Waelzholz’s PT-strip and RAWAEL® materials are both excellent choices for complex components with high tensile strength – since they are factory-produced with high strength and good formability, parts made from these grades do not need to be piece-hardened. This reduces the number of processing steps. In addition, eliminating piece hardening makes it possible to achieve extremely tight tolerances in the final product.
Complex formed components that need to have high tensile strength are often manufactured from soft materials and are subsequently piece-hardened. But this method has some drawbacks. On the one hand, piece hardening after forming is a cost-intensive additional processing step. On the other hand, heat treatment after forming always has a considerable impact on the form, positional, and dimensional tolerances. Waelzholz’s bainitically hardened and tempered PT-strip and micro-alloyed fine-grained steel RAWAEL® are two intelligent alternative materials. Both were developed to meet high load requirements – PT-strip and RAWAEL® offer tensile strengths beyond the 1,000 MPa (145 ksi) mark. Despite their strength, both materials are suitable for complex forming operations such as hole outlines with a collar or dome-shaped drawing, notches, and bead embossing. Thanks to their homogeneous microstructure, the differences between the cold rolled steel strip’s longitudinal and transverse directions are minimal. Figure 1 shows the various forming options possible with a sample application.