Production method for realizing continuous casting with low superheat degree
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A production method and technology of superheat, which is applied in the field of steelmaking and continuous casting, can solve the problems of ineffective continuous casting slabs over 300 mm thick, difficulty in large-scale promotion of industrial production, and slag removal, etc.
Inactive Publication Date: 2020-09-29
NANYANG HANYE SPECIAL STEEL CO LTD
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[0003] At present, the main measures to realize continuous casting with low superheat in China include light reduction of continuous casting slabs, electromagnetic stirring and other technologies. These technologies have achieved certain effects on improving low-fold quality, but the effect is not obvious for extra-thick continuous casting slabs above 300mm , restricting the technical development and large-scale application of continuous casting slabs to produce extra-thick plates
[0004] In industrial production practice, low-superheat pouring has a significant effect on improving the low-fold quality of contin
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Embodiment 1
[0025] A company’s 1# straight-arc single-point straightening continuous casting machine has a main radius of 9m for continuous casting, a tundish capacity of 30 tons, a depth of 0.8m, and no electromagnetic stirring and end pressing device. When using 250*1650mm section, the continuous casting speed is 0.75m / min and the continuous casting molten steel pouring speed is 2.37t / min; when pouring low alloy structural steel Q345B, the molten steel liquidus temperature is 1516℃, and the molten steel reaches the middle The initial temperature of the bag is 1548℃, and the set pouring temperature is 1528±3℃.
[0026] Using Φ10mm steel wire, the chemical composition content is: C: 0.16%, Si: 0.20%, Mn: 0.50%, P: 0.015%, S: 0.005%, Als: 0.020%, Cr <0.10%, Ni <0.05%, Mo <0.05%, Cu <0.05%, N <70ppm.
[0027] The first furnace of continuous casting billet pouring does not feed the wire. The second furnace starts to feed the wire at a speed of 31kg / min. The feeding position is located in the impa...
Embodiment 2
[0031] A company's 3# continuous casting 420*2700mm extra-thick section straight-arc continuous casting machine has a tundish capacity of 50 tons and a depth of 1.2 meters, equipped with electromagnetic stirring and light reduction devices. When the 400*2320 section is used for production, the continuous casting speed is 0.60m / min, the continuous casting molten steel pouring flow rate is 4.27t / min, when the general carbon structural steel Q235B is poured, the molten steel liquidus temperature is 1520℃, and the molten steel reaches the middle The initial temperature of the bag is 1550℃, and the pouring temperature is set to 1530±3℃.
[0032] Using Φ10mm steel wire, the chemical composition content is: C: 0.16%, Si: 0.20%, Mn: 0.50%, P: 0.015%, S: 0.005%, Als: 0.020%, Cr <0.10%, Ni <0.05%, Mo <0.05%, Cu <0.05%, N <70ppm.
[0033] The first furnace of continuous casting billet pouring does not carry out wire feeding. The second furnace starts to feed the wire at a speed of 60-65kg / min...
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Abstract
The invention belongs to the technical field of steelmaking and continuous casting, and specifically relates to a production method for realizing continuous casting with a low superheat degree. Moltensteel is cleanly smelted and cast in a tundish and a continuous casting machine, the temperature is reduced by adding a cold steel wire in the tundish, so that the superheat degree of the molten steel is stably controlled between 5 DEG C and 15 DEG C, the low magnification class C qualification rate of a continuous casting blank obtained reaches 80% or above, the equiaxed crystal area is expandedto 30-60%, and the columnar crystal area is reduced to 70% or below. The problem of large change in the pouring superheat degree between a furnace and a furnace caused by the unstable production rhythm of molten steel in the traditional process, the fluctuation of a pouring temperature and other factors is solved, stable low superheat degree pouring is achieved, and the stability of continuous casting pulling rate is ensured; and the production method for realizing continuous casting with the low superheat degree has obvious effects on improving the low-magnification quality of the continuouscasting blank, reducing the central segregation of the continuous casting blank in the thickness direction, and expanding the equiaxed crystal ratio of the continuous casting blank, especially for the low-magnification structure improvement of the extra-thick continuous casting blank of 300mm or above.
Description
Technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, and specifically relates to a production method for realizing continuous casting with low superheat. Background technique [0002] The low quality of continuous casting slab is one of the most critical factors that determine the flaw detection quality and performance uniformity of rolled steel sheets. Especially thick slab continuous casting slabs, the continuous casting slabs are prone to macroscopic defects such as coarse columnar crystals, central segregation, and core inclusions. These defects are difficult to eliminate in subsequent heating and rolling processes. The quality of steel plate inspections , Z-direction performance, and thickness direction performance uniformity have a greater impact. At the same time, the higher the content of alloying elements, the thicker the thickness of the continuous casting slab, the worse the quality of the continuous casting slab, ...
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