Abstract
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.
