Increasing the tensile strength and elongation of 16MnCrS5 steel using genetic programming

Abstract

[tore Steel Ltd. is one of the largest spring-steel producers in Europe. [tore Steel makes more than 1400 steel grades of different chemical composition. Among them is 16MnCrS5 steel. It is generally used for the fabrication of case-hardened machine parts for various applications (e.g., bars, rods, plates, strips, forgings), where a combination of wear resistance, toughness and dynamic strength is essential. These properties can be easily correlated with tensile strength, which depends on the chemical composition and heat treatment after rolling. In addition, the elongation should be taken into account. In the paper, modeling of tensile strength and elongation with genetic programming is presented and compared with linear regression modeling. The chemical composition data (content of C, Mn, S and Cr) and the heat-treatment regime data (GKZ or BG annealing) were used for modeling. The modeling results show that a higher tensile strength with improved elongation were achieved. Keywords: 16MnCrS5, tensile strength, elongation, modeling, genetic programming, linear regression [tore Steel je najve~ji proizvajalec vzmetnega jekla v Evropi. [tore Steel izdeluje ve~kot 1400 razli~nih kvalitet jekla z razli~nimi kemijskimi sestavami. Med njmi tudi 16MnCrS5, ki spada v skupino jekel za cementacijo, ki so namenjena za strojno obdelavo razli~nih delov (npr. palic, plo{~, trakov, odkovkov), kjer se zahteva kombinacija obrabne odpornosti,`ilavosti ter trajnonihajne trdnosti. Le-te lastnosti lahko povezujemo z natezno trdnostjo, ki je odvisna predvsem od kemi~ne sestave in toplotne obdelave po valjanju. Prav tako je pomemben raztezek. V~lanku je predstavljeno modeliranje natezne trdnosti in raztezka s pomo~jo genetskega modeliranja in linearne regresije. Za modeliranje smo uporabili vsebnosti kemijskih elementov (C, Mn, S in Cr) ter na~in toplotne obdelave (GKZ ali BG). Glede na rezultate smo pove~ali natezno trdnost pri izbolj{anem raztezku.

Reduction of Surface Defects and Optimization of Continuous Casting of 70MnVS4 Steel

“…In-house genetic programming system, programmed using AutoLISP, which is integrated into AutoCAD (i.e. commercial computer-aided design software), was used [31][32][33]. Genetic operations of reproduction and crossover were used.…”

Effect of the Service Temperature on the Strength Plasticity and Fracture Mechanism of Cr-Mo Casing Steel

“…The service environment of unconventional oil and gas resources is complex, and the service temperature ranges from room temperature to 350 ℃. The mechanical properties of casing materials at high temperature are significantly different from those at room temperature, and there will be many differences, such as the decrease of yield strength and the change of uniform elongation [5][6][7]. Therefore, the high temperature mechanical properties of casing materials are the design basis for the service safety of unconventional oil and gas wells, and the mechanical properties law with temperature change provides a strong basis for the strength check of unconventional oil and gas wells.…”