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一、前言用于周期轧机的皮尔格轧辊(材质ZG80CrMo)和用于650轧机的650轧辊(材质ZG70Mn2Mo)都属于大型合金铸钢轧辊,近年来经常出现横向断辊现象,1978年皮尔格轧辊机加工粗车后发生断辊6支,1983年650轧辊在使用中发生连续断辊三支,1984年又在出厂前发生断辊一支,断裂多发生在冒口端(图1)。断辊全部为横向断裂,断口整齐心部粗糙,呈现粗晶形貌。裂痕从心部向外呈放射
I. Introduction Pilger rolling mill (material ZG80CrMo) for cycle rolling mill and 650 rolling mill (material ZG70Mn2Mo) for rolling mill 650 belong to large-size alloy cast steel roll. In recent years, horizontal break roll phenomenon often occurs. In 1978 Pilger roll mill 6 pieces of broken roller were processed after the roughing. In 1983, there were three consecutive broken rollers in use of the 650 roller. In 1984, one broken roller occurred again before delivery, and the fracture occurred in the riser end (Fig. 1). Broken roller for all transverse fracture, broken heart neat rough, showing coarse crystalline morphology. Rift radiates outward from the heart