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Manufacturing method of rare earth microalloyed weather-resistant bridge steel for alpine regions
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A technology of micro-alloying and manufacturing method, applied in the direction of metal rolling, etc., can solve the problem of little research on steel plate
Inactive Publication Date: 2021-11-19
BAOTOU IRON & STEEL GRP
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[0003] Rare earth elements are characteristic resources in Baotou. With the promotion of capacity reduction and transformation and upgrading of the iron and steel industry in recent years, it is bound to become an important topic to give full play to the advantages of rare earth resources and improve the market position of rare earth steel. The rare earth steel plates currently studied (such as rare earth bridge steel , rare earth high-strength steel, rare earth wear-resistant steel, etc.), the rare earth content is below 30ppm, and there is little research on steel plates with high rare earth content
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Embodiment 1
[0030] Q345qD-RE bridge steel plate production process, the composition and mass percentage of steel are: C=0.072, Si=0.32, Mn=1.46, P=0.016, S=0.004, Als=0.022, Nb=0.028, Ti=0.011, Gr =0.027, Mo=0.003, Ni=0.020, Cu=0.020, Ce=0.0200.
[0031] The main process steps and parameters are as follows:
[0032] The molten iron must be pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is ≤0.010%, and the temperature is ≥1250°C. The slag must be cleaned before the molten iron enters the converter. About 85%, scrap about 15%. Converter end point control C-T coordinated tapping, P≤0.012%, S≤0.015%, strict slag blocking and tapping, tapping time 4-7min, adding alloy at 1 / 5 of tapping, adding alloy at 2 / 5 of tapping, During the tapping process, depending on the oxygen content at the end point, add an appropriate amount of modifier and lime, the oxygen should not be less than 250m, and make appropriate adjustments depending on the loading a...
Embodiment 2
[0043] Q345qD-RE bridge steel plate production process, the composition and mass percentage of steel are: C=0.071, Si=0.32, Mn=1.41, P=0.012, S=0.003, Als=0.023, Nb=0.025, Ti=0.011, Gr =0.028, Mo=0.004, Ni=0.019, Cu=0.016, Ce=0.0370.
[0044] The main process steps and parameters are as follows:
[0045] The molten iron must be pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is ≤0.010%, and the temperature is ≥1250°C. The slag must be cleaned before the molten iron enters the converter. About 85%, scrap steel about 15%. Converter end point control C-T coordinated tapping, P≤0.012%, S≤0.015%, strict slag blocking and tapping, tapping time 4-7min, adding alloy at 1 / 5 of tapping, adding alloy at 2 / 5 of tapping, During the tapping process, depending on the oxygen content at the end point, add an appropriate amount of modifier and lime, the oxygen should not be less than 250m, and make appropriate adjustments depending on the loa...
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Abstract
The invention discloses a manufacturing method of rare earth microalloyed weather-resistant bridge steel for alpine regions. Compared with the prior art, the method has the advantages that a mode of adding rare earth is different, and by adding rare earth wires containing rare earth cerium Ce in the slab casting process, the defect of low rare earth yield caused by addition of rare earth alloy in the RH refining process is overcome, and the rare earth element yield is greater than 80%; and secondly, the rare earth content of a bridge steel plate is greater than 60 ppm, the low-temperature impact performance of the steel plate is improved through the high rare earth content, weather resistance is improved, and the long-time cognition that only a small amount of rare earth (0-10 ppm) can generate beneficial improvement on the steel plate and on the contrary, addition of a large amount of rare earth can generate inclusions to affect the performance of the steel plate is subverted to a certain extent.
Description
technical field [0001] The invention relates to the technical field of medium-thick plate manufacturing, in particular to a method for manufacturing rare-earth microalloyed weather-resistant bridge steel for alpine regions. Background technique [0002] In recent years, the development of the transportation industry has led to great progress in bridge construction in my country. The large-scale construction of various highway bridges, railway bridges, and sea-crossing bridges has created a huge market for bridge steel. The performance of bridge steel puts forward higher requirements. High strength, high toughness, excellent weldability, corrosion resistance and fatigue resistance have become the characteristics that high-performance bridge steel should possess. At the same time, the change of bridge design concepts and the increasing requirements for bridge manufacturing cycle and other aspects, the traditional structural steel plate can no longer fully meet the requirements ...
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