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生产Φ２５ｍｍ以下碳素钢管及不锈钢管的新方法是，对热轧管坯进行无张力连续减径，且只减外径而不改变管子壁厚，并确保管材的高精度。生产设备包括数台四辊式机架（该机架的轧辊相对前一台机架的轧辊呈４５°角布置），几个带槽卡环。工作机架的数量不超过８台；实际生产时
The new method of producing Φ25mm carbon steel pipe and stainless steel pipe is to continuously reduce the diameter of the hot rolled seamless pipe without tension and only reduce the outer diameter without changing the pipe wall thickness and ensure the high precision of the pipe. The production equipment consists of several four-roll stands with a 45 ° angle to the roll of the previous stand and several grooved snap rings. The number of working racks does not exceed 8; the actual production