Key Details of Slitting's Impact on SPA-H Properties
No change to core mechanical properties
Slitting is a cold mechanical processing method (no heating/thermal treatment) that only severs the steel's physical structure, not the internal crystal structure or the Cu/Cr/Ni alloy elements that determine SPA-H's weather resistance and strength. Yield strength, tensile strength, elongation, and low-temperature toughness remain fully compliant with SPA-H standard requirements after slitting.
Negligible localized edge effects
Slitting may cause minor cold work hardening or tiny burrs at the cut edges (narrow affected zone: ≤1mm from the edge) due to shearing stress. This slight hardening does not spread to the main body of the strip/coil and has no impact on forming, welding, or patina formation of the material. Standard edge deburring (optional slitting service) can eliminate this minor effect entirely.
No damage to weather resistance/patina formation
The slitting process does not scratch or contaminate the main surface of SPA-H steel (protective film/paper is used during processing), and the cut edges only account for a tiny area of the material. The alloy oxide formation (patina) of the main surface is completely unaffected, and edge corrosion can be prevented by simple deburring or anti-rust treatment if needed.
Practical Note
