中日合资常州天山复合钢有限公司引进日本90年代初的高新技术,建成我国第一条复合型不锈钢管生产线。该公司生产的天山牌复合型不锈钢管的质量、性能均达到纯不锈钢管的标准,硬度、延展性、价格等优于纯不锈钢管。该产品是以内壁碳素钢层包覆以不锈钢而成。碳素钢以高频焊接成形后,外层再覆以不锈 Sino-Japanese joint venture Changzhou Tianshan Composite Steel Co., Ltd. introduced Japan’s high technology in the early 1990s and built China’s first composite stainless steel pipe production line. The quality and performance of the Tianshan brand composite stainless steel pipes produced by the company all meet the standards of pure stainless steel pipes, and the hardness, ductility and price are superior to pure stainless steel pipes. The product is made of stainless steel coated with an inner wall carbon steel layer. After carbon steel is formed by high frequency welding, the outer layer is covered with stainless