SPHEROIDAL GRAPHITE CAST IRON TUBE AND METHOD FOR PRODUCING THE SAME
PROBLEM TO BE SOLVED: To provide a spheroidal graphite cast iron tube which has high strength and high toughness. SOLUTION: The spheroidal graphite cast iron tube having high strength and high toughness has a composition containing, by weight, 3.20 to 4.00% C, 1.40 to 3.00% Si, 0.10 to 1.00% Mn, 0.0...
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| creator | NAKAMITSU TSUYOSHI NAKAMOTO KOJI SAITO MASAHIKO |
| description | PROBLEM TO BE SOLVED: To provide a spheroidal graphite cast iron tube which has high strength and high toughness. SOLUTION: The spheroidal graphite cast iron tube having high strength and high toughness has a composition containing, by weight, 3.20 to 4.00% C, 1.40 to 3.00% Si, 0.10 to 1.00% Mn, 0.02 to 0.08% Mg and 0.01 to 0.20% Cr, and further containing at least one kind selected from Sn and Cu in the range satisfying 0.050≤Sn (wt.%)+Cu (wt.%)/10≤0.089, and the balance Fe with inevitable impurities, and the spheroidal graphite cast iron tube has constitution in which the area ratio of pearlite with coarse interlayer spacing in the matrix structure is 50 to 90%, the number of grains of graphite crystallized out in the matrix structure is controlled to ≥300 pieces/mm2and the average grain diameter thereof is controlled to ≤15 μm, consequently the high strength and high toughness spheroidal graphite cast iron tube having tensile strength equal to that of FCD600 and elongation equal to or above that of FCD450 is obtained. COPYRIGHT: (C)2011,JPO&INPIT |
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SOLUTION: The spheroidal graphite cast iron tube having high strength and high toughness has a composition containing, by weight, 3.20 to 4.00% C, 1.40 to 3.00% Si, 0.10 to 1.00% Mn, 0.02 to 0.08% Mg and 0.01 to 0.20% Cr, and further containing at least one kind selected from Sn and Cu in the range satisfying 0.050≤Sn (wt.%)+Cu (wt.%)/10≤0.089, and the balance Fe with inevitable impurities, and the spheroidal graphite cast iron tube has constitution in which the area ratio of pearlite with coarse interlayer spacing in the matrix structure is 50 to 90%, the number of grains of graphite crystallized out in the matrix structure is controlled to ≥300 pieces/mm2and the average grain diameter thereof is controlled to ≤15 μm, consequently the high strength and high toughness spheroidal graphite cast iron tube having tensile strength equal to that of FCD600 and elongation equal to or above that of FCD450 is obtained. 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SOLUTION: The spheroidal graphite cast iron tube having high strength and high toughness has a composition containing, by weight, 3.20 to 4.00% C, 1.40 to 3.00% Si, 0.10 to 1.00% Mn, 0.02 to 0.08% Mg and 0.01 to 0.20% Cr, and further containing at least one kind selected from Sn and Cu in the range satisfying 0.050≤Sn (wt.%)+Cu (wt.%)/10≤0.089, and the balance Fe with inevitable impurities, and the spheroidal graphite cast iron tube has constitution in which the area ratio of pearlite with coarse interlayer spacing in the matrix structure is 50 to 90%, the number of grains of graphite crystallized out in the matrix structure is controlled to ≥300 pieces/mm2and the average grain diameter thereof is controlled to ≤15 μm, consequently the high strength and high toughness spheroidal graphite cast iron tube having tensile strength equal to that of FCD600 and elongation equal to or above that of FCD450 is obtained. 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| subjects | ALLOYS CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES 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 PERFORMING OPERATIONS POWDER METALLURGY PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL TRANSPORTING TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FERROUS METALS |
| title | SPHEROIDAL GRAPHITE CAST IRON TUBE AND METHOD FOR PRODUCING THE SAME |
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