20.500.12556/DKUM-92237 Modeling of tensile test results for low alloy steels by linear regression and genetic programming taking into account the non-metallic inclusions Štore Steel Ltd. is one of the biggest flat spring steel producers in Europe. The main motive for this study was to study the influences of non-metallic inclusions on mechanical properties obtained by tensile testing. From January 2016 to December 2021, all available tensile strength data (472 cases–472 test pieces) of 17 low alloy steel grades, which were ordered and used by the final user in rolled condition, were gathered. Based on the geometry of rolled bars, selected chemical composition, and average size of worst fields non-metallic inclusions (sulfur, silicate, aluminium and globular oxides), determined based on ASTM E45, several models for tensile strength, yield strength, percentage elongation, and percentage reduction area were obtained using linear regression and genetic programming. Based on modeling results in the period from January 2022 to April 2022, five successively cast batches of 30MnVS6 were produced with a statistically significant reduction of content of silicon (t-test, p < 0.05). The content of silicate type of inclusions, yield, and tensile strength also changed statistically significantly (t-test, p < 0.05). The average yield and tensile strength increased from 458.5 MPa to 525.4 MPa and from 672.7 MPa to 754.0 MPa, respectively. It is necessary to emphasize that there were no statistically significant changes in other monitored parameters. mechanical properties tensile test tensile strength yield strength percentage elongation percentage reduction area low alloy steel modeling linear regression genetic programming industrial study steel making optimization mehanske lastnosti natezni preskus natezna trdnost napetost tečenja odstotek raztezka odstotno območje zmanjšanja napetosti nizko legirano jeklo modeliranje linearna regresija genetsko programiranje industrijske študije izdelava jekla optimizacija true false true MDPI AG Angleški jezik Slovenski jezik https://www.mdpi.com/journal/metals © 2022 by the authors Članek v reviji 2025-03-24 12:08:44 2025-03-24 12:08:44 2025-03-25 03:09:41 0000-00-00 00:00:00 2022 0 0 Str. 1-17 iss. 8 (1343) Vol. 12 Aug. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2022-06-30 2022-08-09 2022-08-12 669.1:004.9 118540547 10.3390/met12081343 2075-4701 metals-12-01343-v4.pdf metals-12-01343-v4.pdf 1 C3147D0C9E3C072679F7E803D002486A e4ab860356b6fdba66f0eb4622154648581bb0f144d932b7af3c64c7693c4d39 bbb3b2ee-08a0-11f0-b559-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=189599 https://www.mdpi.com/2075-4701/12/8/1343 0 c284e2f0-08a0-11f0-b559-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=189600 Fakulteta za strojništvo 0 0 0