Inštitut za kovinske materiale in tehnologije, Ljubljana (IMTLJ)
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13.
Industrial test of protective coating = Industrijski preskus varovalnega premaza
Torkar, Matjaž ; Drenovec, Marko ; Marolt, Tone, inženir
Springs are sensitive to the quality of steel surface that should not be decarburised. Protective coating was developed for diminution of scaling and decarburisation of steel billets during heating. ...Presented are results of industrial test of protective coating on steel 51CrMoV4 for springs. For industrial test two billets 180 x 180 mm with grinded surface were protected by coating, the third billet with grinded surface was not protected. The billets were charged into reheating furnace and after heating rolled into profile 145 x 145 mm. From rolled profile the samples were cut for metallography. Investigations revealed that the surface of profile, rolled from billet with grinded surface was decarburised on all four surfaces. Comparison with profile rolled from grinded and protected billets revealed that surface was not decarburised, only traces of ferrite on grain boundaries were observed. That means the protective coating diminished decarburisation of steel surface. Industrial tests on grinded billets of 51CrMoV4 steel without and with protective coating confirmed beneficial influence of protective coating on diminution of decarburisation of billets during reheating process. Similar effect was observed in profile hot rolled from 180 x 180 mm billet to 145 x 145 mm profile. Based on sucessful trials steelwork Štore Steel decided to establih industrial device for application of protective coating during regular production process.
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