There is a bright future for hard cutting technique because of good machining flexibility, high efficiency, no pollution. This paper presents effect rules of cutting parameters (cutting speed, feed, depth of cutting) on integrality of machined surface (surface roughness, surface hardness, surface hardened depth, residual stresses, surface texture) based on orthogonal ization test. Optimal cutting parameters are selected according to these rules. Surface roughness (R-a) is up to 0.6mum in terms of selected optimal cutting parameters.