Low-alloy steel for the making of plastic or rubber moulds

C - Chemistry – Metallurgy – 22 – C

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C22C 38/22 (2006.01) B29C 33/38 (2006.01) C22C 38/32 (2006.01) C22C 38/40 (2006.01) C22C 38/54 (2006.01) C22C 38/60 (2006.01)

Patent

CA 2161740

Acier faiblement allié pour la fabrication de moules pour matières plastiques ou pour caoutchouc dont la composition chimique comprend en poids de 0,24% à 0,35% de Carbone, de 1 % à 2,5% de Manganèse, de 0,3% à 2,5% de Chrome, de 0,1 % à 0,8% de Molybdène plus Tungstène divisé par 2, jusqu'à 2,5% de Nickel, de 0% à 0,3% de Vanadium, moins de 0,5% de Silicium, de 0,002% à 0,005% de Bore, de 0,005% à 0,1 % d'Aluminium, de 0% à 0,1 % de Titane, moins de 0,02% de Phosphore. La composition chimique devant satisfaire en outre à la relation : U =409(%C) + 19,3[%Cr+ %Mo + %W/2+ %V] + 29,4(%Si) + 10(%Mn) + 7,2(%Ni) < 200 et à la relation : R=3,82(%C)+9,79(%Si)+3,34(%Mn) +11,94(%P) + 2,39(%Ni) + 1,43(%Cr) + 1,43(%Mo + %W/2) < 11,14

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