To get a large axial movement, with low rigidities, these metallic expansion joints have been designed with multi-layer bellows made of high-strength refractory stainless steels, with leakage detection systems. In this case, an inner sleeve has not been required since there was a large lateral movement to be absorbed. On the side walls of strip steel production plants, fabric expansion joints are often used with very high movement capability, whilst giving full gas tightness and high temperature insulation from the process.

CGL / CAL Steering Roll Expansion Joints

Special moulded silicon coated, multi-layer expansion joints, designed to operate in excess of 500°C, to seal the steering roll to the continuous galvanising line, allowing high lateral movements. In order to protect the steel against corrosion, a thin zinc layer is applied via a hot dip galvanizing line = CGL CGL. The CAL line changes the crystal structure of the steel sheet by heat treatment and improves properties such as hardness, strength, and elongation.

Entry Seal Expansion Joints

Metallic and fabric joints as seals to the furnace and galvanising lines, which ensure air / gas tightness. Integrated nitrogen injection ports in the moulded joints and full movement flexibility for high cycles.