烘烤硬化钢（BH 钢）是指采用特定化学成分和生产工艺是钢板中固溶一定的碳原子，钢板在交货状态下具有低的屈服 强度，冲压完成后，进行涂漆烘烤时屈服强度增加一定值的一种新型高效汽车用钢。BH 钢可以提高汽车外板的抗凹陷性， 同时又具有良好的成形性能。广泛应用于汽车门外板、发动机盖板等外覆盖件。 Bake hardening steel (BH steel) refers to steel added with some solid solution carbon atoms by adoption of special chemical compositions and production process. It is a new type of high-efficient automotive steel plates with relatively low yield strength at delivery and increased yield strength by certain extents through coating baking after draw forming. It is featured with good formability and stable bake hardness (BH value), and widely used for manufacturing cover plates of automobiles such as outside door plates and engine hood plates.