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An ultra-low carbon steel composition, the process of production of an ULC BH steel product and the product obtained
An ultra-low carbon steel composition, the process of production of an ULC BH steel product and the product obtained
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机译:超低碳钢组合物,ULC BH钢产品的生产方法和所得产品
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摘要
The present invention describes an ultralow carbon bake hardenable galvanised or galvannealed steel product, having a higher yield strength at the temperature of the molten zinc bath while maintaining a low yield strength and excellent bake hardening properties in a skinpassed condition, BH0 being higher than 35MPa and BH2 higher than 40MPa (GI) and BH0 20MPa and BH2 30MPa (GA), as well as having a superior paint appearance after stamping and painting. The content in the steel composition of the Ti is comprised between 3,42 N and 3,42 N + 60 ppm for a fixed nitrogen content (N), and the Nb-content, comprised between 50 ppm and 100 ppm, is fixed so that no substantial precipitation of niobium carbides will occur during the process.
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