DX51D+Z is a widely applied hot-dip galvanized steel grade, commonly used in construction, automotive components, and household appliances.
Here, "D" refers to cold-rolled steel, "X51" indicates its performance level, and "+Z" represents the galvanizing coating. Wanzhi Group supplies galvanized layers ranging from Z30 to Z350, with frequently used specifications like DX51D Z100, Z140, Z180, Z275.
Popular products include:
DX51D Z100 GI Steel Sheet
DX51D GI Steel Sheet
Galvalume Steel Sheet
DX51D+AZ Galvalume / Aluzinc Sheet
Chemical Composition of DX51D+Z
| Element | Typical Content (wt%) | Purpose |
|---|---|---|
| Carbon (C) | ≤0.12 | Enhances ductility and formability |
| Manganese (Mn) | ≤0.60 | Improves strength |
| Phosphorus (P) | ≤0.025 | Prevents brittleness at low temperatures |
| Sulfur (S) | ≤0.025 | Enhances machinability |
| Aluminum (Al) | ≥0.020 | Improves adhesion of zinc coating |
Mechanical and Performance Properties
| Property | Typical Range |
|---|---|
| Tensile Strength | 270~350 MPa |
| Yield Strength | 140~240 MPa |
| Elongation (A80) | ≥22% (suitable for deep drawing) |
| Zinc Coating Weight | Common grades: Z60, Z120, Z180, Z275 |
| Corrosion Resistance | Salt spray: 100~500h without red rust |
| Surface Finish | Regular zinc spangle, small/large spangle, or smooth surface for painting |
Materials and Dimensions
| Parameter | Specification |
|---|---|
| Standard | EN 10346 |
| Base Material | Cold-rolled low carbon steel |
| Coating | Pure zinc (GI) or zinc-iron alloy (GA), typically GI |
| Thickness | 0.15 ~ 6.0 mm |
| Zinc Layer | Z60, Z80, Z100, Z120, Z150, Z180, Z200, Z275 |
| Width | 600 ~ 1500 mm (customizable for slitting) |
Comparison with Similar Grades
DX51D+Z is a European EN 10346 standard material. Equivalent grades in other standards:
| Standard | Similar Material |
|---|---|
| EN 10346 | DX52D+Z, DX53D+Z, DX54D+Z |
| ASTM A653 | CS Type B (US, zinc in oz/ft²) |
| JIS G3302 | SGCC (Japan) |
| GB/T 2518 | DC51D+Z (China) |
DX51D+Z vs DX52D+Z / DX53D+Z / DX54D+Z
| Grade | Forming Level | Typical Applications |
|---|---|---|
| DX51D+Z | Basic | Simple bending, roofs, ventilation ducts |
| DX52D+Z | Medium | Moderate stamping, appliance panels |
| DX53D+Z | Deep Drawing | Automotive fuel tanks, washing machine drums |
| DX54D+Z | Extra Deep Drawing | Precision containers, complex structural parts |
Chemical Comparison (wt%)
| Element | DX51D+Z | DX52D+Z | DX53D+Z | DX54D+Z |
|---|---|---|---|---|
| C | ≤0.12 | ≤0.10 | ≤0.08 | ≤0.06 |
| Mn | ≤0.60 | ≤0.50 | ≤0.45 | ≤0.40 |
| P | ≤0.025 | ≤0.025 | ≤0.020 | ≤0.020 |
| S | ≤0.025 | ≤0.025 | ≤0.020 | ≤0.020 |
| Al | ≥0.020 | ≥0.020 | ≥0.020 | ≥0.020 |
Mechanical Properties
| Parameter | DX51D+Z | DX52D+Z | DX53D+Z | DX54D+Z |
|---|---|---|---|---|
| Tensile Strength (MPa) | 270~350 | 270~340 | 270~330 | 260~320 |
| Yield Strength (MPa) | 140~240 | 140~220 | 120~200 | 120~180 |
| Elongation (A80, %) | ≥22 | ≥24 | ≥26 | ≥28 |
| Hardness (HRB) | 50~70 | 48~65 | 45~60 | 40~55 |
DX51D+Z vs SGCC+Z / SGCD+Z
Chemical Comparison (wt%)
| Element | DX51D+Z | SGCC+Z | SGCD+Z |
|---|---|---|---|
| C | ≤0.12 | ≤0.12 | ≤0.08 |
| Mn | ≤0.60 | ≤0.50 | ≤0.45 |
| P | ≤0.025 | ≤0.035 | ≤0.025 |
| S | ≤0.025 | ≤0.035 | ≤0.025 |
| Al | ≥0.020 | ≥0.020 | ≥0.020 |
Mechanical Comparison
| Parameter | DX51D+Z | SGCC+Z | SGCD+Z |
|---|---|---|---|
| Tensile Strength (MPa) | 270~350 | 270~410 | 270~380 |
| Yield Strength (MPa) | 140~240 | 140~240 | 120~220 |
| Elongation (A80, %) | ≥22 | ≥18 | ≥26 |
| Hardness (HRB) | 50~70 | 50~75 | 45~65 |
Applications
DX51D+Z: Roofing, walls, appliance enclosures, ventilation ducts
SGCC+Z: Light structural parts, furniture, temporary barriers
SGCD+Z: Automotive fuel tanks, deep-drawn appliances
DX51D+Z Surface Treatments
| Treatment | Process | Use Case |
|---|---|---|
| Anti-fingerprint (AF) | Water-based acrylic coating 0.5~1.5μm | Appliance panels, electronics |
| Phosphating | Zinc phosphate coating 2~4 g/m² | Automotive parts for painting |
| Self-lubricating | Ultra-thin oil 0.5~2 g/m² | Precision stamping, reduces die wear |
| Oiling | Rust-proof oil 0.5~3 g/m² | Long-term shipping protection |
| Painting | PE/SMP/PVDF/HDP/PU 15~60μm | Roofing, panels, aesthetic protection |
DX51D+Z Further Processing
DX51D+Z can be processed into:
Corrugated sheets, roofing panels
Galvanized strips, perforated sheets, stamped sheets
Profiles, wire mesh, galvanized pipes
Processing methods include: stamping, forming, welding, cutting, and composite lamination. Its excellent workability makes DX51D+Z highly suitable for a variety of industrial and construction applications.
Q1: What does the designation "DX51D+Z" mean?
A: This is a standard European (EN) designation for a hot-dip galvanized steel grade:
DX: Indicates it is a forming steel primarily for cold forming applications.
51: A numerical designator specifying a base steel with a minimum yield strength typically ≤ 280 MPa and specific mechanical properties suitable for forming.
D: Denotes the ductility level. "D" stands for "Drawing" quality, indicating good to very good ductility for deep drawing applications.
+Z: Specifies the coating: hot-dip galvanized with a zinc coating.
Q2: What are its primary mechanical properties?
A: According to EN 10346, the typical properties are:
Yield Strength (Re): Usually 140 - 300 MPa (Note: No specific minimum is mandated; it's based on the base steel chemistry for formability).
Tensile Strength (Rm): 270 - 500 MPa.
Elongation (A₈₀): Typically ≥ 22% - 26% (minimum depends on thickness). This high elongation is key for its formability.
It is not a high-strength steel. Its value lies in its excellent formability and corrosion protection.
Q3: What is the "Z" coating, and what are typical coating weights?
A: The "Z" stands for a massive zinc coating applied via the continuous hot-dip galvanizing process. The coating weight is specified by a suffix (e.g., Z140, Z275):
Example - DX51D+Z140: Minimum total coating mass of 140 g/m² (approx. 20 µm per side, 40 µm total). Common codes are Z100 (light), Z140 (standard), Z200/Z225 (heavy), and Z275 (extra heavy for severe environments).
Q4: What are the main applications for DX51D+Z?
A: It is the workhorse steel for general fabrication where corrosion resistance and formability are needed, but not high structural strength. Common uses include:
HVAC ductwork and components.
Appliance housings (washing machines, dryers, enclosures).
Light gauge building panels and profiles.
General metal cabinets, enclosures, and light furniture.
Agricultural and industrial containers.