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Products Description
S220GD+ZM galvanized aluminum magnesium steel coil is a high-performance structural grade hot-dip coated steel product, integrating medium strength, ultra-high corrosion resistance and self-healing properties. As a core product of GNEE STEEL, it is widely used in construction, photovoltaic, automotive and home appliance industries, with a service life 3–6 times longer than ordinary hot-dip galvanized steel coils (+Z), making it the preferred cost-effective long-life material for high-corrosion environments.
The grade of S220GD+ZM follows EN 10346 and Baosteel Q/BQB420 standards, and each part of the code has a clear meaning:
- S220GD: Base material grade, which stands for hot-dip galvanized cold-rolled base material for structural use.
- S: Abbreviation of "Structural", indicating structural steel.
- 220: The minimum yield strength is about 220 MPa, which belongs to medium-strength structural steel.
- GD: Abbreviation of "Hot-dip Galvanized", indicating that the base material is suitable for hot-dip coating processing.
- +ZM: Coating code, referring to zinc-aluminum-magnesium alloy coating (Zinc-Aluminum-Magnesium Coating).
Typical composition: Approximately 93% Zn, 5% Al, 2% Mg (slightly different among different manufacturers).
It is different from ordinary pure zinc coating (+Z), aluminum-zinc coating (+AZ) and zinc-iron alloy coating (+ZF), with more excellent corrosion resistance.
Grade: S220GD+ZM
S220GD+ZM steel quality: Structural quality for construction
S220GD+ZM steel coating finish:
N (Normal spangle), M (Minimized spangle), R (Regular Zinc-magnesium alloy coating)
S220GD+ZM steel Coil/strip/sheet surface quality:
A (As coated surface), B (Improved surface),C (Best quality surface)
S220GD+ZM steel Coil/strip/sheet surface treatment:
C (Chemical passivation),O (oiling), CO(Chemical passivation and oiling), S ( Seales), P(Phosphated), U(Untreated)
S220GD+ZM steel Coil/strip/sheet coating mass:
ZM060, ZM070, ZM080, ZM090, ZM100, ZM120, ZM130, ZM140, ZM150, (ZM160), (ZM175), (ZM200), (ZM250), (ZM300), (ZM310), (ZM350), (ZM430),
S220GD+ZM steel Coil/strip/sheet coating:
Zinc-magnesium alloy (ZM) : application of a zinc-magnesium coating by immersing the prepared strip in a molten bath of zinc-aluminium-magnesium.
EN10346 S220GD+ZM steel suitable size: Thickness 0.3mm-3.0mm
S220GD+ZM steel chemical composition % by mass max
| Grade |
Material No. |
C |
Si |
Mn |
P |
S |
|
S220GD+ZM |
1.0241+ZM |
0.20 |
0.60 |
1.70 |
0.10 |
0.045 |
S220GD+ZM steel Mechanical properties
| Grade |
Material No. |
Yield Strength MPa |
Tensile strength MPa min |
Elongation A80 min |
|
S220GD+ZM |
1.0241+ZM |
220 |
300 |
20 |
Advantages of S220GD+ZM Steel Coil
Ultra-high Corrosion Resistance: It can withstand 800–1200 hours of neutral salt spray test without red rust, which is 3–6 times that of ordinary hot-dip galvanized steel coils (+Z). The cut surface can be self-passivated, and the dissolved Al and Mg will form a dense protective film to prevent corrosion.
Medium Strength & Easy Formability: The yield strength ranges from 220–280 MPa, the tensile strength ranges from 330–420 MPa, and the elongation is ≥30%, which perfectly balances strength and bendability/stampability, suitable for various processing scenarios.
Self-healing Ability: At the scratched or cut parts of the coating, Al and Mg will be oxidized first, and a dense passivation film will be automatically formed to prevent the spread of rust and effectively extend the service life of the product.
Long Service Life & Low Maintenance: It can achieve more than 25 years of maintenance-free service outdoors, and is especially suitable for harsh environments such as coastal areas and deserts, which is the first choice for photovoltaic brackets and coastal buildings.
Main Applications
Photovoltaic Industry: Photovoltaic brackets, bases, tracking systems (suitable for high salt spray and sandstorm environments)
Construction Industry: Roof/wall cladding, downpipes, light steel keels, garage doors
Automotive Industry: Chassis parts, seat frames, anti-collision beams, battery pack casings
Home Appliance Industry: Washing machine inner drums, refrigerator back panels, air conditioner casings (with anti-fingerprint and high corrosion resistance)
Difference from Common Grades
S220GD+ZM: Structural grade, medium strength, zinc-aluminum-magnesium coating (highest corrosion resistance)
DX51D+Z: Ordinary deep drawing grade, pure zinc coating (economical type)
DX54D+AZ: Deep drawing grade, aluminum-zinc coating (balance of heat resistance and corrosion resistance)
HC340LA+ZM: High-strength low-alloy grade + zinc-aluminum-magnesium coating (higher strength, slightly reduced formability)
test
Packaging and Shipping
FAQ
1.What does S220GD+ZM stand for?
S220GD refers to medium strength structural grade steel with a minimum yield strength of 220MPa; +ZM stands for zinc-aluminum-magnesium alloy coating. It is a hot-dip coated steel coil designed for structural and outdoor corrosion-resistant applications.
2.What is the difference between S220GD+ZM and ordinary galvanized steel?
S220GD+ZM adopts zinc aluminum magnesium coating, featuring self-healing performance, stronger salt spray resistance and longer service life. Its corrosion resistance is 3–6 times higher than regular hot-dip galvanized steel, ideal for coastal, photovoltaic and harsh outdoor environments.
3.What specifications can you supply for S220GD+ZM steel coil?
We provide thickness 0.4–6.0mm, width 600–2000mm, coating weight ZM70–ZM275g/m². Zero spangle, anti-fingerprint, passivated and oiled surface treatments are all available with customized sizes.
4.Is S220GD+ZM suitable for bending and stamping processing?
Yes. S220GD+ZM has good ductility and formability, balanced strength and elongation. It can be easily bent, stamped and processed into photovoltaic brackets, building panels and various structural parts without coating peeling.
5.What are the main application fields of S220GD+ZM?
It is widely used in photovoltaic support systems, construction roof and wall cladding, light steel structures, automotive chassis parts, home appliance shells and outdoor facility components.
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