日本钢管公司开发出两种生产复合钢管的新方法:曼内斯曼轧制法和扩散结合法。曼内斯曼轧制法,将高强度碳素钢外管和镍、铬含量高的耐蚀合金内管套在一起,然后在自动轧管机上,一边加压一边扩大内管。此法与热挤压法类似,但由于施加离心力,可使内径更大,适合于生产φ150～400mm 中径复合管。该法适用于钢和高镍合金等硬金属的复合。扩散结合法,软金属用强压力结合很困 Nippon Steel Pipe Company has developed two new methods of producing composite steel pipe: Mannesmann rolling method and diffusion bonding method. Mannesmann rolling method, the high-strength carbon steel outer tube and nickel, chromium content of the corrosion-resistant alloy sleeve together, and then in the automatic pipe rolling machine, while expanding while expanding the inner tube. This method is similar to the hot extrusion method, but due to the application of centrifugal force, the inner diameter can be larger, suitable for the production of φ150 ~ 400mm diameter composite pipe. The law applies to steel and high-nickel alloy and other hard metal composite. Diffusion combined method, soft metal combination with strong pressure is very sleepy