SPA-H weathering steel generally uses the same vertical, vertical bending or arc continuous casting machine as carbon SPA-H weathering steel plate. SPA-H weathering steel plate continuous casting processing technology, the molten steel after refining is poured into the ladle. The ladle to be poured is transferred to the tundish injection port through the turntable, and then the molten steel is injected into the tundish through the long nozzle. The molten steel in the tundish enters the crystallizer through the submerged nozzle to form and condense, and continuously moves down. The solidified casting slab passes through the second cooling section and continues to be rapidly cooled until the billet core becomes solid, and then cuts to a certain length to complete the continuous casting process. According to the different manufacturing processes, the SPA-H weathering steel plate can be divided into several basic types: hot rolled, extruded, cold drawn, and cold rolled. According to the shape of the section, it can be divided into round tubes and special-shaped tubes, but some are square , Rectangular, semi-circular, equilateral triangle, octagon and other SPA-H weathering steel plates. The test of the fluid pressure on the key is to ensure whether it can withstand the needs and to ensure the smooth progress of the project. SPA-H weather-resistant steel sheet uses alloy elements to form a dense oxide film on the surface, which effectively isolates SPA-H weather-resistant steel sheet from oxygen and prevents further oxidation, so it can well prevent rust.
The product quality advantage of the SPA-H weathering steel sheet produced by the continuous casting billet process is concentrated in the non-repair rate of the outer surface of the billet except for the head and tail sections, which has reached over 70%. The SPA-H weathering steel sheet continuous casting process requires refining the molten steel in the process to achieve a lower oxygen and sulfur content, accurately control the temperature of the molten steel, and further reduce the content of inclusions. The SPA-H weathering steel sheet was originally made by the ingot process, but this process has many shortcomings, so it was changed to use the slab process. In the slab process, the quality control measures of the continuous casting process are very perfect and have become an important means to improve product quality at present.
The SPA-H weathering steel sheet is subject to fluid pressure. Under the specified pressure, the SPA-H weathering steel plate will not leak, wet or swell. Generally, the SPA-H weathering steel plate is used in combination with a refining furnace, so the chemical composition and temperature of the molten steel are strictly required. In the SPA-H weathering steel sheet continuous casting process, the vibration marks formed on the surface of the continuous casting slab by the vibration of the mold during the continuous casting process also need to be controlled. According to different steel types, the vibration process of the crystallizer is matched with the protective slag, so as to achieve the goal that the surface of the slab of the SPA-H weathering steel plate is basically not ground. This can effectively improve the yield of SPA-H weathering steel sheet, improve production efficiency, and save energy consumption. Refractory materials such as ladle, tundish, East China nozzle and submerged nozzle are required to be strict. In order to prevent secondary oxidation of molten steel, non-oxidative protection casting is required during continuous casting production. Welcome to send email to
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SPA-H steel sheet is changed from ingot to slab casting process. And due to the improvement of continuous casting process quality control means, it has become a necessary means to improve product quality. Stamping elbow continuous casting is generally matched with refining furnaces, and has strict requirements on the chemical composition and temperature of molten steel; in order to prevent secondary oxidation of molten steel, continuous oxidation casting is required to adopt non-oxidation protection casting; for ladle, tundish, sliding Refractory materials such as nozzles and immersion nozzles have strict requirements; the quality advantage of SPA-H weathering steel continuous casting slabs is concentrated in the fact that the non-repair rate of the outer surface of the slabs except the head and tail sections has reached more than 78%. To achieve this goal, molten steel must be used. Refining is carried out to achieve lower oxygen and sulfur content, to accurately control the temperature of molten steel, to achieve non-oxidative pouring, and to further reduce the content of inclusions. SPA-H steel sheet continuous casting processing technology, in order to ensure the appearance quality of continuous casting slab, choose appropriate maintenance slag; continuous casting process due to crystallizer vibration on the surface of continuous casting slab to control the vibration marks; The continuous casting of bulk SPA-H weathering steel sheet must adopt electromagnetic stirring.
