Production method of low-titanium bearing steel GCr15
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A production method and technology of bearing steel, which is applied in the field of bearing steel preparation, can solve the problems of increased cost, low yield, difficulty in controlling the oxidation of ferrochrome alloy, etc., and achieve the effect of solving cost increase and saving precious ferroalloy
Active Publication Date: 2015-09-02
BENGANG STEEL PLATES
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And this method is not easy to grasp and control the oxidation of ferrochromium alloy, and it is easy to cause low yield and increase cost
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Embodiment 1
[0019] A production method of low-titanium bearing steel GCr15, sequentially through EBT eccentric bottom electric furnace, LF refining furnace, VD vacuum furnace, continuous casting or mold casting, specifically comprises the following steps:
[0020] 1) To charge the EBT eccentric bottom electric furnace, according to the weight percentage, the proportion of molten iron is 60%, and the rest is mixed with scrap steel; what adopts in this embodiment is that the molten steel can be the high-quality molten iron+scrap steel of Benxi Iron and Steel, and the scrap steel here refers to , the standard number is steel scrap stipulated in GB 4223;
[0021] 2) The electric furnace blows oxygen into the molten steel through a supersonic oxygen lance to remove C, control the tapping C≤0.40% (weight percentage), and tap the steel at a temperature of 1640°C. The eccentric bottom tapping is adopted to prevent under-oxidation by leaving steel and slag. Slag, while tapping the steel, add high-...
Embodiment 2
[0027] The difference from Example 1 is a production method of low-titanium bearing steel GCr15, which sequentially passes through EBT eccentric bottom electric furnace, LF refining furnace, VD vacuum furnace, continuous casting or die casting, specifically including the following steps:
[0028] 1) To charge the EBT eccentric bottom electric furnace, according to the weight percentage, the proportion of molten iron is 70%, and the rest is mixed with scrap steel;
[0029] 2) The electric furnace blows oxygen into the molten steel through a supersonic oxygen lance to remove C, and controls the tapping C≤0.40%, and the tapping temperature is 1685°C. The eccentric bottom tapping is adopted to prevent the oxidized slag by leaving steel and slag. At the same time as the steel is tapped, high-carbon ferrochromium, silicon-manganese alloy and ferrosilicon are respectively added according to the weight percentage content of Cr 1.40%, Mn 0.25% and Si 0.15%;
[0030] 3) After tapping, e...
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Abstract
The invention relates to a production method of low-titanium bearing steel GCr15. The method sequentially comprises the following steps: EBT eccentric bottom electric furnace, LF (ladle furnace) refining furnace, VD (vacuum degasser), and continuous casting or die casting. In the electric furnace, oxygen is blown into molten steel by an ultrasonic oxygen lance to remove C and control the tapping C content to be at most 0.40%, the tapping temperature T is greater than or equal to 1640 DEG C and smaller than or equal to 1685 DEG C, and eccentric bottom tapping is subjected to steel-leaving slag-leaving operation to prevent the oxidizing slag. In the tapping process, high carbon ferrochrome, silicomanganese and silicon iron are respectively added according to the Cr content of 1.40 wt%, Mn content of 0.25 wt% and Si content of 0.15 wt%. After tapping, the steel enters the LF refining furnace to perform refining, 0.4kg of aluminum wire is added to every ton of steel in the LF refining furnace to control the Al content to be at most 0.04%, and the refining slag is composed of the following components in percentage by weight: 50-60% of CaO, 25-35% of Al2O3, 5-10% of SiO2 and 6-10% of MgO. The refining temperature is controlled at 1580-1600 DEG C. The smelting process uses common iron alloy to smelt the bearing steel, and can control the titanium content to be not greater than 50 ppm, thereby saving the noble iron alloy and solving the problem of cost increase in low-titanium bearing steel smelting.
Description
technical field [0001] The invention belongs to the field of bearing steel preparation, and specifically relates to a production method of low-titanium bearing steel GCr15. Background technique [0002] The nitrides in bearing steel mainly exist in TiN or TiCN, which is a kind of non-deformable inclusions with high hardness. When the size of inclusions is the same in bearing steel, nitrides are more harmful than oxide inclusions. When the titanium content in bearing steel is greater than 50ppm, its fatigue life begins to decrease significantly. Reducing the Ti content of bearing steel is of great significance to improving the quality level of Shigang bearing steel. Therefore, some well-known foreign companies have clear requirements for the Ti content in bearing steel. The national standard for high-carbon chromium bearing steel in my country has been revised, and the Ti content has been clearly required. The standard will be implemented soon. [0003] The biggest technical...
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