PT  - JOURNAL ARTICLE
AU  - Jurickova, Eva
AU  - Zemcik, Oskar
AU  - Kolomy, Stepan
AU  - Sedlak, Josef
AU  - Hrusecka, Denisa
AU  - Chromjakova, Felicita
AU  - Sliwkova, Petra
TI  - Effect of Machining on 3D Surface Texture and Scratch Resistance of Structural Steel
DP  - 2026 Mar 21
TA  - Manufacturing Technology Journal
PG  - 34--42
VI  - 26
IP  - 1
AID - 10.21062/mft.2026.004
IS  - 12132489
AB  - This study experimentally compares how three common machining routes, turning, milling and grinding, affect the surface texture and tribological response of three structural steels (C45, 42CrMo4, 30CrMoV9) under conditions where the profile roughness Ra is deliberately aligned across routes. Areal topography was measured by coherence correlation interferometry and evaluated according to ISO 25178 (height metrics Sa, Sq, Sp, Sv, Sz, St). The bearing area curve (Abbott-Firestone) was used to derive functional descriptors Rpk, Rk and Rvk. Scratch resistance was determined on a UMT‑3 tribometer (Rockwell 120°, P = 50 N) as HSp = 8.P / w<sup>2</sup> in accordance with ASTM G171. The results show that surfaces with comparable Ra can differ markedly in areal extremes and BAC‑derived parameters, which is reflected in scratch response. These findings support replacing sole Ra specification with areal and bearing‑curve descriptors when functional performance is critical (friction, sealing, wear).