| 摘要 |
A large generally cylindrical ingot mold is provided with four sections of tubing around its outer surface except for some distance from its top. A valve controlled water feed and a valve controlled steam feed are provided to each of the sections. The intermediate cooling sections have a greater cooling effect per square foot of mold surface than the top and bottom sections. After molten steel is poured into the mold, steam is fed into all four sections for several hours. Then at spaced time intervals steam is turned off and water turned on successively to the bottom section, the second section, the third section and finally to the top section. This condition exists for a time period longer than the period with steam on. Then at spaced time intervals water is turned off and steam turned on successively to the bottom section, the second section, the third section, and finally to the top section. The steam is turned off prior to stripping of the mold from the ingot.
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