Integrated cast steel supporting roller
A technology for backup rolls and cast steel, applied in the direction of rolls, furnace types, furnaces, etc., can solve the problems of poor metallurgical bonding, peeling of working layers, easy roll breakage, etc., to improve the nucleation rate, reduce the radial hardness drop, cut small effect
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Embodiment 1
[0018] Example 1: Add scrap steel and corresponding ferroalloy materials except Ca, B, V and Ti elements in the intermediate frequency electric furnace, and carry out pre-furnace analysis on the composition of molten steel after melting, so that the composition obtained by smelting is (wt%): C : 0.43, Si: 0.38, P: 0.021, S: 0.013, Ni: 0.25, Cr: 4.83, Mo: 0.55, Mn: 0.69, and the rest are iron and impurities. 2 minutes before tapping, raise the furnace temperature to 1620°C and add 0.18wt% V-Fe (V is measured as a pure substance) and 0.2wt% Ti-Fe (Ti is measured as a pure substance), and add 0.010 wt% during tapping %B-Fe (B is measured as a pure substance), and 0.025 wt% calcium-silicon cored wire (Ca is measured as a pure substance) is inserted into the ladle after tapping. When the molten steel temperature is 1470°C, static casting of integral cast steel back-up roll slabs is started, and the composition of the obtained final sample is (wt%): C: 0.42, Si: 0.45, P: 0.022, S: 0...
Embodiment 2
[0019] Embodiment 2: As in Example 1, the smelting composition obtained is (wt%): C: 0.52, Si: 0.37, P: 0.022, S: 0.015, Ni: 0.21, Cr: 5.1, Mo: 0.60, Mn: 0.72, The rest is iron and impurities. 3 minutes before tapping, the furnace temperature was raised to 1615°C, and 0.19 wt % V-Fe (V was measured as a pure substance) and 0.18 wt % Ti-Fe (Ti was measured as a pure substance) were added, and 0.024 wt % was added during tapping. wt% B-Fe (B is measured as a pure substance), and 0.023 wt% calcium-silicon cored wire (Ca is measured as a pure substance) is inserted into the ladle after tapping. When the temperature of the molten steel is 1475°C, static casting of the integral cast steel back-up roll slab is started, and the composition of the obtained final sample is (wt%): C: 0.51, Si: 0.51, P: 0.023, S: 0.013, Ni: 0.23, Cr: 5.05 , Mo: 0.59, V: 0.16, Ti: 0.17, B: 0.019, Ca: 0.02, Mn: 0.70, and the rest are iron and impurities. The grain size of the slab core is grade 6. Put th...
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