Large-specification Z-direction H-steel and preparation method thereof
A H-shaped steel and large-scale technology, which is applied in the field of large-sized Z-direction H-shaped steel and its preparation, can solve the problems of low P and S content control requirements, difficult steel application, complex production process, etc.
Active Publication Date: 2012-08-01
LAIWU IRON & STEEL GRP
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Problems solved by technology
However, the scope of application of this invention is steel plates, and the production process is too complicated. At the same time, the control requirements for P and S content are too low (P≤0.008%, S≤0.002%), so it is difficult to apply in the production process of section steel
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[0025] The process route is:
[0026] Hot metal pre-desulfurization→converter smelting→LF refining→full-protection continuous casting of special-shaped billet→1-3 rolling mill arrangement type production line rolling→inspection and storage.
[0027] The main technological measures of the preparation method:
[0028] (1) The molten iron arrives at the desulfurization station, and the sulfur content in the molten iron is guaranteed to be ≤0.007wt% after desulfurization.
[0029](2) Converter smelting: The raw materials to be fed into the furnace must meet the following requirements: sulfur content of molten iron ≤0.007wt%; operation with large amount of slag and low lance position, and low-sulfur steelmaking slag (S≤0.07wt%) for blowing process The slag is added in two batches (2 / 3 of the slag is added in the first batch), and the slag is well melted and thoroughly melted throughout the process; the ladle adopts a red net ladle with a good bottom blowing, and the baking tempera...
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Abstract
The invention provides large-specification Z-direction H-steel and a preparation method thereof. The large-specification Z-direction H-steel comprises the following chemical components in weight percentage: 0.12-0.22 percent of C, 0.10-0.40 percent of Si, 1.1-1.50 percent of Mn, not greater than 0.020 percent of P, not greater than 0.008 percent of S, 0.02-0.05 percent of V and the balance of Fe and trace impurity. According to the large-specification Z-direction H-steel provided by the invention, mainly through reducing sulphur content and alloying only by adding trace V without adding other elements, immersion-type flat water gap fully-protective casting is adopted in the continuous casting process, and cooling control and thermal treatment are not needed after rolling is ended. Because of the complexity of a beam blank continuous casting machine, aluminium deoxidation is not adopted. Therefore, the component design and the production of the large-specification Z-direction H-steel are completed.
Description
technical field [0001] The invention relates to metallurgical technology, and belongs to low-alloy Z-direction H-shaped steel, in particular to a large-scale Z-direction H-shaped steel and a preparation method thereof. Background technique [0002] With the increasing use of H-shaped steel for construction, higher requirements are put forward for the steel materials used. At present, there is no Z-direction performance requirement for H-shaped steel used in construction. When carrying a large Z-direction load, the safety performance will be greatly reduced. [0003] Large-scale Z-direction H-shaped steel is mainly used in buildings, bridges, power station equipment, water conservancy, energy, chemical industry, lifting and transportation machinery and other steel structures with high seismic requirements. This steel contains less non-metallic materials and has higher Z-direction performance. At the same time, the product is formed by one-time hot rolling without welding, w...
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IPC IPC(8): C22C38/12
Inventor 付常伟袁鹏举张思勋韩蕾蕾邓存善郭跃华霍喜伟刘春伟朱京军方金林高祥明孔令坤孙晓庆
Owner LAIWU IRON & STEEL GRP