High-strength weathering steel thin strip and production method thereof

Abstract

The invention relates to a high-strength weathering steel thin strip and a production method thereof. The method comprises the following steps of smelting, specifically, a steel ladle correspondinglycomprises the ingredients of, in percentage by weight, less than or equal to 0.03% of C, 0.10-0.40% of Si, 1.50-2.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.003% of S, lessthan or equal to 0.50% of Cr, 0.20-1.00% of Cu, 0.05-0.50% of Nb and the balance ferrum and unavoidable impurities; thin strip continuous casting, specifically, liquid steel qualified by the smeltingis subjected to the continuous casting to from a cast strip with the thickness being 1.4-2.5 mm through a pair of casting rollers rotating in opposite directions, and the liquid steel overheating temperature is controlled to be 100 DEG C or below; cast strip online hot rolling, specifically, the first-pass hot rolling press-down quantity is 15-65%, and the temperature of strip steel before entering a rolling mill is 950 DEG C or above; and cooling and coiling, the hot-rolled strip steel is cooled to 450-650 DEG C through aerial fog, acicular ferrite and a small amount of pearlite tissue are obtained, and then the steel thin strip is coiled into rolls by a coiler. The high-strength weathering steel thin strip has the advantages of being short in production procedure, low in production cost,easy to weld, good in strip steel plate shape, high in strength and the like and can be widely used in the fields of bridges, buildings, containers, railway carriages and the like.

Description

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AI Technical Summary

Benefits of technology

This patented technology can reduce the concentration of carbon (C), decrease crack formation on cast strips made from this type of material, increase its strength without adding extra weight or making it more expensive than usual for certain applications such as automobile body panels that require excellent impact resistance properties like crashworthiness requirements. Additionally, by decreasing the ratio between iron oxide (FeO2) and silicon dioxide (Si02). By doing these things, the manufacturing costs associated therewith may be significantly lowered while maintaining good mechanical characteristics.

Problems solved by technology

This patents discusses developing a new type of material called martensitics (M) instead of plain iron or chrome plating used in industries like building materials because they offer greater durability compared to conventional alloys while maintaining their effectiveness at lower temperatures. Additionally, these metals may cause environmental concerns over disposal issues if improperly discarded after use. Existing techniques involve expensive equipment and complex procedures, resulting in poor performance and increased costs associated with current methods.

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