Its fracture was compound cleavage and Intergranular fracture by LOM, SEM and heat treatment experimental instrument.There were massive free-ferrite and widmanstatten structure in big cleavage plane.

• 分析结果表明，其断裂属于解理和沿晶复合断裂，断口解理面较大，组织中有大块自由铁素体和粗大魏氏组织。