What is DX51D galvanized steel?
DX51D is a European standard (EN 10346) hot-dip galvanized low-carbon steel designed for cold-forming, bending, and profiling applications. It offers excellent corrosion resistance and flexibility, commonly used in construction, roofing, automotive parts, and household appliances. Equivalent to Japanese JIS G3302 SGCC or European 1.0917, it is recognized for high formability and durability.
What is DX53D galvanized steel?
DX53D is a high-performance, cold-forming, hot-dip galvanized steel (EN 10346 standard) designed for deep drawing, offering excellent weldability, ductility, and high corrosion resistance. It is commonly used in automotive parts, household appliances, and complex structural components. It is equivalent to EN FeP05G or material number 1.0951.
galvanized steel
DX51D equivalent grade
DX51D is a European standard (EN 10346) hot-dip galvanized steel grade designed for general bending and profiling. Its closest international equivalents are SGCC (Japan/JIS G3302), ASTM A653 CS Type B/Grade C (USA), and Q195/Q235 (China). It is widely used for applications requiring moderate forming and corrosion resistance, such as building components.
- Key Equivalent Grades by Standard
Japan (JIS): SGCC
USA (ASTM): ASTM A653 CS Type B, A653 Grade C
China (GB): Q195, Q235, DX51D (GB/T 2518)
Germany (DIN): St02Z, St12, 1.0322, 1.0335
ISO: SPCC
Chemical Composition Difference Between DX51D and DX53D
The root cause of performance divergence between DX51D and DX53D lies in their chemical composition. Both are low-carbon steels, but DX53D uses ultra-low carbon and microalloy control to achieve higher ductility.
The table below shows the standard chemical composition limits (weight percentage, wt%) according to EN 10346:
| Element | DX51D (1.0226) | DX53D (1.0228) | Effect on Performance |
|---|---|---|---|
| Carbon (C) | ≤ 0.12% | ≤ 0.08% | Lower carbon in DX53D greatly improves ductility and deep drawability |
| Manganese (Mn) | ≤ 0.60% | ≤ 0.50% | Reduced manganese reduces hardness and improves forming behavior |
| Silicon (Si) | ≤ 0.08% | ≤ 0.06% | Minimizes coating defects and improves surface quality |
| Phosphorus (P) | ≤ 0.025% | ≤ 0.020% | Lower impurities reduce brittleness during deep drawing |
| Sulfur (S) | ≤ 0.030% | ≤ 0.025% | Fewer inclusions prevent cracking during severe deformation |
| Ti / Nb | Optional | Stabilized (Ti or Nb added) | Microalloys stabilize carbon, eliminate hardening, and enhance formability |
| Iron (Fe) | Balance | Balance | Base material matrix |
In short, DX51D is a general-purpose low-carbon steel, while DX53D is an ultra-low-carbon, stabilized interstitial-free steel designed specifically for deep drawing.
Mechanical Properties Comparison: DX51D vs DX53D
Mechanical properties directly reflect the difference between DX51D and DX53D in actual processing. DX53D has lower yield strength, higher elongation, and better plastic deformation ability.
| Property | DX51D | DX53D |
|---|---|---|
| Tensile Strength | 270 – 500 MPa | 270 – 450 MPa |
| Yield Strength (ReH) | ≤ 360 MPa | ≤ 320 MPa |
| Elongation (A80) | ≥ 22% | ≥ 26% |
| r-value (plastic strain ratio) | ≥ 1.0 | ≥ 1.4 |
| Hardness (HRB) | 55 – 75 | 45 – 65 |
| Formability Level | General cold forming | Deep drawing |
DX51D: Higher strength and hardness, suitable for bending, roll forming, and simple stamping.
DX53D: Lower yield strength, higher elongation, and higher r-value, allowing greater deformation without thinning or cracking.
Formability and Processing Performance
The most intuitive difference between DX51D and DX53D is their performance during fabrication.
DX51D Formability
Suitable for simple bending, rolling, punching, and light stamping
Can achieve 180° bending over a small radius
May crack or spring back significantly in complex deep-drawn parts
Ideal for profiles, panels, and structural parts with low deformation
DX53D Formability
Designed for medium to deep drawing applications
Excellent resistance to thinning and edge cracking
Minimal springback, high dimensional stability
Suitable for parts requiring multiple drawing operations
Better surface finish after forming
If you use DX51D to produce parts that require DX53D, you will face high rejection rates, tool wear, and production delays.
Typical Applications of DX51D and DX53D
Due to their performance differences, DX51D and DX53D serve completely different application fields.
Typical Applications for DX51D
Roofing sheets, wall cladding, corrugated panels
C/Z purlins, cable trays, guardrails, floor decking
General brackets, shelves, enclosures, and simple stamped parts
Agricultural equipment shells and structural components
Typical Applications for DX53D
Refrigerator cabinets, air conditioner housings, washing machine parts
Automotive body components, inner panels, brackets, and structural parts
Deep-drawn metal shells for electrical appliances
Precision metal components requiring smooth surface and complex shape
Key Summary of Differences Between DX51D and DX53D
To help you quickly distinguish and select materials, here are the core points:
DX51D is for general forming; DX53D is for deep drawing.
DX53D has lower carbon and impurities, making it softer and more ductile.
DX53D has higher elongation and r-value, preventing cracking in complex parts.
DX51D is more cost-effective for simple projects.
DX53D is required for high-formability applications to ensure production stability.
Frequently Asked Questions (FAQ)
1. Can DX51D replace DX53D?
Only for simple bending and roll forming. For deep drawing or complex stamping, DX51D will crack, so replacement is not recommended.
2. Is corrosion resistance different between DX51D and DX53D?
No. Corrosion resistance depends on zinc coating weight (Z60, Z275, etc.), not the steel grade. Both have the same coating performance.
3. Are DX51D and DX53D weldable?
Both have excellent weldability. DX53D's ultra-low carbon makes welding even easier with less risk of hardening.
4. Which one is more expensive?
DX53D is usually more expensive than DX51D due to stricter smelting and composition control.
5. What standards do DX51D and DX53D follow?
Both comply with EN 10346 – Continuously hot-dip coated steel flat products for cold forming.
Choosing between DX51D and DX53D directly affects your production efficiency, product quality, and overall cost. DX51D remains the most economical solution for general forming, while DX53D is the reliable choice for deep-drawn components.
