A kind of 45 steel hot-rolled round steel bar specially used for the spindle of CNC machine tools and its preparation method
A technology for CNC machine tools and bars, which is applied in the directions of manufacturing converters, improving process efficiency, reducing gas emissions, etc., can solve problems such as undisclosed technical problems and defects, and achieves strong process applicability and controllability, and comprehensive product mechanics. And the effect of excellent process performance and stable product quality
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[0032] For realizing the program purpose of the present invention, also provide a kind of preparation method specially for the 45 steel hot-rolled round bar of CNC machine tool main shaft, such as figure 1As shown, it is characterized in that the method includes molten steel smelting, LF furnace refining, molten steel casting, billet heating, rolling, and steel finishing processes, specifically including:
[0033] A. Molten steel smelting: Add molten iron, scrap steel and pig iron into the LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite and magnesite balls according to the conventional amount to make slag, and control the carbon content of the end point to be ≥0.08 wt%. The temperature of the steel is less than 1670°C; add lime to the bottom of the ladle before tapping, and the amount of lime added is: 4.0kg / t 钢 ; When tapping, adopt slag washing and full bottom argon blowing process, the flow of argon gas is controlled at 20-40NL / mi...
Embodiment 1
[0071] A. Molten steel smelting: Add molten iron, scrap steel and pig iron into the LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite and magnesite balls according to the conventional amount to make slag, and control the carbon content of the end point to be ≥0.08 wt%. The temperature of the steel is less than 1670°C; add lime to the bottom of the ladle before tapping, and the amount of lime added is: 4.0kg / t 钢 ; When tapping, adopt slag washing and full bottom argon blowing process, the flow of argon gas is controlled at 20-40NL / min, when the amount of molten steel in the ladle is greater than 1 / 4, add the following substances to the ladle in turn: 7.5-9.5kg / t 钢 The amount of high-carbon ferromanganese added in the following mass ratio: Mn 75.8wt%, C 6.7wt%, the rest is Fe and unavoidable impurities; according to 2.0kg / t 钢 Add the following mass ratio of silicon-calcium-barium alloy: Si 58.2wt%, Ca12.5wt%, Ba 16.5wt%, the rest is Fe...
Embodiment 2
[0083] A. Molten steel smelting: Add molten iron, scrap steel and pig iron into the LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite and magnesite balls according to the conventional amount to make slag, and control the carbon content of the end point to be ≥0.08 wt%. The temperature of the steel is less than 1670°C; add lime to the bottom of the ladle before tapping, and the amount of lime added is: 4.0kg / t 钢 ; When tapping, adopt slag washing and full bottom argon blowing process, the flow of argon gas is controlled at 20-40NL / min, when the amount of molten steel in the ladle is greater than 1 / 4, add the following substances to the ladle in turn: 7.5-9.5kg / t 钢 The amount of high-carbon ferromanganese added in the following mass ratio: Mn 75.8wt%, C 6.7wt%, the rest is Fe and unavoidable impurities; according to 2.0kg / t 钢 Add the following mass ratio of silicon-calcium-barium alloy: Si 58.2wt%, Ca12.5wt%, Ba 16.5wt%, the rest is Fe...
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