5 ARVEDI GSM® TUBES ARVEDI LC®/GSM vs SEAMLESS 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 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 whose bead has been removed. GSM is therefore suitable for cold drawing and for all mechanical processing’s which require a good internal tube surface. Welding Relations The uniqueness 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 is generated from a strip with limited thickness variations. All these peculiarities guarantee superior geometrical characteristics and negligible or limited internal polygonality. Synergy with Acciaieria Arvedi allows 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. ECCENTRIC SEAMLESS CONCENTRIC ARVEDI LC/GSM eccentricity absent or negligible both in the cross section and along the tube length
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