FERRITIC STAINLESS STEEL EXCELLENT IN BRAZABILITY AND CORROSION RESISTANCE, AND Ni BRAZED JOINT MEMBER

• Main Authors: ABE MASATOSHI, HIRAIDE NOBUHIKO
• Format: Patent
• Language: English; Japanese
• Published: 08.11.2018
• Subjects: ALLOYS; BLASTING; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION; FERROUS OR NON-FERROUS ALLOYS; HEAT EXCHANGE IN GENERAL; HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT; HEATING; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a ferritic stainless steel that can suitably be used as a member to be assembled by brazing joining such as a heat exchanger or the like, and is excellent in brazability, corrosion resistance, processability and toughness of Ni brazed joint portion, and to provide a Ni brazed joint member.SOLUTION: Provided is a ferritic stainless steel excellent in brazability and corrosion resistance characterized in having a chemical composition containing, by mass%, C: 0.020% or less, Si: 1.0 to 3.5%, Mn: 0.02 to 0.80%, Cr: 10.5 to less than 15.0%, Nb: 0.03 to 0.60%, Al: 0.050% or less, and N: 0.025% or less and the balance is composed of Fe and unavoidable impurities, and in which the pitting potential V'c100 in a 3.5 mass% NaCl aqueous solution at 30°C is 150 mV or more.SELECTED DRAWING: None 【課題】熱交換器等ろう付け接合により組み立てられる部材に好適に用いることができ、ろう付け性、耐食性、加工性およびＮｉろう付け継手部の靭性に優れたフェライト系ステンレス鋼およびＮｉろう付け接合部材を提供する。【解決手段】質量％で、Ｃ：０．０２０％以下、Ｓｉ：１．０超え〜３．５％、Ｍｎ：０．０２〜０．８０％、Ｃｒ：１０．５〜１５．０％未満、Ｎｂ：０．０３〜０．６０％、Ａｌ：０．０５０％以下、Ｎ：０．０２５％以下を含有し、残部がＦｅおよび不可避的不純物からなる化学組成を有し、３０℃の３．５質量％ＮａＣｌ水溶液中における孔食電位Ｖ'c100が１５０ｍＶ以上であることを特徴とするろう付け性と耐食性に優れたフェライト系ステンレス鋼。【選択図】なし