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  属于冷轧钢管设备及工艺类。其特征是在一条轧制线上串列式设置初轧机头(机架)和精轧机头(机架),由主动曲柄轴和被动曲柄轴经过连杆带动以相反的方向做往复运动,曲柄为两侧布置或中间布置实现轧制过程;在初轧机头和精轧机头均装有两排轧辊,每排轧辊由3个至5个轧辊构成,3个轧辊的轴线在垂直的平面内相互成120°角,两排轧辊之间轴线成60°轧辊为变断面或常断面大开口角形。
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