Austenitic-ferritic stainless steel having improved machinability

The invention relates to austenitic-ferritic stainless steel composition, the composition of which includes: 0.01 wt % ≤ C ≤ 0.10 wt %; 20.0 wt % ≤ Cr ≤ 24.0 wt %; 1.0 wt % ≤ Ni ≤ 3.0 wt %; 0.12 wt % ≤ N ≤ 0.20 wt %; 0.5 wt % ≤ Mn ≤ 2.0 wt %; 1.6 wt % ≤ Cu ≤ 3.0 wt %; 0.05 wt % ≤ Mo ≤ 1.0 wt %; W ≤...

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Bibliographische Detailangaben
Hauptverfasser:	BOURGIN, CHRISTOPHE, FANICA, AMELIE, PEULTIER, JEROME, RENAUDOT, NICOLAS, CHAUVEAU, ERIC, MANTEL, MARC
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES CHEMISTRY FERROUS OR NON-FERROUS ALLOYS FORGE FURNACES FORGING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HAMMERING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS POWDER METALLURGY PRESSING METAL PUNCHING METAL RIVETING ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The invention relates to austenitic-ferritic stainless steel composition, the composition of which includes: 0.01 wt % ≤ C ≤ 0.10 wt %; 20.0 wt % ≤ Cr ≤ 24.0 wt %; 1.0 wt % ≤ Ni ≤ 3.0 wt %; 0.12 wt % ≤ N ≤ 0.20 wt %; 0.5 wt % ≤ Mn ≤ 2.0 wt %; 1.6 wt % ≤ Cu ≤ 3.0 wt %; 0.05 wt % ≤ Mo ≤ 1.0 wt %; W ≤ 0.15 wt %; 0.05 wt % ≤ Mo +W/2 ≤ 1.0 wt %; 0.2 wt % ≤ Si ≤ 1.5 wt %; Al ≤ 0.05 wt %; V ≤ 0.5 wt %; Nb ≤ 0.5 wt %; Ti ≤ 0.5 wt %; B ≤ 0.003 wt %; Co ≤ 0.5 wt %; REM ≤ 0.1 wt %; Ca ≤ 0.03 wt %; Mg ≤ 0.1 wt %; Se ≤ 0.005 wt %; O ≤ 0.01 wt %; S ≤ 0.030 wt %; and P ≤ 0.040 wt %; the remainder being iron and impurities resulting from production, and the microstructure consisting of austenite and 35 to 65 vol % of ferrite. The composition also satisfies the following relations: 40 ≤ IF ≤ 65, where IF = 10 wt % Cr + 5.1 wt % Mo + 1.4 wt % Mn + 24.3 wt % Si + 35 wt % Nb + 71.5 wt % Ti - 595.4 wt % C - 245.1 wt % N - 9.3 wt % Ni - 3.3 wt % Cu - 99.8 and IRCGCU ≥ 32.0, where IRCGCU = wt % Cr + 3.3 wt % Mo + 2 wt % Cu + 16 wt % N + 2.6 wt % Ni - 0.7 wt % Mn and 0 ≤ IU ≤ 6.0, where IU = 3 wt % Ni + wt % Cu + wt % Mn - 100 wt % C - 25 wt % N - 2(wt % Cr + wt % Si) - 6 wt % Mo + 45. The invention also relates to a method for manufacturing sheets, strips, coils, bars, wires, profile sections, forged parts, and molded parts made of said steel.