SPA-C Steel

JIS G3125 SPA-C steel plate is a hot rolled steel sheet and strip of structural quality with improved atmospheric corrosion resistance. Below is the brief introduction of SPA-C Steel Elements.

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JIS G3125 SPA-C Steel Elements

Cu content of SPA-C steel is more resistant to atmospheric corrosion when used in combination with other elements such as P and Cr. When the Cu content is 0.25%, the steel has good weather resistance. When the content exceeds 0.30%, the corrosion resistance is improved slowly, and the effect of continuously increasing Cu is not large. At the same time, Cu-containing steel has the problem of hot processing sensitivity, and it is easy to produce mesh cracks. Therefore, in order to improve the atmospheric corrosion resistance and prevent cracks in the steel, the Cu content is designed to be 0.25 to 0.35%. 3.2.3 P is an effective element for improving atmospheric corrosion resistance in alloying elements. It is generally not used alone, and it is better to use it in combination with Cu, Cr, etc. When the P content is increased from 0.01% to 0.08%, the steel plate is resistant to the atmosphere. Corrosion performance is greatly improved, and after the P content exceeds 0.08%, the resistance to atmospheric corrosion is not significantly improved. At the same time, excessive addition will reduce the ductility of the steel.

The carbon of the SPA-C steel sheet is in the sub-peritectic range, which is liable to cause cracks. At the same time, the weathering steel also contains high elements such as Cu, P, Ni, etc. These elements tend to embrittle the grain boundary of the steel during the crystallization process, resulting in large thermal stress and tissue stress of the steel during cooling. If strong cooling is used in the continuous casting process, the crack is easily spread, and the cooling is too weak, which is liable to cause P segregation, resulting in internal cracking of the cast slab. Therefore, the steel grade should be moderately cooled during continuous casting. Therefore, in the production of weathering steel, the heat flow of the mold can not be high. According to the research on the production of weathering steel by Baosteel, the heat flux of the wide surface of the crystallizer is 1.4 to 1.6 MW/m2, and the weathering steel is not prone to longitudinal cracks. Compared with the cooling water volume of our company's crystallizer, the cooling water volume of the mold wide surface is reduced from 85-95m3/h to 80-85m3/h, so that the temperature difference between the inlet and outlet water is increased from 6-8 °C to 8-10 °C. 




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Shanghai Katalor Enterprises Co., Ltd

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