The core material characteristics of SUS630 laminated steel plate are “martensitic precipitation hardening + high strength + excellent corrosion resistance + good machinability,” combined with the inherent properties of the base material and the optimization of the lamination process, as detailed below:
1. Base material properties
It belongs to JIS standard martensitic precipitation-hardened stainless steel, with key alloy elements containing 15.5%-17.5% chromium, 3%-5% nickel, 3%-5% copper, and carbon content ≤0.07%.
After solution treatment and aging, a Cu-rich strengthening phase is formed, which is the core mechanism for achieving high strength.
The lamination process further optimizes the microstructure density, reduces internal defects, and improves performance stability.

2. Mechanical performance advantages
High strength and hardness: yield strength can reach 1000-1100 MPa, tensile strength 1100-1300 MPa, hardness HRC28-38, far exceeding ordinary stainless steel and low-carbon steel.
Balanced toughness: room temperature impact energy ≥40J, not prone to brittleness, capable of withstanding certain impact loads, suitable for structural load requirements.
Good dimensional stability: after lamination and heat treatment, internal stress is low and deformation is minimal, making it resistant to noticeable deformation from temperature changes or applied forces during long-term use.

3. Corrosion resistance
The matrix relies on chromium to form a dense passive film, resistant to atmospheric, freshwater, and neutral salt corrosion, superior to ordinary martensitic stainless steel.
The addition of copper enhances resistance to pitting and crevice corrosion, suitable for mildly acidic or alkaline and marine salt spray environments.
A smoother surface after lamination reduces sites for corrosive media to adhere, further improving corrosion reliability, but it is not suitable for strong oxidizing media such as concentrated nitric acid.

4. Machinability and service suitability
Good weldability: can be welded using conventional methods such as argon arc welding; post-weld aging restores weld strength.
Controllable cold working: although hardness is relatively high, bending, stamping, and cutting are feasible with corresponding adjustments to processing parameters (e.g., increased force, special tools).
Temperature tolerance: long-term use temperature should be ≤600°C; exceeding this can cause the strengthening phase to decompose, reducing strength.