Continuous hardening of metal pipe - where ring nozzle in pipe bore provides spiral streams of quenching water,申请号IT19770019795-传众专利搜索

Continuous hardening of metal pipe - where ring nozzle in pipe bore provides spiral streams of quenching water

申请公布号：IT1077605(B)

申请号：IT19770019795

申请日期：1977.01.31

申请公布日期：1985.05.04

申请人：

NIPPON KOKAN KK

分类号：C21D;(IPC1-7):C21D/

主分类号：C21D

摘要：<p>The bore of a metal pipe is cooled during a continuous hardening process, where the pipe travels in its axial direction through a heater and then over a perforated ring nozzle located in a transverse plane (t) at 90 degrees to the pipe axis. The nozzle has a circular row of holes, each hole axis being set at an angle of 30-70 degrees forward of plane ( t) in the direction of pipe travel; and each hole axis is also set at an angle of 30-90 degrees w.r.t. the radial direction of the pipe. The coolant is fed at a velocity >5 m/s out of the large number of holes onto the bore of the pipe. The coolant is pref. water of a water-air mixt.; and the pref. equipment includes a ring nozzle forming the cpd. angle specified above. Water is fed to the nozzle by one pipef and air and water by either two pipes or a coaxial pair of pipes. Spiral streams of coolant are provided for uniform quenching of the pipe.</p>