1. Definition & Classification

DX51D (EN 10346 standard) and SGCC (JIS G 3302 standard) are designations for commercial-grade hot-dip galvanized steel sheets with a pure zinc coating. These sheets are widely used due to their excellent formability, corrosion resistance, and weldability.

DX51D – European standard (EN 10346), primarily used in construction, appliances, and general manufacturing.

SGCC – Japanese standard (JIS G 3302), commonly used in automotive, roofing, and industrial applications.

2. Zinc Alloy Types in DX51D Galvanized plate

DX51D galvanized sheets can be coated with different zinc alloys, categorized into:

A. Cast Zinc Alloys

Common Alloy: Zinc-Aluminum-Copper-Magnesium (Zn-Al-Cu-Mg)

Properties:

Excellent casting performance.

Cooling rate has minimal impact on mechanical properties.

Applications:

Mechanical parts, toys, decorative items, home appliances.

B. Deformed Zinc Alloys

Zinc-Aluminum Alloy (Zn-Al, 4-15% Al)

Enhanced Properties:

Higher strength & hardness (with added Cu, Mg).

Can replace brass or duralumin in precision forgings.

Applications:

Automotive components, structural parts.

Zinc-Copper Alloy (Zn-Cu, 0.7-1.5% Cu)

Enhanced Properties:

Improved strength & impact toughness.

Slightly reduced plasticity.

Applications:

High-stress mechanical parts, fasteners.

3. Key Characteristics of DX51D/SGCC Galvanized plate

 Corrosion Resistance – Zinc coating protects against rust.

 Formability – Suitable for deep drawing, bending, and stamping.

 Weldability – Compatible with spot welding and arc welding.

 Surface Finish – Smooth, spangle-free (or minimal spangle).

 Cost-Effective – Cheaper than stainless steel with good durability.

4. Applications Across Industries

Industry Uses

Construction Roofing, wall panels, steel structures

Automotive Body panels, chassis parts, brackets

Home Appliances Refrigerators, washing machines, AC units

Agriculture Grain silos, fencing, greenhouses

Energy & Transport Solar mounting, cable trays, highway guardrails

Electronics & Communications Electrical enclosures, server racks

5. Comparison: DX51D vs. SGCC

Parameter DX51D (EN 10346) SGCC (JIS G 3302)

Standard European Japanese

Coating Type Pure Zinc (Z) or Zn-Fe (ZF) Pure Zinc

Coating Weight (g/m²) Typically Z100-Z275 Typically SGCC 30-90

Main Use Construction, appliances Automotive, roofing

6. Conclusion

DX51D/SGCC galvanized sheets are versatile, durable, and economical, making them ideal for construction, automotive, and appliance manufacturing. The choice between cast or deformed zinc alloys depends on mechanical requirements, while DX51D (EU) and SGCC (Japan) serve similar purposes with slight regional variations.