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A Magnet Cannot Identify the Exact Stainless Steel Grade
Magnetic attraction is not a complete stainless-steel identification test. Use material documentation or an appropriate qualified assessment when the exact grade matters to a coating project.
Updated · NANOLAB Knowledge
The key distinction
Worldstainless describes stainless families with different magnetic behaviour. A simple magnet observation therefore cannot establish a precise grade, finish or corrosion suitability for the intended environment.
Practical checks
- Request the component's material and finish records.
- Record uncertainty rather than assigning a grade from appearance or magnet response.
- Confirm the coating's approval for the actual exposed surface.
Example
Illustrative example: a panel attracts a magnet, and a contractor concludes that it cannot be stainless steel. That conclusion ignores the range of stainless families and may misdirect the preparation discussion.
Scope and limits
Do not use this guide to select structural or corrosion-critical alloys. The material specialist should resolve grade identification; coating selection remains a separate assessment of the finish and intended use.
Related guidance
- Stainless Steel Grade and Coating: Separate Decisions
- Nano Coating for Stainless Steel: A Practical Guide
- Decorative Metal Samples: Include the Visible Edge in Appearance Approval
- Metal Finish Direction: Carry the Orientation Mark from Sample to Installation
Technical references: worldstainless: mechanical and physical properties. These sources describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.
Discuss the intended surface with NANOLAB. Use the current product documentation for formulation-specific instructions.