Vehicle-hinge profile steel: It is one kind of hot rolled section steel connecting automobile body and door. It adopts full-size hot rolling and one-time forming, with more than 100 specifications, and its application fields cover high, medium and low-grade major brand cars. Combined with rich steel rolling experience and advanced production and processing equipment, the product has good dimensional consistency and positional tolerance. The special surface treatment process is adopted in the hot rolling forming process, and the later coating effect is good. Customized High Strength Structural Low Alloy Steel S355/S390/S420 Vehicle-hinge profile steel