生产大口径厚壁无缝钢管的方法很多,其中以热轧法最为经济。根据我国国防工业的需要,去年我厂承担了D6AC、D6AE无缝钢管的生产任务。但是,这种钢管的规格要求大大超过我厂现有轧机设备的生产能力,因此我们决定用拉拔式热扩径机试扩这种产品,试扩时,改进热扩工艺,对扩径程序作特殊安排,试扩获得 There are many ways to produce large diameter thick-walled seamless steel tubes, among which the hot-rolling method is most economical. According to the needs of China’s defense industry, last year I assumed the factory D6AC, D6AE seamless steel pipe production tasks. However, the specification of this kind of steel pipe greatly exceeds the production capacity of the existing rolling mill equipment of our factory, so we decided to expand this kind of product by using the drawing type thermal expansion machine. When expanding, we will improve the thermal expansion process, Make special arrangements to expand