SHANGHAI RUICHAO INDUSTRIAL
SHANGHAI RUICHAO INDUSTRIAL
ZAM steel is a type of zinc-coated carbon steel enhanced with magnesium for superior protection. This advanced coating offers stronger resistance to rust, scratches, and wear than standard galvanized steel. Commonly used in automotive parts, appliances, roofing, and building exteriors, ZM steel provides exceptional durability and paint adhesion—making it ideal for demanding or corrosive environments.
Specification Parameters
| Parameters of ZAM Steel (Zn-Al-Mg Coated Steel) | |||
| Parameter Category | Specific Parameter | Typical Value / Description | Importance / Effect |
| Coating Composition | Zinc (Zn) | ~90% - 96% | Forms the primary sacrificial protection layer, as in traditional galvanizing. |
| Aluminum (Al) | ~4% - 11% | Forms a dense, protective barrier layer of Al₂O₃, dramatically slowing the corrosion rate. Reduces coating consumption. | |
| Magnesium (Mg) | ~1% - 3% | Enhances the sacrificial protection mechanism, promotes the formation of stable, protective corrosion products that "seal" scratches. | |
| Coating Properties | Coating Mass/Weight | 60 to 275 g/m² (total both sides) Common: ZAM 120 (120 g/m²) | The total amount of Zn-Al-Mg coating applied. Directly related to expected service life. |
| Corrosion Resistance | Exceptional: 10x to 20x better than standard GI (Galvanized) steel of equivalent coating weight in severe environments (e.g., with chlorides). | The primary advantage. The synergy of Al (barrier) and Mg (enhanced sacrificial) provides ultra-durable protection, especially at cut edges. | |
| Cut Edge Protection | Superior. Corrosion products migrate to protect exposed steel edges, preventing the "undercutting" rust seen with GI. | Critical for longevity in pre-fabricated building panels and structures where cutting is required. | |
| Coating Hardness | Higher than standard GI coating. | Provides better abrasion and scratch resistance during handling, transport, and fabrication. | |
| Base Steel Properties | Steel Grade/Type | Structural (e.g., S550GD), Forming (e.g., DX54D+Z), Commercial Quality | Determines the mechanical properties (strength, formability) of the underlying substrate. |
| Yield Strength | 250 MPa - 700 MPa+ (depending on base steel grade) | Provides the structural integrity for the application. | |
| Performance & Fabrication | Weldability | Good (comparable to GI). Requires slightly adjusted parameters in resistance spot welding. | The coating can be welded, though electrode life may be affected differently than with standard GI. |
| Paint Adhesion | Excellent. Compatible with standard painting and pretreatment systems. | Can be used in painted applications for enhanced durability and aesthetics. | |
| Formability | Good. Can be bent and formed. The harder coating may show more micro-cracking than GI on tight bends, but this is sealed by its superior corrosion products. | Suitable for most forming operations required in construction and manufacturing. | |
