Horlogerie et produits de luxe

BÖHLER A224 est un acier inoxydable austénitique Cr-Ni-Mo à faible teneur en carbone. Résiste à la corrosion intergranulaire jusqu’à 400°C. Traitement thermique après soudage non nécessaire. Bonne résistance aux acides réducteurs, tels que les acides sulfurique et chlorhydrique dilués, et à la corrosion localisée dans les milieux contenant des chlorures. Finition de surface requise décapé. Très bonne aptitude au formage à froid, au polissage miroir.

BÖHLER L035 is a 35-cobalt-35-nickel-20-chromium-10-molybdenum wrought alloy (UNS R30035) used for the production of surgical implants. This alloy composition has been successfully used in human implants. Long-term clinical experience has shown an acceptable biological response. The exceptional properties of BÖHLER L035 result from its chemical composition, high-quality melting technology, cold forming and heat treatment. It is a vacuum induction melted (VIM) and vacuum arc remelted (VAR) superalloy. BÖHLER L035 is a nickel-cobalt based multiphase alloy system with a unique combination of properties e.g. extremely high strength, toughness, ductility and excellent corrosion resistance. The alloy can be strengthened and aged in the factory to achieve strength values of max. 260 to 300 ksi (1793-2086 MPa) and stress corrosion cracking (SCC) resistance even in hydrogen sulphide. The BÖHLER L035 alloy resists pitting and crevice corrosion caused by seawater, chloride solutions and other corrosive environments, e.g. mineral acids (nitric, hydrochloric, sulphuric acid).

BÖHLER P558 is a high-nitrogen 11% manganese-17% chromium-3% molybdenum-nickel stainless steel for surgical implants. Its metallurgical requirements include a fine-grained, austenitic microstructure without delta ferrite, low inclusion content, and resistance to intergranular corrosion. BÖHLER P558 also exhibits pitting and crevice corrosion resistance that is significantly better than the reference material in Specification F138 and exceeds the material values ​​specified in Specification F1314 and Specification F1586. Biocompatibility tests for this material have been positive and meet the requirements of the test standards used. The chemical composition of this steel features a high carbon content, along with high nitrogen content. The high carbon content is considered critical in the conventional metallurgy of chromium-nickel stainless steels, but the simultaneous alloying of nitrogen and carbon in BÖHLER P558 has a beneficial effect on the stabilization of the austenitic phase, extends the range of austenite stability to lower solution annealing temperatures, increases corrosion resistance, and leads to better toughness properties.