CLAD STEEL PLATE AND METHOD OF PRODUCING THE SAME

• Main Authors: ANDO JUMPEI, TSUGE SHINJI, KAWA MACHI, INUZUKA JUMPEI
• Format: Patent
• Language: English; Japanese
• Published: 08.10.2020
• Subjects: ALLOYS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MACHINE TOOLS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WELDING; WORKING BY LASER BEAM

To provide a clad steel plate having both strength and corrosion resistance and capable of omitting solution heat treatment, and also to provide a method of producing the same.SOLUTION: A clad steel plate according to the present invention uses a duplex stainless steel as a lamination material, which has the balance Fe with inevitable impurities, and is clad with a steel sheet ensuring strength, thereby enabling a steel plate having both strength and corrosion resistance even solution treatment is omitted, the duplex stainless steel comprising: C: 0.03% or less, Si: 0.05-1.0%, Mn: 0.1-4.0%, P: 0.05% or less, S: 0.005% or less, Cr: 20.0-28.0%, Ni: 4.0-8.0%, Mo: more than 2.5%-5.0%, W: 0-1.5%, N: 0.08-0.30%, and oxygen: 0.001-0.006%, with the balance comprising Fe and impurities, and the duplex stainless steel satisfying Formulae 1, 2, and 4. εmax=0.0035-Tσ*2.63*10-6 (Formula 1). Tσ=4Cr+25 Ni+71(Mo+W)-11.4(Mo-1.3)*(Mo-1.3)+5Si-6Mn-30 N+569(°C) (Formula 2). PREW=Cr+3.3(Mo+0.5 W)+16 N (Formula 4).SELECTED DRAWING: None 【課題】本発明は、強度と耐食性を併せ持ち固溶化熱処理を省略できるクラッド鋼板およびその製造方法を提供することを目的とする。【解決手段】Ｃ：０．０３％以下、Ｓｉ：０．０５〜１．０％、Ｍｎ：０．１〜４．０％、Ｐ：０．０５％以下、Ｓ：０．００５％以下、Ｃｒ：２０．０〜２８．０％、Ｎｉ：４．０〜８．０％、Ｍｏ：２．５％超〜５．０％、Ｗ：０〜１．５％ 、Ｎ：０．０８〜０．３０％、酸素：０．００１〜０．００６％であって、式1、式２、式４を満足し、残部Ｆｅおよび不純物である二相ステンレス鋼を合わせ材とし、強度を担保する鋼板とクラッドしたクラッド鋼板により、固溶化熱処理を省略しても強度と耐食性を持ち合わせた鋼板を得ることができる。 εｍａｘ＝０．００３５−Ｔσ＊２．６３＊１０−６ （式１） Ｔσ＝４Ｃｒ＋２５Ｎｉ＋７１（Ｍｏ＋Ｗ）−１１．４（Ｍｏ−１．３）＊（Ｍｏ−１．３）＋５Ｓｉ−６Ｍｎ−３０Ｎ＋５６９（℃） （式２） ＰＲＥＷ＝Ｃｒ＋３．３（Ｍｏ＋０．５Ｗ）＋１６Ｎ (式４)【選択図】なし