Coppernickel,goodmachinabilityandbadcrackresistance.Repairweldingofsandholeandgraycastironmachinedsurfacesubjecttonoload.镍铜，易加工，但抗裂性较差。不受力的灰铸铁加工面及砂眼补焊型号:Z508焊芯直径:2.5/3.2/4.0/5.0长度:350-400)