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    • 59. 发明专利
    • PRODUCTION OF COMPOSITE HOLLOW METAL CAST INGOT
    • JPS5597860A
    • 1980-07-25
    • JP294379
    • 1979-01-17
    • JAPAN STEEL WORKS LTD
    • TANIGUCHI KOUZOU
    • B22D18/04B22D7/02B22D7/04B22D18/00B22D19/00B22D19/16B22D23/00
    • PURPOSE:To economically produce the high grade composite hollow metal cast ingot for production of clad pipe by using a metal mold which has a dummy bar at the top end and a skirt made of refractories at the bottom end and subsequently forming the shells of dissimilar metals on the inside surface thereof. CONSTITUTION:Dissimilar metals, e.g., carbon steel 11 and stainless stell 12 are respectively received in ladles 13, 14 and these are installed on the turntable 15 in a tank 10. Next, the ladle 13 is installed right under a water-cooled metal mold 1 and this is moved upward to dip its refractory skirt 6 into molten metal 11 to push up the molten carbon steel 11 into the metal mold 1 and enclose the dummy bar 2, thereby forming the solidified shell 30 of the specified thickness on the inside surface of the metal mold 1. After this, the unsolidified molten steel is allowed to return into the ladle 13 and the ladle 13 is lowered. Thence, the ladle 14 is moved to right under the metal mold 1 and the operations similar to the above are performed to let the stainless steel 12 secure on the inside surface of the above-mentioned solidified shell 30, thereby forming the solidified shell 31 and obtaining the composite hollow metal ingot.