2500m3高炉炉身第9段冷却壁破损原因分析

根据2500m3高炉炉身第9段球墨铸铁冷却壁解剖结果和ABAQUS有限元分析软件热应力计算结果，分析了第9段冷却壁破损的原因。炉身第9段冷却壁破损严重主要是由冷却壁热应力引起的。冷却壁的抗拉强度、伸长率和组织形态不达标，造成冷却壁更易发生断裂。冷却水管内表面因铸造过程中的氧化和冷却水中溶解氧的腐蚀而产生的锈层，也阻碍了冷却系统的传热。

Failure Analysis of 9th Cooling Staves of 2500m3 Blast Furnace Shaft

The cause of the damage of the 9th ductile iron cooling staves of 2500m3 blast furnace shaft was analyzed by tensile test，metallographic analysis and the thermal stress simulation of the cooling staves by using the finite element method software ABAQUS．It was found that the thermal stress of the cooling staves caused by the temperature difference was mainly responsible for the damage．The less tensile strength，elongation and unqualified microstructure of the cooling staves make them more easily broken．The oxide layer on the inner surface of the cooling water pipe formed by oxidation during casting process and corrosion from the dissolved oxygen in the water also reduces the cooling ability of the cooling staves．