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 A
  • Filed: 10/28/2013
  • Published: 06/18/2014
  • 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 the compound roller shell of high-boron high-speed steel, 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 elder generation'"'"'s wear-resisting high-boron high-speed steel of skin of the compound roller shell of melting high-boron high-speed steel 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, by the molten steel ladle of coming out of the stove, then in ladle, add diameter 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 the interior steel quality mark of ladle;

    3. alloy wire adds molten steel after 1~

    2 minute, molten steel is stirred and is skimmed, in the time that 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 in advance the steel pipe that is preheating to 600~

    800 DEG C, pipe diameter in casting mold thickness of steel pipe 10~

    15mm, the length of steel pipe Length Ratio high-boron high-speed steel roller shell increases by 3~

    5mm, 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 the compound roller shell of casting, enter process furnace or burial pit slow cooling to temperature lower than air cooling after 120 DEG C to room temperature, then casting composite roll cover is carried out to roughing, 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.Compound roller shell after precision work is continued to be heated to 250~

    320 DEG C with stove, be incubated and come out of the stove after 4~

    6 hours, to carry out hot charging compound with the roll shaft processing.

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