DX51D Steel Grades
High-Performance Hot-Dip Galvanized Steel for Construction and Manufacturing
- Technical Support
DX51D Steel Technical Specifications & Applications
DX51D is a low-carbon, hot-dip galvanized steel grade compliant with EN 10346, offering excellent formability and corrosion resistance. With a tensile strength of 270–350 MPa and elongation ≥22%, it is ideal for applications requiring deep drawing and complex forming. Commonly used in construction, automotive, and appliance industries, DX51D provides reliable performance in environments with moderate exposure to moisture and corrosive elements. Manufactured under stringent quality controls, DX51D meets international standards, ensuring consistent quality and durability.
Table of Contents
1. Typical Uses & Selection Guidance
- Structural Applications DX51D is a low-carbon hot-dip galvanized steel grade compliant with EN 10346, combining excellent formability and corrosion resistance. It is widely used in construction, automotive, and appliance industries for roofing, wall cladding, and structural framing.
- Corrosion Protection The zinc coating on DX51D provides reliable corrosion resistance in environments with moderate moisture and exposure, extending the lifespan of gutters, panels, and general building components.
- Forming Advantages DX51D offers superior cold-forming properties, enabling efficient bending, cutting, stamping, and roll-forming. Its high ductility allows shaping into complex profiles without compromising structural integrity. Manufactured under strict quality controls, DX51D meets international standards, ensuring consistent performance in galvanized and structural steel applications. As a key product of Hengze Steel Group, DX51D is trusted worldwide for high-performance, durable galvanized structural steel solutions.
2. Technical Specifications Table
1. Chemical Composition Requirements (Maximum %)
| Steel Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Aluminum (Al) |
|---|---|---|---|---|---|---|
| DX51D | ≤ 0.18% | ≤ 1.20% | ≤ 0.12% | ≤ 0.045% | ≤ 0.50% | — |
2. Mechanical Property Requirements (Maximum Values)
| Steel Grade | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | Min. Elongation (%) Lo=80mm | Bend Angle (°) | Mandrel Diameter (× Thickness t) |
|---|---|---|---|---|---|
| DX51D | 140–300 | 270–500 | ≥ 22% | 180° | 6t |
3. Coating Adhesion (180° Bend Test) Requirements
| Coating Class | Mandrel Diameter (× Thickness t) |
|---|---|
| Z100, Z200 | 1t |
| Z275, Z350, Z450, AZ150, AZ200, AM100, AM125, AM150, AM175, AM200, AM225 | 2t |
| Z600 | 3t |
4. Applicable Hot-Dip Metallic Coating Types
| Coating Class | Composition (%) | Key Features |
|---|---|---|
| Z (Zinc) | ≥99% Zinc | Basic corrosion protection; suitable for general use. |
| ZA (Zinc-Aluminium) | 95% Zn, 5% Al | Improved corrosion resistance over pure zinc. |
| ZF (Zinc-Iron) | Zinc with iron alloy | Enhanced hardness and wear resistance. |
| ZM (Zinc-Magnesium) | Zn with 2–4% Mg, 5–13% Al | Superior corrosion resistance in harsh environments. |
| AZ (Aluminium-Zinc) | 55% Al, 43.5% Zn, 1.5% Si | Excellent corrosion resistance and heat reflectivity. |
| AM (Aluminium-Magnesium) | Al with Mg alloy | High corrosion resistance; suitable for high-temperature applications. |
3. DX51D vs DX52D — What’s the Difference?
| Property | DX51D Steel Grade | DX52D Steel Grade |
|---|---|---|
| Yield Strength | 140–300 MPa | 140–300 MPa |
| Tensile Strength | 270–500 MPa | 270–420 MPa |
| Elongation (80mm) | ≥22% | ≥26% |
| Bendability | 180° with 6t mandrel | 180° with 6t mandrel |
DX51D Steel FAQ：
DX51D is a European standard (EN 10346) designation for hot-dip galvanized low-carbon steel, primarily used for cold-forming applications. It offers excellent corrosion resistance due to its zinc coating and is commonly used in construction, automotive, and household appliance manufacturing.
DX51D steel has a minimum yield strength ranging from 270 to 500 MPa and a minimum elongation of 22%. These properties make it suitable for various forming processes, including bending and stamping.
DX51D is widely used in applications requiring good mechanical properties and corrosion resistance. Its low carbon content contributes to its excellent formability, making it ideal for roofing, wall cladding, structural components, and automotive parts.
DX51D steel can be coated with various metallic layers, including:
Z (Zinc): Pure zinc coating for basic corrosion protection.
ZA (Zinc-Aluminium): A zinc-aluminium alloy coating offering improved corrosion resistance.
ZF (Zinc-Iron): A zinc-iron alloy coating providing enhanced hardness and wear resistance.
ZM (Zinc-Magnesium): A zinc-magnesium alloy coating for superior corrosion resistance in harsh environments.
AZ (Aluminium-Zinc): An aluminium-zinc alloy coating offering excellent corrosion resistance and heat reflectivity.
AM (Aluminium-Magnesium): An aluminium-magnesium alloy coating suitable for high-temperature applications.
