Careers A stainless-steel mill in Germany operates continuous annealing furnaces that support demanding throughput and metallurgical quality requirements. Within one of its key annealing units, the refractory surfaces in three heating zones had begun to show reduced emissivity and early-stage deterioration. This decline risked lowering radiant efficiency, increasing fuel consumption, and introducing unnecessary thermal variability. These issues could ultimately impact production cost and process consistency. The plant’s objective was to restore radiant efficiency, protect refractory integrity, and enhance long-term thermal performance, all without interrupting the tight production schedule.
Restoring Radiant Efficiency in an Annealing Furnace Production Plant
Evaluating Available Options
The plant evaluated several approaches to restoring refractory performance, including partial refractory repair or full refractory replacement. Both options required longer interventions, higher materials cost, and greater disruption to furnace availability.
IGS was selected for its proven high-emissivity ceramic technology, rapid deployment capabilities, and ability to deliver a high-value efficiency uplift without invasive maintenance. The solution met the plant’s priorities of speed, reliability, and measurable operational improvement
Scope of Work Details
| Activity | Description |
|---|---|
| Surface Preparation | Ensured optimal bond by preparing all refractory surfaces. |
| Base Layer Application | Applied a Cetek coating to stabilize refractory surfaces. |
| Top Layer Application | Applied Cetek High Emissivity Refractory Coating to enhance emissivity and protect against further degradation. |
| Quality Assurance | Followed the project-specific ITP and QCP throughout the work. |
Solution Delivery Summary
| Category | Details |
|---|---|
| Work Scope Area | Application of a high emissivity Cetek system to ~200 m² / 2,153 ft² of refractory surfaces within Zones 1–3 of the annealing furnace. |
| Execution Team | Specialized application team deployed to site. |
| Duration | 3-day execution window |
| Safety & Compliance | Zero incidents; full adherence to project-specific Inspection Test Plan (ITP), Quality Control Plan (QCP), and all site requirements. |
Quantifiable Impact and Proven Results
The project was successfully completed on time, returning the furnace to operation with restored radiant efficiency and enhanced refractory protection.
| Outcome | Description |
|---|---|
| Improved Radiant Efficiency | The Cetek dual system increased the radiant efficiency of refractory surfaces, contributing to stable furnace performance. |
| Extended Refractory Life | Treatment mitigates further deterioration, extending functional refractory life. |
| Long-Term Coating Performance | The system is expected to last ~8 years before requiring inspection or reapplication. |
| Minimized Downtime | Rapid, non-invasive deployment avoided extended downtime associated with refractory repair or replacement. |
| Reduced Gas Consumption | Total gas savings reached 7–10% with the combined upgrades, with the Cetek treatment contributing a clear ~3–4%. |
| Support of Plant Objectives | Outcomes aligned directly with the plant’s goal of maintaining reliable furnace performance with minimal operational disruption. |
Enhanced emissivity,extended refractory life, and uninterruptedproduction – all delivered in a three-dayintervention
“Our focus was to give the client greater thermal efficiency and long-term confidence in a core production asset. By applying a proven high-emissivity solution quickly and safely, we helped them strengthen operational stability without disrupting their production commitments.”
– Woldemar Haak, Business Development Manager, IGS
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