STEEL SHEET FOR HOT STAMPING, AND HOT STAMPING FORMED PART USING THE SAME

• Main Authors: OKITA KEISUKE, NAITO JUNYA, PICHLER ANDREAS, MURAKAMI TOSHIO, KURZ THOMAS, SATO SHINJI, IKEDA CHIKAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 20.06.2016
• Subjects: ALLOYS; CHEMISTRY; 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; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a steel sheet for hot stamping that can, while effectively securing the hardenability improving effect of the B addition even without the addition of Ti, improve the bendability after the processing.SOLUTION: The inventive steel sheet for hot stamping contains C: 0.1 to 0.4%, Si: 0% or more and 2.0% or less, Mn: 0.5 to 3.0%, P: 0.015% or less, S: 0.01% or less, B: 0.0003 to 0.01%, N: 0.05% or less, and Al in relation to Si content, in which Ti, Zr, Hf and Ta among the unavoidable impurities are each suppressed to 0.005% or less, as well as the nitride-based inclusions having circle equivalent diameter of 1 μm or more satisfy less than 0.10 per 1 mm.SELECTED DRAWING: None 【課題】Ｔｉを添加しなくてもＢ添加による焼入れ性向上作用を有効に確保しつつ、加工後の曲げ性を向上し得るホットスタンプ用鋼板を提供する。【解決手段】本発明のホットスタンプ用鋼板は、Ｃ：０．１〜０．４％、Ｓｉ：０％以上２．０％以下、Ｍｎ：０．５〜３．０％、Ｐ：０．０１５％以下、Ｓ：０．０１％以下、Ｂ：０．０００３〜０．０１％、Ｎ：０．０５％以下、ＡｌをＳｉ量との関係で含み、不可避的不純物のうちＴｉ、Ｚｒ、Ｈｆ、Ｔａはそれぞれ、０．００５％以下に抑制されていると共に、円相当直径１μｍ以上の窒化物系介在物が１ｍｍ2当り０．１０個未満を満足する。【選択図】なし