Galvalume steel coil (often abbreviated as GL coil) is a high-performance coated steel product with a 55% aluminum, 43.4% zinc, and 1.6% silicon alloy coating applied to a cold/hot-rolled steel substrate via continuous hot-dip process. It outperforms standard hot-dip galvanized (GI) coil in corrosion resistance, heat resistance, and reflectivity (≈0.75 solar reflectance), making it a premium alternative for outdoor and high-temperature applications.
Core Grades & Standards (Global Common Specs)
Galvalume grades align with base steel forming properties (matching GI/EG grade systems), with unified international and regional standards for coating and substrate:
Key Technical Parameters
Coating Composition (fixed for standard Galvalume):55% Al (aluminum) + 43.4% Zn (zinc) + 1.6% Si (silicon) (by mass); the silicon eliminates brittle Al-Fe intermetallic layers and improves coating adhesion to the steel substrate.
Coating Weight: Common specs AZ50~AZ200 (50~200 g/m², total both sides); AZ150 is the most universal for outdoor use.
Substrate Compatibility: Cold-rolled (CR) substrate for thin gauges (0.12~1.5 mm) / hot-rolled (HR) substrate for thick gauges (1.5~6.0 mm); low-carbon steel (C≤0.12%) is standard (matching Fe-33/Fe-33-2/St3ps in your GOST pipe document).
Surface Treatments: Passivation (chromate/non-chromate), oiled, anti-fingerprint, embossed; non-chromate passivation is mainstream for environmental compliance.
Core Performance Advantages (vs. Galvanized GI Coil)
3~6x better corrosion resistance: The aluminum forms a dense, self-healing AlO oxide layer; the zinc provides sacrificial anode protection-ideal for coastal, industrial, and high-humidity environments.
Superior heat resistance: Withstands continuous temperatures up to 315°C (GI coil max ≈200°C); no coating peeling or discoloration under high heat.
High solar reflectivity: Reduces heat absorption (cool roof effect), cutting air conditioning energy consumption by 10~30%.
Good formability & weldability: Can be bent, stamped, and spot-welded; post-processing touch-up with Galvalume paint maintains corrosion protection.
Typical Applications (Matching Your Pipe/System Project Scenarios)
Combined with your attached GOST-based water supply/fire protection/HVAC system specs, Galvalume coil is the optimal material for:
Roofing/cladding: Corrugated sheets, standing seam panels for industrial/ commercial buildings (matching your ventilation/air duct systems).
HVAC & air ducts: Galvalume air ducts (better corrosion resistance than GI for outdoor/kitchen exhaust ducts).
Infrastructure: Photovoltaic (PV) bracket supports, transmission tower parts, water supply/fire protection system outer casings.
Agricultural/industrial: Silo panels, industrial workshop wall panels, outdoor equipment housings.
Building accessories: Light steel keels, rainwater gutters, downspouts (compatible with your DN series pipe systems).
GOST Compliance for Russian/CIS Projects (Aligned with Your Fe-33/Fe-33-2 Specs)
For projects following GOST standards (matching your attached Fe-33/Fe-33-2/St3ps galvanized pipe specs), Galvalume coil uses GOST-compliant base steel:
Base steel grades: St37-2 (Fe-33), St44-2 (Fe-33-2), 08kp (low-carbon, matching the weldability/forming requirements of your water supply/fire protection pipes).
Coating standard: GOST 14918-2020 (same as the galvanized steel sheet standard for your air ducts in the document).
Compatibility: Matches the thread/weld/flange connection requirements of your DN series pipe systems for integrated project material selection.
Key Purchase Notes
Match the base steel grade to forming needs: DX51D/SGCC/St37-2 for basic bending; DX53D/SGC440 for deep drawing.
Select coating weight by environment: AZ100 for indoor; AZ150 for general outdoor; AZ200 for coastal/industrial heavy corrosion.
Confirm surface treatment: Oiled for forming/transport protection; non-oiled/anti-fingerprint for direct painting/assembly.
Galvalume Steel Coil - Full Grade & Specification List
1. Standards
ASTM A792
EN 10346
JIS G 3321
GB/T 12754
2. Grades & Applications
| Type |
EN |
JIS |
ASTM A792 |
Typical Applications |
| Commercial Grade |
DX51D+AZ |
SGLCC |
CS Type B |
Roofing, wall sheets, general profiles |
| Forming Grade |
DX52D+AZ |
SGLCD |
FS Type B |
Simple stamping parts |
| Deep Drawing |
DX53D+AZ |
SGLCDD |
DDS |
Deep stamping, home appliance shells |
| Extra Deep Drawing |
DX54D+AZ / DX56D+AZ |
- |
DDQ |
Complex drawing components |
| High Strength |
S250GD+AZ |
SGLC340 |
Grade 33 |
Structural parts, frames |
| High Strength |
S350GD+AZ |
SGLC440 |
Grade 50 |
High strength structural use |
3. Coating
Coating composition: 55% Al - 43.4% Zn - 1.6% Si
Coating weight: AZ50, AZ70, AZ90, AZ100, AZ120, AZ150, AZ180
Unit: g/m² (double sided)
Coating Suggestion
Normal environment: AZ100 / AZ120
Coastal / industrial area: AZ150 / AZ180
4. Regular Dimensions
Thickness: 0.12 - 3.0 mm
Width: 600 - 1250 mm
ID: 508 mm / 610 mm
Surface: Regular spangle / Mini spangle
Surface treatment: Passivation + Anti-fingerprint
5. Most Popular Orders
DX51D+AZ / SGLCC / CS Type B + AZ100/AZ150For building roofing & wall panels
DX53D+AZ + AZ70/AZ100For home appliances, deep drawing parts
S250GD+AZ / S350GD+AZ + AZ150For structural and high-strength parts
For galvanized coils, the sheet steel is immersed in a molten zinc bath to make a sheet of zinc coated on its surface. It is mainly produced by continuous galvanizing process
, that is, the rolled steel plate is continuously immersed in a plating tank
with zinc melted
to make galvanized steel plate; alloyed galvanized steel plate. This kind of steel plate is also manufactured
by hot dip method, but immediately after being out of the tank
, it is heated to about 500 ºC to form an alloy coating of zinc and iron. This galvanized coil has good paint adhesion and weldability.
Audited Supplier 
){kind=link}