Situation: Achieving high surface quality of hot rolled high strength steel strip and reproducible rolling results remains challenging: Primary scale […]
HiJetRod Pilot – Resource-efficient hydromechanical descaling system for wire coils
- Descaling of stainless steel wire requires several pickling steps with high consumption of chemicals and long treatment time.
- Stainless steel grades that are difficult to descale have to be treated with up to 100 % of double passages of the wire coils through the pickling line.
- In the forerunner project HiJetRod a process for hydromechanical descaling of wire coils has been developed.
- Scale-free surface of wires after a single passage through the pickling line, including high-alloyed steel grades
- Avoiding double passages through the pickling line and increasing production capacity
- Reduction of water and energy consumption of hydromechanical descaling
- Demonstration of hydromechnical descaling in pilot tests
- Quantification of process benefits (reduction of treatment time and acid consumption)
Innovative process approaches
- Use of new pulsating nozzles for efficient descaling
- New concept for coil rotation to minimize contact marks due to wire-wire contact
- Pilot tests for determination of efficiency including life cycle assessment
Current results (as of 03/2018)
- First pilot tests have shown the efficiency of hydromechanical descaling for 13 stainless steel grades.
- In laboratory tests, pulsating nozzles have shown better descaling results than flat fan nozzles. However, for utilization in pilot installations their start-up behavior has to be improved.
- Contact marks due to wire-wire contact can be minimized with a modified turning mandrel.
- A representation of the descaling process has been set up with the program SIMBA# for development of a water recycling concept.
- Pilot tests for a wide range of stainless steel wire coils, determination of descaling efficiency, resource consumption and maintenance effort
- Life cycle assessment for process evaluation
Applications and transferability of the hydromechanical descaling process