DUPLEX STAINLESS STEEL RESISTANT TO CORROSION

• Main Authors: LOPEZ FERNANDEZ ALEJANDRA, RODRIGUEZ MARTIN RAQUEL
• Format: Patent
• Language: Chinese; English
• Published: 30.10.2020
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; PERFORMING OPERATIONS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention is directed to a duplex stainless steel alloy which contains the following elements, in % by weight with respect to the total weight of the composition: C: 0.001% to 0.03%; Si: 0.001% to 0.5%; Mn: 0.001% to 2.5%; Cr: more than 30.0% up to 35.0%; Ni: 5.5% to 8.0%; Mo: 2.0%to 2.5%; W: 2.5% or less; Co: 0.01% to 0.8%; N: 0.3% to 0.6%; Cu: 0.001% to1.0%; having one or more of thefollowing: Ca: 0.0040% or less; Mg: 0.0040% or less; one or more rare earth elements in a total amount of 0.1% or less; the remainder being Fe and unavoidable impurities; and wherein the relationshipCRC =.062*(Ni + Co) + 4.185*Mo is between 14.95 and 19.80. The duplex stainless steel alloy displays a high resistance to corrosion and is especially suitable for use in the production 10 of urea. 本发明涉及一种双相不锈钢合金，其含有以相对于组成的总重量的重量％计的以下元素：C：0.001％至0.03％；Si：0.001％至0.5％；Mn：0.001％至2.5％；Cr：大于30.0％至最多35.0％；Ni：5.5％至8.0％；Mo：2.0％至2.5％；W：2.5％或更少；Co：0.01％至0.8％；N：0.3％至0.6％；Cu：0.001％至1.0％；具有以下一种或多种：Ca：0.0040％或更少；Mg：0.0040％或更少；总量为0.1％或更少