Nickel-saving type super duplex stainless steel and preparation method thereof

• Main Authors: LIU QING, LIU LE, LI KUNFANG, LI JUN, YAO JINGJING, LIU GANG, LIN GENWEN, RAN QINGXUAN, XIAO XUESHAN
• Format: Patent
• Language: Chinese; English
• Published: 19.03.2014
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to nickel-saving type super duplex stainless steel and a preparation method thereof, belonging to the technical field of steel alloy materials. The super duplex stainless steel comprises the following components in percentage by weight: less than or equal to 0.03% of C, less than or equal to 0.01% of S, less than or equal to 0.01% of P, 30.0-34.0% of Cr, 10-16% of Mn, less than or equal to 4.0% of Ni, less than or equal to 1.0% of Si, 2-3% of Mo, 0.5-0.8% of N, 1-3% of W, 0.001-0.01% of B, 0.001-0.01% of Ca, 0.005-0.20% of rare earth Ce or Y and the balance of iron. By adopting a conventional melting process method, the super duplex stainless steel is prepared by the following steps: during charging, preparing a Fe-Ce intermediate alloy or an Fe-Y intermediate alloy in advance by adopting a method of sealing the intermediate alloy by a pure iron pipe; comprehensively proportioning and melting, pouring and forming; thermally forging and cold-rolling; then carrying out proper solution trea