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目前,在日本,发展钢管在线直接淬火(主要用于石油管)已成为钢管生产工艺改革的一种重要趋势。川崎制铁1978年开始研究,1981年1月在知多厂中径无缝管车间(16″自动轧管机)正式投入使用,目前已成功地生产了 C—75、N—80、P—110等高级油井管。新日铁在东京制铁所试验设备的基础上,在八幡厂16″自动轧管车间设置了一套直接淬火设备,几乎所有调质型油井管均在这一设备上进行淬火。住友金属公司也在尼崎厂设置有直接淬火设备。日本钢管公司也在1983年5月9日投产的扇岛厂连轧管机组(φ114.3～244.5mm)作业线上设计了直接淬火设备。
At present, in Japan, the direct on-line development of steel pipe quenching (mainly for the oil pipe) has become an important trend of steel pipe production process reform. Kawasaki Iron & Steel started its research in 1978 and was officially put into operation in January 1981 at the Jiduo Plant Medium Diameter Seamless Tube Plant (16 “automatic pipe rolling mill). At present, it has successfully produced C-75, N-80 and P-110 Etc. On the basis of the equipment tested by Tokyo Steel Works, Nippon Steel set up a set of direct quenching equipment at the 16 ”automatic pipe rolling plant in Yawata Plant. Almost all of the quenched and tempered oil well pipes are carried out on this equipment Quenching. Sumitomo Metal has also set up a direct quenching plant in Amagasaki. Nippon Steel Pipe Co., Ltd. also designed a direct quenching equipment on the operation line of the Fan Island Mill Continuous Tube Mill (φ114.3 ~ 244.5mm) put into operation on May 9,