Estimation of the state of metal of blast-furnace jackets and hot-blast stove casings by a nondestructive testing method

The possibility of using the technique of magnetic testing of the stress-strain state of metallurgic structures is investigated. This technique is based on the correlation dependence between the physico-mechanical properties and the coercive force Hc. Examples of the practical use of the technique for estimating the state of blast-furnace jackets and hot-blast stove casings are given. Trends of variation of the state of metal during a long time period are established.