The paper explains in detail the driving and cooling principles of the converter trunnion ring, provides preliminary analysis from the perspectives of crack formation mechanism, material, machining and on-site operation according to the actual conditions of trunnion ring crack, and finds out the existing problems.

Through optimizing the fit dimension of upper and bottom torsionproof base with trunnion ring, and improving the fixing method of the upper and bottom torsionproof base, we radically eliminated the axial float and prevented the loose of the liner of the torsionproof base and alleviated the impact and the vibration.

By using 3D non-linear FEM for the calculation of mechanical stress of 70 t converter loop in different angles,the results indicate that both the overall mechanical stress and displacement are lower and are the symmetrical distribution obviously.

Converter loop is a heavy dimensional structure with complicated welded parts.

The converter loop is a key component to the converter,which is endured complicated mechanical and thermal stress at work.

Fitting up and welding technology of steelmaking converter trunnion ring;

Analysis on finite element of temperature field and revamp on ribbed slab of ring carriage of converter;

The basic structure and features of ring carriage of converter are analyzed.