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Large-diameter thick-walled seamless steel tubes are made by punching a steel ingot or a solid tube and then hot-rolled. Large-caliber thick-walled seamless steel pipe has an important position in China's steel pipe industry. According to incomplete statistics, there are about 240 seamless pipe production enterprises in China and about 250 sets of large-caliber thick-walled seamless steel pipe units. Large-diameter thick-walled seamless steel pipes are mainly based on the external diameter of their steel pipes. The general diameter of 325 mm or more we are called large-diameter steel pipe, thick-walled, general wall thickness of 20 mm or more on it.