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我厂生产的直径在200毫米以上的轧辊及轴类零件时,大都要表面淬火。由于设备条件所限,只能进行火焰螺旋推进加热的表面淬火法,由于火焰对
I plant the diameter of more than 200 mm in the roll and shaft parts, most of the surface hardening. Due to the equipment conditions, only the flame spiral propelled heating surface quenching method, due to flame pairs