Cu-CONTAINING LOW ALLOY STEEL EXCELLENT IN STRENGTH-LOW TEMPERATURE TOUGHNESS AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a Cu-containing low alloy steel excellent in balance of strength and low temperature toughness.SOLUTION: A Cu-containing low alloy steel has a chemical composition containing, by mass%, C:0.01-0.08%, Si:0.10-0.40%, Mn:0.80-1.80%, Ni:0.80-2.50%, Cr:0.50-1.00%, Cu:0.80...

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Hauptverfasser:	HONMA YUTA, SASAKI HAJIME, UNO KOKICHI, KAYANO RINZO, HASHI KUNIHIKO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	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
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a Cu-containing low alloy steel excellent in balance of strength and low temperature toughness.SOLUTION: A Cu-containing low alloy steel has a chemical composition containing, by mass%, C:0.01-0.08%, Si:0.10-0.40%, Mn:0.80-1.80%, Ni:0.80-2.50%, Cr:0.50-1.00%, Cu:0.80-1.50%, Mo:0.20-0.60%, Al:0.010-0.050%, Nb:0.030-0.080%, N:0.005-0.020% and further if desired, Ca:0.010% or less and the balance Fe with inevitable impurities, 0.2% bearing force of 525 MPa or more and a fracture appearance transition temperature (FATT) measured by 2 mmV notch Charpy impact test of -70°C or less.SELECTED DRAWING: Figure 1 【課題】強度と低温靱性のバランスに優れたＣｕ含有低合金鋼を提供する。【解決手段】Ｃｕ含有低合金鋼は、質量％で、Ｃ：０．０１〜０．０８％、Ｓｉ：０．１０〜０．４０％、Ｍｎ：０．８０〜１．８０％、Ｎｉ：０．８０〜２．５０％、Ｃｒ：０．５０〜１．００％、Ｃｕ：０．８０〜１．５０％、Ｍｏ：０．２０〜０．６０％、Ａｌ：０．０１０〜０．０５０％、Ｎｂ：０．０３０〜０．０８０％、Ｎ：０．００５〜０．０２０％を含有し、さらに、所望によりＣａ：０．０１０％以下を含有し、残部がＦｅ及び不可避不純物からなる化学組成を有し、０．２％耐力が５２５ＭＰａ以上で、かつ２ｍｍＶノッチシャルピー衝撃試験にて測定された延性脆性破面遷移温度（ＦＡＴＴ）が−７０℃以下を有する。【選択図】図１