ISSN (print) 1995-2732
ISSN (online) 2412-9003


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DOI: 10.18503/1995-2732-2021-19-2-32-39


Problem statement (relevance of the research). When manufacturing castings of pipeline valve body parts from corrosion-resistant steel grade 12Kh18N9TL within the GOST limits, there is instability of its mechanical properties and the lack of homogeneity of the structure (a ferritic phase in the structure amounting to 20%), resulting in a decrease in the intergranular corrosion resistance and performance properties. The research paper analyzes the influence of the chemical composition of steel grade 12Kh18N9TL on the mechanical properties and the content of the ferritic phase using a statistical analysis. It is noted that the mechanical properties and the ferrite content of the steel grade under study significantly vary depending on the chemical composition of steel within the GOST limits. The optimal properties and performance characteristics of the castings made of the steel grade under study are achieved, when the content of the ferritic phase doesn’t exceed 5%. Therefore, improving the mechanical properties stability and the structure of critical duty castings made of austenitic steel grade 12Kh18N9TL is the most important issue, and the solution of this problem requires the chemical composition optimization. Methods applied. To determine the nature and rate of the influence of the chemical composition on the mechanical properties and the content of the ferritic phase, the correlation and regression analysis was used. The chemical composition of steel grade 12Kh18N9TL was optimized by the steepest ascent method. Originality. We designed the mathematical models that predict the mechanical properties and the content of the ferritic phase for the given chemical composition. Result. We compared the matching and partial correlation coefficients of the influence of the chemical composition on the mechanical properties and the ferrite content of steel. Graphical diagrams were built to show the influence of the titanium and aluminum ratio on the mechanical properties and the content of the ferritic phase. Practical relevance. The chemical composition of corrosion-resistant austenitic steel has been optimized within the GOST limits to provide the required content of the ferritic phase. The results of the research may be valuable for manufacturing castings from corrosion resistant steel 12Kh18N9TL.


Chemical composition, corrosion-resistant steel, casting, ferritic phase, correlation and regression analysis.

For citation

Ganeev A.A., Ramazanov A.K. Optimization of a Chemical Composition of Corrosion-Resistant Steel 12KH18N9TL for Pipeline Valve Castings. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2021, vol. 19, no. 2, pp. 32–39.

Almir A. Ganeev – DrSc (Eng.), professor Ufa State Aviation Technical University, Ufa, Russia.

Azat K. Ramazanov – Deputy Head of the Steel Foundry Shop, JSC Blagoveshchensk Valves Plant, Blagoveshchensk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

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