Centrifugal high-carbon, high-boron and high-speed steel composite roller shell and fabrication method of combined roller of composite roller shell

[0015] Example 1, the material composition of the outer layer of the centrifugal composite high carbon high boron high speed steel composite roller sleeve is C1.5, Si0.9, Mn0.8, P<0.03, S<0.03, Cr5.0, Ni0.75, Mo2. 0, W1.5, Nd0.5, V5.0, Ti1.5, B0.5, N0.12, the balance is Fe. The molten steel is melted, and after the composition in front of the furnace is qualified, the temperature of the molten steel is increased to 1620°C, aluminum and silicon calcium are added for deoxidation, and then out of the furnace. The material composition of the inner layer of the centrifugal composite high-carbon high-boron high-speed steel composite roller sleeve is C1.3, Si2.0, Mn0.6, Cr0.4, Ni0.4, Mo0.3, the balance is Fe, and the composition before the furnace is qualified. After that, the temperature of the molten steel is raised to 1590°C and waits for tapping. During the tapping process, calcium silicon, ferrosilicon and aluminum are added to the molten steel for deoxidation, deterioration and inoculation. After the operation is completed, it will wait for pouring.

[0016] Centrifugal composite casting of high-carbon and high-boron high-speed steel composite roller sleeves, the outer pouring temperature is 1500 ℃, the inner surface of the outer high-carbon and high-boron high-speed steel is cooled to 1220 ℃, the inner layer is poured, and the inner pouring temperature is 1450 ℃. The thickness is 20mm. During the pouring process, the centrifuge linear speed is 18m/s. After the inner layer is solidified, it is removed from the machine for heat preservation and cooling, followed by heat treatment and machining to obtain the finished product of high carbon and high boron high speed steel composite roller sleeve.

[0017] The heat treatment process of the high-carbon and high-boron high-speed steel composite roller sleeve is to first carry out high temperature annealing treatment at 1030℃, the annealing holding time is 8h, and then quenching after rough machining. The quenching temperature is 1020℃, the quenching holding time is 2h, and the blowing is performed after the holding After quenching, enter the furnace for two tempering heat treatments. Tempering 1 is 500℃×30h, and tempering 2 is 550℃×30h.

[0018] After machining the high-carbon and high-boron high-speed steel composite roll sleeve, the hot-charging method is used to manufacture the high-carbon and high-boron high-speed steel composite roll. The preheating temperature of the sleeve is 170℃, and a layer of 600 mesh silicon carbide powder is coated on the roller shaft. After trial, the service life of the high-speed steel combined roll is 27% longer than that of the traditional high-speed steel roll, and the material utilization rate is increased by 46%.

[0019] Example 2, the composition of the outer layer of the centrifugal composite high-speed steel composite roller ring is C1.7, Si0.8, Mn0.6, P<0.03, S<0.03, Cr8.2, Ni1.0, Mo4.0, W0. 5. Nd1.3, V4.0, Ti1.1, B1.5, N0.15, the balance is Fe, the temperature of the molten steel is raised to 1600℃, aluminum and silicon calcium are added for deoxidation, and then out of the furnace. The material composition of the inner layer of the centrifugal composite high-speed steel composite roll ring is C1.72, Si1.1, Mn0.72, Cr1.35, Ni0.9, Mo0.6, and the balance is Fe. After the composition of the furnace is qualified, the steel The temperature of the liquid rises to 1580°C and waits for tapping. During the tapping process, calcium silicon, ferrosilicon and aluminum are added to the molten steel for deoxidation, deterioration and inoculation. After the operation is completed, it waits for pouring.

[0020] Centrifugal composite casting high-speed steel composite roll ring, the outer layer casting temperature is 1490℃, the inner layer of the outer layer of high-speed steel is cooled to 1200℃, the inner layer is poured, the inner layer casting temperature is 1480℃, and the casting thickness is 50mm. During the pouring process, the centrifuge linear speed is 19m/s. After the inner layer is solidified, it is removed from the machine for heat preservation and cooling, followed by heat treatment and machining to obtain the finished product of high carbon high boron high speed steel composite roller sleeve.

[0021] The heat treatment process of the high-carbon and high-boron high-speed steel composite roller sleeve is to first carry out high temperature annealing treatment at 1050℃, annealing holding time is 6h, quenching treatment after rough machining, quenching temperature is 1000℃, quenching holding time is 3h, and blowing after heat preservation After quenching, enter the furnace for two tempering heat treatments. Tempering 1 is 500℃×30h, and tempering 2 is 550℃×30h.

[0022] After machining the high-carbon and high-boron high-speed steel composite roll sleeve, the hot-charging method is used to manufacture the high-carbon and high-boron high-speed steel composite roll. The preheating temperature of the sleeve is 200℃, and a layer of 200 mesh silicon carbide powder is coated on the roller shaft. After trial, the high-carbon and high-boron high-speed steel combined rolls have a 32% longer service life and a 41% increase in material utilization than centrifugal cast high-speed steel rolls.

[0023] Example 3, the material composition of the outer layer of the centrifugal composite high carbon high boron high speed steel composite roller sleeve is C2.1, Si1.2, Mn0.67, P<0.03, S<0.03, Cr10, Ni0.5, Mo3.7, W2.0, Nd2.0, V6.0, Ti0.5, B2.0, N0.05, the balance is Fe. Raise the temperature of molten steel to 1610°C, add aluminum and silicon calcium for deoxidation, and then out of the furnace. The material composition of the inner layer of the centrifugal composite high-carbon high-boron high-speed steel composite roller sleeve is C2.0, Si1.5, Mn0.8, Cr1.5, Ni1.5, Mo0.2, the balance is Fe, and the composition before the furnace is qualified. Afterwards, the temperature of the molten steel is raised to 1600°C to wait for tapping. During the tapping process, calcium silicon, ferrosilicon and aluminum are added to the molten steel for deoxidation, deterioration and inoculation. After the operation is completed, it will wait for pouring.

[0024] Centrifugal composite casting of high-carbon and high-boron high-speed steel composite roller sleeve, the outer pouring temperature is 1450 ℃, the inner surface of the outer high-carbon and high-boron high-speed steel is cooled to 1250 ℃, the inner layer is poured, and the inner pouring temperature is 1500 ℃. The thickness is 40mm. During the pouring process, the centrifuge linear speed is 20m/s. After the inner layer is solidified, it is removed from the machine for heat preservation and cooling, followed by heat treatment and machining to obtain the finished product of high carbon and high boron high speed steel composite roller sleeve.

[0025] The heat treatment process of the high-carbon and high-boron high-speed steel composite roller sleeve is to first carry out high temperature annealing treatment at 1020℃, annealing holding time is 4h, quenching treatment after rough machining, quenching temperature is 1050℃, quenching holding time is 4h, and blowing after heat preservation After quenching, enter the furnace for two tempering heat treatments. Tempering 1 is 500℃×30h, and tempering 2 is 550℃×30h.

[0026] After machining the high-carbon and high-boron high-speed steel composite roll sleeve, the hot-charging method is adopted to manufacture the high-carbon and high-boron high-speed steel composite roll. The preheating temperature of the sleeve is 150℃, and a layer of 800 mesh silicon carbide powder is coated on the roller shaft. After trial, the service life of the high-speed steel combined roll is 29% longer than that of the traditional high-speed steel roll, and the material utilization rate is increased by 43%.