METHOD FOR MANUFACTURING EXTREMELY THICK STEEL PLATE FOR BOILER

PURPOSE:To obtain an extremely thick steel plate to be used for making boiler which is excellent in weldability and high in toughness, by performing water hardening and tempering at a specific temperatures on the steel plate containing alloy elements, such as C, etc., in a specific range. CONSTITUTI...

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Bibliographische Detailangaben
Hauptverfasser:	ISHIKAWA MASAAKI, UEDA SHIYUUZOU, KUSUHARA YUUJI, KOSHIZUKA NORIAKI
Format:	Patent
Sprache:	eng
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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Beschreibung
Zusammenfassung:	PURPOSE:To obtain an extremely thick steel plate to be used for making boiler which is excellent in weldability and high in toughness, by performing water hardening and tempering at a specific temperatures on the steel plate containing alloy elements, such as C, etc., in a specific range. CONSTITUTION:A steel plate having a thickness of approx. >=75mm. is manufactured from a steel composed of 0.11-0.13wt% C, 0.02-0.40% Si, 1.00-1.50% Mn, 0.10-30% Cu, 0.40-0.65% Ni, 0.49-0.65% Cr, 0.20-0.28% Mo, 0.04-0.07% V, 0.005-0.060% Al, and the rest of unavoidable impurities and Fe. This steel plate is water hardened from a temperature higher than the Ac3 point and then tempered at a temperature of >=660 deg.C. When this method is applied, an extremely thick steel plate to be used for making boiler which is low in the sensibility for welding crack and meets required mechanical characteristics are obtained.