1.What does DX51D mean?
D: Stands for "hot-dip galvanized."
X: Stands for "cold-rolled base plate."
51: Stands for "steel grade code." 51 is the base grade.
Characteristics: DX51D is a common commercial-grade galvanized steel characterized by good formability but relatively low strength. It is not suitable for structural load-bearing or high-strength applications.
Minimum yield strength: Typically 140-300 MPa (depending on base plate thickness and standard requirements).
Minimum tensile strength: Typically 270-500 MPa.
Elongation: Relatively high, ensuring good forming capabilities (e.g., bending and stamping).
2.What are the main applications of DX51D?
Thanks to its excellent formability and corrosion resistance, DX51D+Z (zinc coating) is widely used in applications where strength requirements are low but forming and rust prevention are required:
Construction: Roofing, wall panels, gutters, downspouts, and ventilation ducts (non-load-bearing).
Home appliances: Refrigerator, washing machine, air conditioner casings, and internal structural components.
Furniture: Office furniture and storage cabinets.
Automotive: Interior trim and non-structural coverings.
General industry: Computer chassis and cabinets, instrument housings, lighting fixtures, and other metal containers and products.
3.How is the zinc layer weight of DX51D expressed?
The grade designation (DX51D) alone does not include information about the zinc coating thickness. The zinc coating weight must be specified separately, typically as follows:
ZXXX: Indicates the total zinc coating weight on both sides (g/m²), e.g., Z100, Z140, Z180, Z200, Z225, Z275. The higher the number, the thicker the zinc coating and the better the corrosion resistance.
XXX/XXX: Sometimes, this also indicates the different zinc coating weights on both sides (less common).
For example, DX51D+Z275 indicates a DX51D substrate with a total zinc coating weight of 275 g/m² on both sides.
4.What is the main weight of the zinc layer of DX51D?
Must be specified additionally (e.g. Z100, Z140, Z180, Z200, Z275, etc.)
5.What should we pay attention to when purchasing?
The complete grade number must be confirmed: Simply stating "DX51D" is incomplete; the coating type (D/A/S/M) and zinc coating weight (e.g., Z275) must be included. Examples of complete grades include: DX51D+Z275 or EN10346 DX51D Z275.
Specify the intended use: Confirm whether the material's formability and strength meet your product requirements. If higher strength is required, select a higher steel grade (e.g., DX52D, DX53D, DX54D) or a different standard (e.g., S-series structural-grade galvanized steel).
Surface requirements: Pure zinc coating (D) has a bright finish, while zinc-iron alloy coating (A) has a matte off-white finish, which can affect the final product's appearance and subsequent painting process.