PVD Coated Mill Rolls for Cold Rolling of Stainless Steel Strips: Tribological and Mechanical Laboratory Tests

Choumad Ould (1) , Xavier Badiche (2) , Pierre Montmitonnet (1) , Yves Gachon (2)

1 CEMEF - Centre de Mise en Forme des Matériaux
2 HEF R&D

The cost of rolling is determined in particular by productivity (i.e. reduction per pass and speed) and lifetime of rolls before regrinding. Adhesive wear of the sheet gives rise to transfer on the roll surface (called "roll-coating" or "pick-up"). Its occurrence depends on rolling conditions (load, speed, temperature, lubrication) and is one of the determining factors of the maximal reduction for a given rolling speed. Abrasive wear of the roll is the second factor for roll lifetime. Both phenomena are strongly related to tribological and mechanical characteristics of the surface layer of rolls. Stainless steel is known for its high adhesiveness. As, furthermore, a good surface finish is needed, transfer is the main reason for frequent roll changes. Coatings with good tribological properties (anti-wear and first of all, anti-adhesive) could help extend the roll service. In the present paper, the potential of different PVD coatings (CrN, TiN and TiBN) is explored. The impact of these coatings on influential phenomena during rolling is analysed thanks to well adapted tribological and mechanical laboratory tests. The results show that TiN has a good potential in cold rolling of stainless steel strips.

Mots clés: Strip rolling; Stainless steel; TiN PVD Coating; TiBN; CrN

Domaines: Matériaux

Choumad Ould, Xavier Badiche, Pierre Montmitonnet, Yves Gachon. PVD Coated Mill Rolls for Cold Rolling of Stainless Steel Strips: Tribological and Mechanical Laboratory Tests. 40th NAMRC - North American Manufacturing Research Conference, Jun 2012, Notre-Dame, Indiana, United States. pp.234-243. ⟨hal-00724779⟩