FERRITIC STAINLESS STEEL EXCELLENT IN Cu GRAIN BOUNDARY PERMEABILITY RESISTANCE DURING Cu BRAZING AND BRAZED JOINT

• Main Authors: NAKAMURA SADAYUKI, HORI YOSHIAKI, OKU MANABU
• Format: Patent
• Language: English; Japanese
• Published: 08.09.2016
• Subjects: ALLOYS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; FERROUS OR NON-FERROUS ALLOYS; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a stainless steel for Cu brazing having suppressed grain boundary permeability of Cu braze generated during Cu blazing while maintaining anticorrosion level which a stainless steel has and excellent in Cu grain boundary permeability resistance.SOLUTION: There is provided a ferritic stainless steel having a component composition containing, by wt.%, C:0.03% or less, Si:0.1 to 3.0%, Mn:0.1 to 2.0%, P:0.04% or less, S:0.003% or less, Cr:10.0 to 30.0%, Nb:0.3 to 0.8%, N:0.03% or less and the balance Fe with inevitable impurities, suppressing grain boundary depth of Cu braze with 5 μm or less from a boundary surface in a thickness direction and excellent in Cu grain boundary permeability resistance during Cu blazing.SELECTED DRAWING: Figure 1 【課題】ステンレス鋼が備える耐食性レベルを確保しつつ、Ｃｕろう付け時に発生するＣｕろうの粒界浸透が抑制された耐Ｃｕ粒界浸透性に優れたＣｕろう付け用のステンレス鋼を提供する。【解決手段】重量％で、Ｃ：０．０３％以下、Ｓｉ：０．１〜３．０％、Ｍｎ：０．１〜２．０％、Ｐ：０．０４％以下、Ｓ：０．００３％以下、Ｃｒ：１０．０〜３０．０％、Ｎｂ：０．３〜０．８％、Ｎ：０．０３％以下を含有し、残部はＦｅ及び不可避的不純物からなる成分組成であり、Ｃｕろうの粒界浸透深さを厚み方向で界面から５μｍ以下に抑制する、Ｃｕろう付け時の耐Ｃｕ粒界浸透性に優れたフェライト系ステンレス鋼。【選択図】図１