CONTAINED IN DIN HDBK 402 Covers cold reduced flat products (strip and lengths cut from it), without coating, in widths not exceeding 650 mm and thicknesses up to 6 mm, made from mild unalloyed steels as specified in table 1. The steels are suitable for forming and surface refinement, but not for quench hardening or for quenching and tempering. They may be case hardened, but only the steels specified in DIN 17210 may be assumed to be suitable for this purpose, and these are not covered in the present standard.