processed.

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