Preparation method of narrow-hardenability pinion steel
A hardenability, gear steel technology, applied in the direction of manufacturing converters, improving process efficiency, etc., can solve the problems of high production costs, achieve low production costs, reduce secondary oxidation, and improve desulfurization capabilities
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Embodiment 1
[0030] A narrow hardenability gear steel, which contains the following components in mass percentages:
[0031] C (carbon): 0.20%, Si (silicon): 0.26%, Mn (manganese): 1.02%, P (phosphorus): 0.010%, S (sulfur): 0.008%, Cr (chromium): 1.19%, Ti ( Titanium): 0.06%, B (boron): 0.0045%, W (tungsten): 0.032%, [O]: 11.0×10 -6 , [H]: 1.2×10 -6 , [N]: 40×10 -6 , the rest is Fe (iron) and unavoidable impurities.
[0032] The preparation method of above-mentioned narrow hardenability gear steel, it comprises the following steps:
[0033] 1) Primary smelting of top-bottom compound blowing converter:
[0034] The blast furnace molten iron is desulfurized by Mg which accounts for 20% of the total mass of the molten iron and 80% of the CaO desulfurizer powder spraying method, and then enters the top-bottom composite blowing converter for primary refining; the composition of the molten iron entering the top-bottom composite blowing converter is: C: 4.2%, Si: 0.60%, Mn: 0.48%, P: 0.098%,...
Embodiment 2
[0049] A narrow hardenability gear steel, which contains the following components in mass percentages:
[0050] C: 0.18%, Si: 0.30%, Mn: 0.90%, P: 0.012%, S: 0.010%, Cr: 1.35%, Ti: 0.04%, B: 0.005%, W: 0.025%, [O]: 11.5 ×10 -6 , [H]: 1.4×10 -6 , [N]: 45×10 -6 , and the rest are Fe and unavoidable impurities.
[0051] The preparation method of above-mentioned narrow hardenability gear steel, it comprises the following steps:
[0052] 1) Primary smelting of top-bottom compound blowing converter:
[0053] The blast furnace molten iron is desulfurized by Mg which accounts for 20% of the total mass of the molten iron and 80% of the CaO desulfurizer powder spraying method, and then enters the top-bottom composite blowing converter for primary refining; the composition of the molten iron entering the top-bottom composite blowing converter is: C: 3.8%, Si: 0.50%, Mn: 0.40%, P: 0.010%, S: 0.095%, and the rest are iron and unavoidable impurities. Five-hole Laval nozzle, the angle ...
Embodiment 3
[0067] A narrow hardenability gear steel, which contains the following components in mass percentages:
[0068] C: 0.22%, Si: 0.20%, Mn: 1.15%, P: 0.016%, S: 0.013%, Cr: 1.00%, Ti: 0.08%, B: 0.004%, W: 0.038%, [O]: 10.8 ×10 -6 ,[H]: 1.44×10 -6 , [N]: 35×10 -6 , and the rest are iron and unavoidable impurities.
[0069] The preparation method of above-mentioned narrow hardenability gear steel, it comprises the following steps:
[0070] 1) Primary smelting of top-bottom compound blowing converter:
[0071] The blast furnace molten iron is desulfurized by Mg which accounts for 20% of the total mass of the molten iron and 80% of the CaO desulfurizer powder spraying method, and then enters the top-bottom composite blowing converter for primary refining; the composition of the molten iron entering the top-bottom composite blowing converter is: C: 4.8%, Si: 0.70%, Mn: 0.60%, P: 0.008%, S: 0.008%, the rest is iron and unavoidable impurities, the temperature of molten iron enterin...
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