HIGH-STRENGTH STEEL WIRE

• Main Authors: SAKAMOTO AKIRA, KODAMA JUNICHI, OFUJI YOSHIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 11.04.2019
• 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

To provide a high-strength steel wire of a hypereutectoid composition, the steel wire having excellent strength and ductility.SOLUTION: A high-strength steel wire comprises, in mass%, C: 0.90-1.10%, Si: more than 0.40% to 0.80% or less, Mn: 0.10-0.70%, and Cr: 0.10-0.40%, with Al: 0.003% or less, P: 0.020% or less, and S: 0.010% or less, and [Si+Cr] of 0.50-0.90% and [Cr+Mn] of 0.40-0.80%, with the balance being Fe and inevitable impurities. The steel wire has a wire diameter of 0.05-0.30 mm. The steel wire has a plurality of exothermic peaks in the temperature range of 100-450°C in a DSC curve of differential scanning calorimetry. The sum of calorific values Hin the temperature range of 100-450°C and calorific values Hin the temperature range of 280-420°C satisfy the following formulae (3): H/H<0.45.SELECTED DRAWING: Figure 1 【課題】過共析組成の鋼線において、強度および延性に優れた高強度鋼線を提供する。【解決手段】質量％で、Ｃ：０．９０〜１.１０％、Ｓｉ：０．４０％超０．８０％以下、Ｍｎ：０．１０〜０．７０％、Ｃｒ：０．１０〜０．４０％を含有し、Ａｌ：０．００３％以下、Ｐ：０．０２０％以下、Ｓ：０．０１０％以下に制限し、かつ「Ｓｉ＋Ｃｒ」が０．５０〜０．９０％、「Ｃｒ＋Ｍｎ」が０．４０〜０．８０％であり、残部はＦｅおよび不可避の不純物よりなり、線径が直径で０．０５〜０．３０ｍｍで、示差走査熱量測定のＤＳＣ曲線における１００〜４５０℃の温度範囲において、複数の発熱ピークを有し、かつ、１００〜４５０℃の温度範囲における発熱量の総和Ｈ１００〜４５０と２８０〜４２０℃の温度範囲における発熱量Ｈ２８０〜４２０が、下記式（３）を満足する。Ｈ２８０〜４２０／Ｈ１００〜４５０＜０．４５ ・・・（３）【選択図】図１