The characteristics of homogeneity and workability of Arvedi hot stretch reduced tubes are enhanced in the heavy wall mechanical tubes (GSM®) where the ratio between wall thickness and diameter is pushed to ratios of over 30%. GSM tube presents a smooth internal surface without the welding bead, even for small diameter and heavy wall products, as it is rolled from a large diameter welded tube from which the bead has been removed. GSM is therefore suitable for cold drawing and for all mechanical processing’s which require a good internal tube surface. The peculiarity of Arvedi process is due to the rolling of HFI welded mother shell on stretch reducing mill. The Arvedi mother shell is not obtained from billet “piercing” (as for seamless process). In addition, the Arvedi mother shell starts from a strip with limited thickness variations. All these peculiarities guarantee superior geometrical characteristics, negligible and limited internal polygonality of tubes produced. Synergy with Acciaieria Arvedi allows it to develop new products made with special steels and aimed at specific projects. The production line from the steel to the finished and pre-processed tube responds with ideas and solutions, even personalised ones, to the most varied demands. ARVEDI LC®/GSM vs SEAMLESS ARVEDI GSM® TUBES ECCENTRIC SEAMLESS CONCENTRIC ARVEDI LC/GSM eccentricity absent or negligible both in the cross section and along the tube length 5
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