Abstract
To increase the crack resistance of tire materials in hydrogen media, one adds admixtures of lanthanum (up to 0.05 vol. %) and cerium (up to 0.1 vol. %) to nitrogen-containing 18Mn-4Cr and 18Mn-18Cr steels in the process of experimental melting to refine, modify, and alloy these steels. These admixtures have a positive effect on the amount, form, and uniformity of the distribution of nonmetallic inclusions, qualitatively improve the state of the metal, and change its dislocation structure. The application of calcium (up to 0.05 vol. %) for deoxidation of steel leads to a considerable change in the form and composition of nonmetallic inclusions revealed in the investigation of the fracture surface of specimens. Experimental steels with a high content of chromium, copper, and other alloying elements demonstrate an increase in a resistance to corrosion-mechanical fracture and in long-term strength in a hydrogen medium.
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