Stainless austenitic low Ni alloy

• Main Authors: SÖDERMAN, ANDERS, NYLÖF, LARS
• Format: Patent
• Language: English; Polish
• Published: 31.08.2016
• 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

An austenitic stainless steel alloy having the following composition in percent of weight (wt%): 0.02 ‰¤ C ‰¤ 0.06 Si < 1.0 2.0 ‰¤ Mn ‰¤ 6.0 2.0 ‰¤ Ni ‰¤ 4.5 17 ‰¤ Cr ‰¤ 19 2.0 ‰¤ Cu ‰¤ 4.0 0.15 ‰¤ N ‰¤ 0.25 0 ‰¤ Mo ‰¤ 1.0 0 ‰¤ W ‰¤ 0.3 0 ‰¤ V ‰¤ 0.3 0 ‰¤ Ti ‰¤ 0.5 0 ‰¤ Al ‰¤ 1.0 0 ‰¤ Nb ‰¤ 0.5 0 ‰¤ Co ‰¤ 1.0 the balance Fe and normally occurring impurities, characterized in that the contents of the alloying elements are balanced so that the following conditions is fulfilled: Ni eqv -1.42*Cr eqv ‰¤ -13.42, wherein Cr eqv = % Cr + 2 * % Si + 1.5 * % Mo + 5 * % V + 5.5 * % Al + 1.75 * % Nb + 1.5 * % Ti + 0.75 * % W Ni eqv = % Ni + % Co + 0.5 * % Mn + 0.3 * % Cu + 25 * % N + 30 * % C and -70 °C < MD30 < -25 °C,wherein MD ¢ 30 = 551 - 462 * % C + % N - 9.2 * % Si - 8.1 * % Mn - 13.7 * % Cr - 29 * % Ni + % Cu - 68 * % Nb - 18.5 * % Mo