Method for controlling MnS inclusions in high-speed heavy rail steel
A control method and technology for heavy rail steel, applied in the direction of manufacturing converters, etc., can solve the problems of reducing the desulfurization cost of heavy rail steel, exceeding the standard of A-type inclusions, etc., and achieve the effect of reducing the desulfurization cost, size and quantity
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Embodiment 1
[0016] The molten iron is divided into two batches, the first batch is smelted into heavy rail steel by the steps of molten iron pretreatment, converter smelting, LF refining, RH refining, continuous casting, hot continuous rolling, and controlled cooling after rolling, and the second batch is smelted in RH refining operation During the process, titanium is added when the sulfur content is 0.01-0.02% and the oxygen content is less than 0.001%, and the added titanium content is controlled to be 0.01% of the weight of the molten steel.
[0017] Detect the MnS inclusion state in the first batch of steel, the picture is as follows figure 1 and figure 2 As shown, it can be seen that the spherical MnS inclusions without titanium are deformed into strip-shaped MnS inclusions with the steel deformation during the rolling process.
[0018] Detect the state of MnS inclusions in the second batch of steel, the pictures are as follows image 3 and Figure 4 It shows that there is a lay...
Embodiment 2
[0020] The molten iron is divided into two batches, the first batch is smelted into heavy rail steel by the steps of molten iron pretreatment, converter smelting, LF refining, RH refining, continuous casting, hot continuous rolling, and controlled cooling after rolling, and the second batch is smelted in RH refining operation During the process, when the sulfur content is 0.01~0.02% and the oxygen content is less than 0.001% (generally about 10 min in RH refining), titanium is added, and the added titanium content is controlled to be 0.006% of the weight of molten steel.
[0021] The detection of the state of MnS inclusions in the first batch of steel found that the spherical MnS inclusions without titanium were deformed into strip-shaped MnS inclusions during the rolling process.
[0022] The detection of the MnS inclusion state in the second batch of steel found that there is a layer of titanium sulfide on the periphery of the MnS inclusion in the slab, and the MnS inclusion ...
Embodiment 3
[0024] The molten iron is divided into two batches, the first batch is smelted into heavy rail steel by the steps of molten iron pretreatment, converter smelting, LF refining, RH refining, continuous casting, hot continuous rolling, and controlled cooling after rolling, and the second batch is smelted in RH refining operation During the process, when the sulfur content is 0.01~0.02% and the oxygen content is less than 10ppm (generally about 10 min in RH refining), titanium is added, and the added titanium content is controlled to be 0.008% of the weight of molten steel.
[0025] The detection of the state of MnS inclusions in the first batch of steel found that the spherical MnS inclusions without titanium were deformed into strip-shaped MnS inclusions during the rolling process.
[0026] The detection of the MnS inclusion state in the second batch of steel found that there is a layer of titanium sulfide on the periphery of the MnS inclusion in the slab, and the MnS inclusion i...
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