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Simulation and Process Optimization of Online Cooling for S460 Thick Plates
Guangyuan Wang1, Zhen Wang2, Feng Chai1
1Division of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China.
Materials (Basel, Switzerland)
|June 13, 2025
Summary
Optimizing thermo-mechanical controlled processing (TMCP) for thick S460 steel plates significantly improved internal toughness. Enhanced cooling strategies reduced microstructural degradation in deep sections, crucial for marine applications.
Area of Science:
- Materials Science
- Metallurgical Engineering
Background:
- Thick S460 steel plates are vital for marine structures like vessels and offshore platforms.
- Optimizing their manufacturing, particularly thermo-mechanical controlled processing (TMCP), is critical for performance.
Purpose of the Study:
- To investigate microstructural and property variations in 120 mm-thick S460 plates manufactured via TMCP.
- To develop and validate an optimized cooling scheme for enhanced plate properties.
Main Methods:
- Fabrication of 120 mm-thick S460 plates using TMCP.
- Development of a finite element model to simulate the cooling phase and predict internal cooling paths.
- Implementation and validation of an optimized cooling scheme.
Main Results:
- Initial cooling parameters resulted in poor toughness at 60 mm depth (59 J impact energy) due to ferritic bainite and pearlite.
- Numerical simulations confirmed a 1.10 °C/s cooling rate at 60 mm depth under initial conditions.
- The optimized process (725 °C, 160 s) increased the cooling rate to 1.36 °C/s at 60 mm depth, improving impact energy to 144 J and refining microstructure.
Conclusions:
- Enhanced internal temperature gradients and prolonged cooling durations effectively inhibit microstructural degradation in thick steel plates.
- The optimized TMCP cooling scheme provides theoretical and practical solutions for manufacturing superior extra-thick steel plates for marine engineering.
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