Technical information i 4.12. Regeneration - rake angle information Material Material Designationgroup ɣp [°] 800 10 – 13 P Steel FAN-1200 7 – 10 1400 5–7 M Stainless steel INOX 10 – 13 K Cast iron GG 4–6 7–9 N Non-ferrous materials GAL 10 – 13 4–6 heat-resistant alloys, S titanium alloys 1400 5–7 H Hard materials HRC50 -5 – -4 12 295