| 摘要 |
PURPOSE:To cool a metallic pipe material having large hardenability quickly and efficiently without generating quench cracks in the stage of cooling said pipe material by cooling first the metallic pipe with mists then cooling the pipe with gaseous jets. CONSTITUTION:The pipe material A of a high temp. produced by the metal such as high C-Cr-Mo steel having the large hardenability is cooled while the material is conveyed by rollers 18. The pipe material is first conveyed to a mist cooler 11 where the material is cooled by the liquid drop-like small mists sprayed from mist nozzles 14 by air headers 12 and water headers 13 toward the periphery of the pipe A down to about 350 deg.C. The pipe is then fed into a gaseous jet cooler 15, where the pipe is cooled by the gaseous jets blown from slit nozzles 16 connected to air headers 17. The metallic pipe having the large hardenability is thus cooled by such two-stage cooling without generating quench cracks.
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