MARTENSITIC STAINLESS STEEL, METHOD FOR PRODUCING A SEMI-FINISHED PRODUCT MADE FROM SAID STEEL AND CUTTING TOOL PRODUCED FROM SAID SEMI-FINISHED PRODUCT

• Main Authors: HAEGELI, Françoise, CHASSAGNE, Francis
• Format: Patent
• Language: English; French
• Published: 03.11.2016
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

martensitic stainless steel, characterised in that the composition thereof is, in percentage by weight: 0.10% ≤ C ≤ 0.45%; traces ≤ Mn ≤ 1.0%; traces ≤ Si ≤ 1.0%; traces ≤ S ≤ 0.01 %; traces ≤ P ≤ 0.04%; 15.0% ≤ Cr ≤ 18.0%; traces ≤ Ni ≤ 0.50%; traces ≤ Mo ≤ 0.50%; traces ≤ Cu ≤ 0.50%; traces ≤ V ≤ 0.50%; traces ≤ Nb ≤ 0.03%; traces ≤ Ti ≤ 0.03%; traces ≤ Zr ≤ 0.03%; traces ≤ Al ≤ 0.010%; traces ≤ O ≤ 0.0080%; traces ≤ Pb ≤ 0.02%; traces ≤ Bi ≤ 0.02%; traces ≤ Sn ≤ 0.02%; 0.10%≤ N ≤ 0.20%; C + N ≥ 0.25%; preferably C + N ≥ 0.45%; Cr + 16 N - 5 C ≥ 14.0%; preferably Cr + 16 N - 5 C ≥ 16%; the remainder being iron and impurities resulting from the production. Method for producing a semi-finished product from said martensitic stainless steel, and cutting tool produced from said semi-finished product. Acier inoxydable martensitique, caractérisé en ce que sa composition est, en pourcentages pondéraux : 0,10%≤ C ≤ 0,45%; traces≤ Mn ≤ 1,0%; traces≤ Si ≤ 1,0%; traces≤ S ≤ 0,01 %; traces≤ P ≤ 0,04%; 15,0%≤ Cr ≤ 18,0%; traces≤ Ni ≤ 0,50%; traces≤ Mo ≤ 0,50%; traces≤ Cu ≤ 0,50%; traces≤ V ≤ 0,50%; traces≤ Nb ≤ 0,03%; traces≤ Ti ≤ 0,03%; traces≤ Zr ≤ 0,03%; traces≤ Al ≤ 0,010%; traces≤ O ≤ 0,0080%; traces≤ Pb ≤ 0,02%; traces≤ Bi ≤ 0,02%; traces≤ Sn ≤ 0,02%; 0,10%≤ N ≤ 0,20%; C + N ≥ 0,25%; de préférence C + N ≥ 0,45%; Cr + 16 N - 5 C ≥ 14,0%; de préférence Cr + 16 N - 5 C ≥ 16%; le reste étant du fer et des impuretés résultant de l'élaboration. Procédé de fabrication d'un demi-produit en cet, acier inoxydable martensitique, et outil de coupe réalisé à partir de ce demi-produit.