1.What is surface modification treatment?
This is one of the most promising solutions currently available. By using a special water-based passivating solution or modified leveling solution in the final process of cold rolling (leveling or finishing), an extremely thin, transparent protective film is formed after treatment.
Latest Application Case: In August 2024, Shandong Iron & Steel Rizhao Co., Ltd. successfully applied Baosteel's new leveling solution modification technology, producing over 50 tons of cold-rolled products with a "degreasing-free, high-cleanliness surface." This technology achieves zero surface oiling while maintaining excellent corrosion resistance, filling the gap in oil-free supply for welding wire steel.
2.What is water-based passivation treatment?
As early as a 2015 industry conference, experts proposed achieving oil-free rust prevention through surface water-based passivation treatment. This method generates a dense passivation film on the steel plate surface to replace rust-preventive oil, which can meet rust prevention needs in short-term or specific environments.
3.How to change the rolling lubrication method?
A research project in Germany is exploring the direct use of "oil-free lubricants" (OFLs) during the rolling process to replace traditional oil-water emulsions. This method eliminates the introduction of oil at the source and can improve the surface cleanliness of the rolled strip.
4.How can we solve corrosion at its source?
This is a more upstream solution. Baosteel has also developed a technology for prefabricating a corrosion-resistant layer on raw billets, forming a metallurgical bond through hot and cold rolling, so that the final product itself has high corrosion resistance, thus eliminating the need for oiling and coating.
5.What are some summaries and suggestions?
For users: If your application requires extremely high surface cleanliness (such as welding wire, precision stamping parts) and you wish to eliminate the degreasing process, then oil-free, high-cleanliness products like those developed by Baosteel/Shandong Iron & Steel are an ideal choice.
It's important to consider that oil-free rust prevention technologies are typically developed for specific products (such as steel for flux-cored welding wire) or specific needs, and their rust prevention period and effectiveness may differ from traditional rust-preventive oils. When choosing a product, detailed technical discussions with the steel mill are necessary, taking into account your storage period, transportation environment, and subsequent processing requirements.