Aging treatment is the core step that enables performance enhancement of SUS630 laminated steel plates. Its specific impacts focus on mechanical properties, corrosion resistance, and processing performance:
1. Mechanical properties: significant improvement in strength and hardness
During aging, Cu-rich precipitates form, hindering dislocation movement. Yield strength rises from ~400 MPa in the solution-treated state to 1000–1100 MPa, with tensile strength reaching 1100–1300 MPa.
Hardness increases from about HB200 in the solution-treated state to HRC28–38 (depending on aging temperature), greatly enhancing wear resistance.
Toughness varies inversely: higher aging temperatures (e.g., 550–580℃) slightly reduce strength but improve impact toughness (impact energy ≥40 J); lower temperatures (e.g., 480℃) yield higher strength but slightly lower toughness.

2. Corrosion resistance: stable with slight improvement
Aging does not disrupt chromium distribution in the matrix, maintaining a dense passivation layer. Resistance to atmospheric, freshwater, and neutral salt solutions remains comparable to the solution-treated state.
Slight improvement against pitting and crevice corrosion occurs because uniform precipitate distribution reduces weak zones, making it more suitable for marine or chemical environments.

3. Processing performance: slightly reduced but still acceptable
Post-aging hardness increases, making cold processing slightly harder; bending or stamping requires higher forces to avoid cracking.
Weldability remains generally stable; post-weld aging is required to restore strength in the weld zone without affecting overall performance.