Influence of metallurgical factors on the performance of IS:7887 Gr. 3 billets for fastener applications
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The quality advantages of continuous casting (concast) have enabled the production of a wide range of billets for various end applications, including IS:7887 Gr. 3 billets for the fastener industry. This paper discusses the influence of the internal quality of these concast billets on the processing of a wide range of products for the fastener industry. Internal soundness, inclusion volume fraction, and cleanliness were found to have a strong influence on the cracking susceptibility of self-tapping screws and nuts. A high incidence of hairline cracks on nut surfaces was found to be due to a combination of a high volume fraction of inclusions (0.54%) and the presence of complex manganese (Mn) (aluminate-silicate)-type inclusions.
Keywordsbillets cracks self-tapping screws wire rods
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