1. Introduction to S220GD+ZM ZM Steel Coil
Zinc-Aluminum-Magnesium (ZM / ZAM) coated steel coil is the next-generation hot-dip alloy coated steel material, widely replacing conventional GI galvanized steel and GL galvalume steel for harsh service environments.
S220GD+ZM is our core structural ZM grade fully compliant with EN 10346 European standard, specially designed for light structural forming, roll forming, stamping and outdoor long-term exposure projects. As a top China ZAM coil exporter, GNEE STEEL stocks and custom-produces S220GD+ZM zinc aluminum magnesium coils for global buyers from Southeast Asia, Middle East, Europe, Australia and Africa.
S: Structural steel base
220: Minimum yield strength ≥220MPa
GD: Hot-dip coated substrate
+ZM: Zinc-Aluminum-Magnesium ternary alloy coating (Zn-Al-Mg)
2. Core Technical Parameters of GNEE S220GD+ZM Steel Coil
2.1 Mechanical Properties (EN 10346 Standard)
| Item |
Standard Value of S220GD+ZM |
| Minimum Yield Strength (Re) |
≥220 MPa |
| Tensile Strength (Rm) |
300–430 MPa |
| Elongation A80 |
≥20% |
| Forming Performance |
Excellent bending, roll forming & shallow drawing |
| Weldability |
Stable spot welding, arc welding performance |
2.2 Dimensional Range
Thickness: 0.3mm – 4.0mm
Width: 580mm, 1000mm, 1200mm, 1250mm, 1500mm (slit narrow strips acceptable)
Coil weight: 3–12 tons per coil (custom small coils available)
Edge: Mill slit edge / smooth cut edge
Tolerance: Thickness ±0.02mm, width ±2mm
2.3 ZM Coating Options
Coating weight: ZM90, ZM120, ZM180, ZM275 (g/m² double side)
Coating composition: Main Zn + 1.5–11% Al + 1.5–3% Mg + trace silicon, forming dense self-repair protective film
2.4 Surface & Processing
Surface finish: Zero spangle / fine uniform spangle, anti-fingerprint passivation optional
Standards compliance: EN 10346, ISO 9001, RoHS, factory third-party test reports available
Packaging: Seaworthy waterproof paper + metal hoop fixed export package for long sea transportation
3. Unique Advantages of S220GD+ZM Zinc-Aluminum-Magnesium Coil
Compared with traditional GI galvanized steel and Aluzinc GL coil, S220GD+ZM ZM steel owns irreplaceable strengths for global engineering buyers:
3.1 10–20 Times Higher Corrosion Resistance Than GI Steel
The ternary Zn-Al-Mg alloy forms stable hydrozincite protective film on steel surface. It resists salt fog, coastal salt mist, ammonia from livestock farms, acid rain and industrial corrosive air perfectly. Service life reaches 25–30 years under outdoor exposure.
3.2 Self-Healing Cut-Edge Protection (Core ZM Feature)
When coils are cut, punched or drilled, magnesium element in coating migrates to exposed raw steel edges, automatically forming anti-rust film to prevent edge rusting. No secondary edge anti-corrosion treatment needed, greatly lowering your post-processing cost.
3.3 Balanced Strength & Superior Formability
S220 base delivers moderate yield strength + high elongation. It supports complex roll forming for purlins, solar brackets, greenhouse frames without coating cracking or peeling during bending.
3.4 Scratch & Abrasion Resistant Coating
ZM alloy coating hardness is higher than pure zinc layer. Less damage during transportation, cutting and installation, reducing rejection rate for your finished products.
3.5 Cost-Effective Long-Term Solution
Thinner ZM coating weight achieves better anti-rust performance than thick GI zinc layer. It reduces material weight per project, cuts maintenance and replacement frequency, and can partially replace high-cost stainless steel in non-severe corrosive scenarios.
3.6 Good Paint Adhesion & Secondary Processing Compatibility
Smooth uniform ZM surface supports direct spraying, pre-painting and powder coating without extra priming treatment.
4. Why Choose GNEE STEEL as Your S220GD+ZM ZM Coil Supplier?
As a professional coated steel exporter with over 10 years export experience, GNEE STEEL fully supports global steel importers, distributors and processing factories:
4.1 Complete ZM Grade Stock & Custom Production
In stock S220GD+ZM, also supply DX51D+ZM, DX52D+ZM, S250GD+ZM, S350GD+ZM high-strength ZAM coils. Short lead time for customized dimensions and coating weights.
4.2 Strict Quality Inspection System
Each batch S220GD+ZM coil goes through salt spray test, coating weight test, mechanical tensile test, surface inspection, full original factory test certificates provided for customs clearance.
4.3 Global Stable Export Logistics
Rich shipping experience to Southeast Asia, Middle East, EU, Oceania, Latin America. Safe seaworthy packaging to avoid rust & scratch during long voyage.
4.4 One-Stop Coated Steel Solution
Full product line: ZM zinc aluminum magnesium coil, GI galvanized steel, GL galvalume coil, PPGI prepainted steel, cold rolled coil. Support mixed loading in one container to save your logistics cost.
4.5 Professional Foreign Trade Technical Support
Our engineer team can provide technical parameter comparison, material selection suggestion, sample supply before bulk order. Contact us for free S220GD+ZM samples to test your local environment adaptability.
.png)
