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１．前言 复合钢管是以两种不同材质的材料紧密复合而成的一种管材。一般芯管为碳钢管，外管为不锈钢。铜、铝、塑料等包覆焊接而成。通常所说的复合钢管泛指不锈钢复合管。其通过改变碳钢管的壁厚以增加承载强度，保持外层超薄不锈钢带的厚度不变以实现节约，从而降低成本。故
1. Preface Composite steel pipe is a kind of pipe material which is made of two different materials. General core tube carbon steel pipe, stainless steel outer tube. Copper, aluminum, plastic and other coated welding. Commonly referred to the composite pipe refers to the stainless steel composite pipe. It reduces costs by changing the wall thickness of the carbon steel tube to increase the load-bearing strength, keeping the outer thickness of the ultra-thin stainless steel strip constant for economy. Therefore