Manufacturing method of graphite-contained high-speed steel centrifugal composite steel core roller
A technology of centrifugal compounding and high-speed steel, which is applied in the field of high-speed steel centrifugal compounding steel core roll manufacturing, can solve the problems of increased friction coefficient of the roll, affecting the surface quality of the rolled material, and increased wear of the bottom of the groove, so as to improve the surface quality of the rolled material, Improve the overall performance and reduce the effect of increasing the friction coefficient
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Embodiment 1
[0034] Embodiment 1 A kind of manufacturing method of the outer shell (working layer) of the centrifugal high-speed steel roll that contains graphite
[0035] 1) The chemical composition of the outer layer is composed by mass fraction (%): C 2.0-3.0%, Si 0.8-2.5%, Mn 0.2-1.0%, 0<P≤0.05%, 0<S≤0.02%, Cr 3-10 %, Ni 0.5-3.5%, Mo 2.5-6.0%, V 3-8%, 0<W≤10%, 0<B≤0.5%, N 60-500PPM, prepare the charge;
[0036] 2) Using intermediate frequency furnace for smelting;
[0037] 3) Si content before furnace control = Si content of finished product - 0.35%; V content before furnace control = V content of finished product - 0.25%;
[0038] 4) Measure the liquid and solidus temperature (T L , T S );
[0039] 5) Control the furnace temperature T 出 = liquidus temperature of the outer metal liquid (T L外 )+(240~300)℃;
[0040] 6) Metamorphic treatment of carbon, nitrogen and borides out of the furnace:
[0041] During the furnace discharge process, along with the metal flow, vanadium alloy ...
Embodiment 2
[0059] Embodiment 2 A kind of manufacturing method of graphite-containing high-speed steel centrifugal steel core composite roll
[0060] Continue with the 10) step of embodiment 1.
[0061] 11) The material of the roller core filling metal liquid is made of carbon-containing C1.2-2.5% semi-steel. Type (including the poured outer cylinder), the inner cavity of the upper roll neck sand mold, and the upper surface of the thermal insulation riser are 300-600mm lower, stop the core pouring, and then add 50-100mm thick thermal insulation agent to the surface of the molten metal in the riser, and stop filling core.
[0062] Replace the high-temperature core-filling molten metal in the same furnace and make some riser preparations. It is required to ensure that the superheat of the molten metal is 80-100°C on the liquidus line of the core-filling metal liquid, that is, T L芯 +(80~100)℃; After stopping the core filling, let it stand still, as time goes by, the temperature of the molt...
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