To the steel used in furnace mantle of blast furnace and complement hot-blast furnace,against the request of bearing thermal fatigue and pressure under the condition of service, with the compiling of Chinese Standard Technical Specification for Smelting Processing Blast of Iron and Steel Enterprise, the thermal fatigue and strain-aging property of steel Q345-(B,C,GJC) and Q390-(GJC,D)are studied.

Test and analysis of N0.2 BF shell at Baogang;

Application of electroslag welding in welding of 5~# ,6~# blast furnace shell;

The structural stability of shell of blast furnace was studied,and the simple method of estimating the critical force by Walimier formula was propose,by which the critical load in the stalk direction was calculated for No.