1. What is DX57D+Z?
DX57D: A low-carbon steel grade, cold-rolled for stamping applications, offers excellent formability and ductility, making it suitable for complex stamping processes (such as deep drawing and stretching).
+Z: Indicates that the surface has been hot-dip galvanized (zinc coating). The zinc layer adheres to the steel surface, providing corrosion protection.
2. Key Characteristics
Base Material Properties:
Low carbon content (C ≤ 0.12%), high plasticity, and low yield strength (typically ≤ 260 MPa).
Excellent deep drawing performance (elongation ≥ 30%), making it suitable for complex parts.
Galvanized Coating:
The zinc coating weight is typically 40-90 g/m² (double-sided) (common designations include Z60 and Z80, where the number indicates the total weight in grams per side).
Surface treatments may include passivation (chromate), oiling, or no treatment to meet varying rust protection requirements.
3. Implementation Standards
Common Standards:
JIS G 3302 (Japanese Standard, similar to SGCC).
EN 10346 (European Standard, corresponding to DX57D+Z).
GB/T 2518 (Chinese Standard, similar to DC57D+Z).
Zinc Coating Codes: For example, Z60 (60g/m² on both sides), Z80 (80g/m² on both sides).
4. Typical Applications
Automotive: Fuel tanks, chassis parts, and interior trim (requiring high formability).
Home Appliances: Washing machine panels, refrigerator housings, and air conditioner components.
Construction: Lightweight steel structures, roofs, and gutters (requiring corrosion resistance and complex shapes).
5. Comparison with Similar Grades
Grade Standard Property Comparison Common Applications
DX57D+Z EN 10346 High ductility, medium strength Deep-drawn parts
DX54D+Z EN 10346 Slightly lower formability, lower cost General stamping parts
SGCC JIS G 3302 Similar to DX57D, but with a different standard system Japanese home appliances/construction
6. FAQs
Q1: Can DX57D+Z replace DX54D+Z?
If a part requires higher ductility (such as deep drawing), DX57D is recommended; for simple forming, DX54D is more economical.
Q2: How should the zinc layer thickness be selected?
For outdoor or high-humidity environments (such as buildings), Z80 or higher is recommended; for indoor home appliances, Z60 is recommended.
Q3: Does the appearance of zinc spangles on the surface affect performance?
Spangle is a crystalline pattern in zinc plating. It does not affect corrosion resistance, but may affect the appearance of the spray coating. Minimized spangle treatment should be selected as needed.
7. Precautions
Storage: Avoid moisture to prevent zinc oxidation and white rust.
Welding: The zinc coating releases zinc vapor at high temperatures. Ventilation or the use of specialized welding consumables is required.
For more specific parameters (such as mechanical properties and tolerances), it is recommended to refer to specific standard documents or supplier technical data.
