The implementation of the control system overhaul in the gas treatmentarea in CST is reported. The former analogic system with localswitches has been replaced by a Distributed Control System withelectronic interfaces. The results achieved are presented.

The studies developed at CST sinter plant in order to point out any factor that may have an effect on plume visibility are reported. Specific software and indexes have been developed. The approach included a retrospective analysis followed by further industrial tests at the sinter plant with different material input (fuels and raw materials). The results are discussed with reference to potential effects on the plume visibility. Further steps are considered to progress the stack plume project.

Key past pilot plant developments in steelmaking and continuous casting are reviewed. The enhanced facility at Teesside Technology Centre is outlined. This comprises an EAF which can tap up to 6.9 t, a combined LAF/tank degasser, vertical with bending caster and ingot casting facilities. The equipment and early commissioning during 2006 are described.

The influence of the flow phenomenon of the cooling nozzle affecting the rod temperature and the factors affecting the cooling efficiency were examined through experiments and numerical analysis. The optimal conditions featuring excellent cooling efficiency can be deduced in the future by analyzing the flow conditions and design conditions.

To answer the current demand for hot dip galvanized automotive products, ArcelorMittal decided to modify its Mardyck electrolytic galvanizing line. Compared to the construction of a new hot dip galvanized facility, this option affords the advantage of re-using the entry and exit sections of the existing electrolytic line, as well as the building. The annealing furnace, supplied by Stein Heurtey, with amaximum capacity of 85 t/hr, was commissioned at the end of 2005.

A 30% increased production rate and surface cleanness can be obtained by DFI oxyfuel combustion on a galvanizing line of TKS. A 3 m long DFI unit, with direct flame impingement on the strip, allows a 200 °C surface temperature increase and a production rate of 105 ton/hour.

The new grade has significantly improved corrosion resistance in chloride solutions compared with currently available super duplex stainless steels (e.g. UNS S32750) and the 6Mo austenitic stainless steels (e.g. UNS S31254). Some references in industrial heat exchanger applications are highlighted.

A substantial remaining fatigue life of a riser steel pipe has been verified before re-installing it in another loading buoy. The analysis involves S-N predictions, evaluation of inspection results, fracture mechanics modelling, and stochastic modelling of the fatigue process. Recent rules and regulations give useful guidelines for deterministic fatigue life verification for items used beyond the original target service life. Through a reliability analysis, the actual probabilityof failure during the life extension can be revealed and an efficient inspection strategy can be determined.