High strength copper alloy material having excellent shear workability and its production method

剪断加工性に優れる高強度銅合金材およびその製造方法

Abstract

<P>PROBLEM TO BE SOLVED: To provide a copper alloy material combining high mechanical strength and satisfactory electric conductivity, and also having excellent shear workability. <P>SOLUTION: The copper alloy material comprising, by mass, 1.0 to 5.0% Ni and 0.2 to 1.0% Si, and the balance Cu with inevitable impurities, and in which, regarding the distribution of Ni<SB>2</SB>Si precipitates with a grain size of 0.03 to 3 μm observed in the cross-section vertical to the rolling direction, the ratio between the number density ((a) piece/mm<SP>2</SP>) in the surface layer and the number density ((b) piece/mm<SP>2</SP>) in the internal layer is ≥2 is produced through: a forming stage for a copper alloy stock; a first heat treatment stage where the copper alloy stock is heated at 700 to 900°C, and is thereafter cooled to ≤300°C at a rate of ≥25°C/min; a rolling stage where rolling at a working ratio of ≤5% per pass is repeated, so as to be the total working ratio of ≥10%; a second heat treatment stage where heating is performed at 300 to 450°C for 5 min to 5 hr; and a third heat treatment stage where heating is performed at 450 to 600°C for 5 min to 5 hr. <P>COPYRIGHT: (C)2007,JPO&INPIT
【課題】高い機械的強度と良好な導電率を兼備し、かつ、優れた剪断加工性を併せ持つ銅合金材を提供する。 【解決手段】Niを1.0〜5.0質量%、Siを0.2〜1.0質量%含有し、残部がCuと不可避的不純物からなり、その圧延方向に垂直な断面にて観察される粒径0.03〜3μmのNi 2 Si析出物の分布に関して、表面層の数密度(a個/mm 2 )/内部層の数密度(b個/mm 2 )の比率が2以上である銅合金材を、銅合金素材の形成工程、700〜900℃に加熱後25℃/分以上の速度で300℃以下に冷却する第1の熱処理工程、1パス加工率5%以下の圧延を繰返し合計加工率10%以上とする圧延加工工程、300〜450℃で5分〜5時間加熱する第2の熱処理工程、及び450〜600℃で5分〜5時間加熱する第3の熱処理工程を経て製造する。 【選択図】図1

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