20th International Forgemasters Meeting - IFM 2017

Production of calibrated rolls for steel industry in the Forge Division began in 70’s and have lasted incessantly. Rolls made of forged steel are able to work in extreme conditions and can transfer heavy loads. In the past few years technology of roll production has changed in Forge Division of CELSA Huta Ostrowiec. Now we are able to offer rolls with improved properties. We produced mostly rolls with flat barrel but now we produce rolls with calibers as well. Main change was to adopt shape of forge to be closer to the final shape (near calibres). Using this technology “calibre contour forging” we are able to form the celibres without cutting the natural grain flow in addition to high inner consistency provided by the 80MN forging press. Then we carry out Heat Treatment process after machined rolls with optimum allowances. Thereby we are able to obtain a layer with the best properties on celibres with the heaviest loads. These are the benefits which we can obtain using this technology: efficient heat treatment , better hardness on calibres’ surface, better resistance of calibres’ during rolling and longer lifetime. Furthermore, our engineers developed special grades, called CERLO, which are used to produce calibrated rolls for our clients. Hardness can achieve 375HB but tensile strength even 1100MPa with bainite tempered structure.