DOI: 10.18503/1995-2732-2022-20-4-95-101
Abstract
The current materials market dictates the need for maintaining an acceptable balance of interests between producers and consumers. This is especially true when mastering the production processes of products with an increased level of consumer properties. One of the highly profitable types of cold-rolled steel products is rolled products for enameling from 08YuR steel grade (as per the Russian Standard). Consumer requirements for such products provide for the exclusion of a “fish scale” defect in the finished enameled product. In Russian practice, to assess the probability of this defect, the hydrogen embrittlement (HE) index is used as stated in the regulatory documents. At the same time, the existing quality assessment indicator for rolled steel products does not fully characterize the tendency of rolled products to develop the “fish scale” defect, which is attributed to the peculiarities of the methods for its determination, including the influence of the human factor. Scientists of Nosov Magnitogorsk State Technical University (NMSTU) and special-ists of PJSC Magnitogorsk Iron and Steel Works (PJSC MMK) proposed a new indicator of the quality of rolled steel products for enameling, namely the volume fraction of structurally free cementite, to assess the tendency of rolled products to cause “fish scales”, and developed the methods for its determination. The developed indicator contributes to forming a clear opinion on the tendency of rolled steel products to hydrogen trapping and fully correlates with the hydrogen embrittlement values. The authors determined the threshold range of such values, excluding the defect in the enameled product. The developed methodology served as a basis for identifying root causes for the “fish scale” defect and ways to minimize it, when manufacturing rolled products for enameling. In particular, when organizing the hot rolling process, new technological solutions were proposed for cooling the steel surface on the discharge roller table of a hot rolling mill. The developed new end-to-end technology for rolled steel products from 08YuR steel grade (as per the Russian Standard) ensures the yield of 99.8%.
Keywords
cold rolled steel products, enameling, microstructure, properties, hydrogen trapping, quality
For citation
Golubchik E.M., Chikishev D.N. Development of a New Indicator for Assessing the Quality of Rolled Steel Prod-ucts for Enameling and Methods for Its Determination. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2022, vol. 20, no. 4, pp. 95-101. https://doi.org/10.18503/1995-2732-2022-20-4-95-101
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