Fe-BASED ELECTRIC PLATING HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING THE SAME

• Main Authors: OKUMURA TOMOSUKE, HOSHINO KATSUYA, YAMAMOTO SHUNSUKE, MIYATA MAI, MAKISUI YOICHI, HOSHIMI RYOTA, OKUMURA TORU, KOBA MASATAKA
• Format: Patent
• Language: English; Japanese
• Published: 06.12.2022
• Subjects: ALLOYS; APPARATUS THEREFOR; CHEMISTRY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide an Fe-based electric plating high-strength steel sheet that has excellent chemical conversion properties and excellent corrosion resistance after coating and also has excellent resistance to delayed fracture.SOLUTION: An Fe-based electric plating high-strength steel sheet has: a Si-containing cold-rolled steel sheet that contains Si of 0.5 to 3.0 mass%; and an Fe-based electric plated layer that is deposited on at least one side of the Si-containing cold-rolled steel sheet with its amount of deposition being 1.0 to 20.0 g/m2 for each side. The content of in-steel diffusible hydrogen is 0.25 mass ppm or less.SELECTED DRAWING: None 【課題】優れた化成処理性及び塗装後耐食性を有するとともに、耐遅れ破壊特性に優れるＦｅ系電気めっき高強度鋼板を提供する。【解決手段】上記目的を達成するべく、本発明のＦｅ系電気めっき高強度鋼板は、Ｓｉを０．５～３．０質量％含む、Ｓｉ含有冷延鋼板と、該Ｓｉ含有冷延鋼板の少なくとも片面に形成された、片面あたりの付着量が１．０～２０．０ｇ／ｍ２である、Ｆｅ系電気めっき層と、を備え、鋼中拡散性水素の含有量が、０．２５質量ｐｐｍ以下であることを特徴とする。【選択図】なし