This paper deals with twist resulting in two kinds of high strength steel sheet hat channel products consisting of straight portion combined with curved portion in the longitudinal direction. Type-A product is flat. Type-B product is circularly curved in the hight direction. Every type product has unique characteristics in the shape inaccuracy. It could be deduced that twist in type A was mainly generated from residual moment in the curvature of side wall part, and one in type B was mainly generated from residual moment on punch shoulder part.
