Calcium-tellurium synergistic gear steel as well as preparation method and application thereof
A technology of gear steel and molten steel, applied in the field of alloys, can solve problems such as difficult MnS forms, achieve the effects of alleviating the problem of uneven processing, simple operation, and high cost
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[0046] The application also provides a method for preparing the described calcium-tellurium synergistic gear steel, comprising:
[0047] The raw materials are subjected to converter smelting, LF refining, RH refining and continuous casting to obtain the calcium-tellurium synergistic gear steel.
[0048] The function of converter smelting: adjust the temperature of molten steel, decarburize and dephosphorize, and control the C and P of the end point within the target value range.
[0049] The function of LF furnace refining: adjust the oxygen content in the molten steel, adjust the composition of the molten steel, and control the content of sulfur and tellurium in the molten steel within the target value range.
[0050] The role of RH furnace refining: adjust the composition of molten steel and control the content of calcium in the molten steel within the target value range.
[0051] The role of continuous casting: the production process of continuously casting the refined mol...
Embodiment 1
[0074] This embodiment provides a calcium-tellurium synergistically treated gear steel, the composition (wt%) of which is: C: 0.41%, Si: 0.25%, Mn: 0.78%, S: 0.02%, P: 0.018%, Cr: 1.08%, Mo: 0.20%, Ca: 0.002%, Te: 0.01%, and the rest are Fe and inevitable impurity elements. where [Ca] / ω[S]: 0.1, ω[Te] / ω[S]: 0.5.
[0075] The gear steel adopts the process flow of converter smelting → LF refining → RH refining → continuous casting, as follows:
[0076] Converter smelting: the content of Si in the molten iron is 0.60%, the content of P is 0.11%, and the amount of slag is 0.48%. Pay attention to the residual elements of molten iron and molten steel before and during production to ensure that the standard requirements are met. High tension blowing is adopted to control the composition of tapping: C: 0.08%, P: 0.008%. When tapping, add manganese silicon to the ladle: 7.5kg / t, high carbon ferrochromium Cr54C7.2: 14.5kg / t, and ferromolybdenum: 3.1kg / t; the amount of alloy is adjust...
Embodiment 2
[0082] This embodiment provides a calcium-tellurium synergistically treated gear steel, the composition (wt%) of which is: C: 0.41%, Si: 0.25%, Mn: 0.78%, S: 0.02%, P: 0.018%, Cr: 1.08%, Mo: 0.20%, Ca: 0.003%, Te: 0.02%, and the rest are Fe and inevitable impurity elements. where [Ca] / ω[S]: 0.15, ω[Te] / ω[S]: 1.
[0083] The gear steel adopts the process flow of converter smelting → LF refining → RH refining → continuous casting, as follows:
[0084] Converter smelting: the content of Si in the molten iron is 0.60%, the content of P is 0.11%, and the amount of slag is 0.48%. Pay attention to the residual elements of molten iron and molten steel before and during production to ensure that the standard requirements are met. High tension blowing is adopted to control the composition of tapping: C: 0.08%, P: 0.008%. When tapping, add manganese silicon to the ladle: 7.5kg / t, high carbon ferrochromium Cr54C7.2: 14.5kg / t, and ferromolybdenum: 3.1kg / t; the amount of alloy is adjusted ...
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