Technical Datasheets for Stainless Steel - Martensitic Stainless Steel - Martensitic 1.4005 (416) Bar 1.4005 / 416 Martensitic Stainless Steel 1.4006 Bar Grade 410 / 1.4006 is a hardenable martensitic stainless steel available in bar form only. 1.4021 (420) Bar 1.4021 / 420 Free Machining Martensitic Stainless Steel 1.4125 (440C) Bar 1.4125 / 440C Martensitic Stainless Steel