Hot Dip Galvanized Steel Coil DX51D+Z DX53D+Z DX54D+Z

Hot dip galvanized steel coil is a steel sheet product in which a layer of zinc is coated on the surface of a ferrous substrate to improve its corrosion resistance and extend its service life.

From the point of view of the process characteristics of hot dip galvanizing, its own corrosion resistance is superior. Compared with other processes, the zinc-iron alloy layer formed by this process is more compact, more detailed, can effectively block the air and water, reducing the possibility of oxidation occurs, for steel and other protective effect is more obvious, effectively extend the service life.

DX51D+Z, DX52D+Z, DX53D+Z, and DX54D+Z are the four most commonly specified hot-dip galvanized steel grades under EN 10346:2015, the European standard for continuously hot-dip coated low-carbon steel for cold forming. They form a progressive quality scale - from basic bending to deep drawing - with decreasing carbon content and increasing formability at each step.

1.DX51D+Z - Bending & Profiling Quality

The entry-level grade. DX51D is optimized for simple bending and roll-forming operations - it is not designed for drawing. It is the most widely available and most economical galvanized steel grade, ideal for profiles, cladding, and general construction where complex shaping is not required.

• Forming capability: Bending, profiling, simple folding
• Typical applications: Roofing sheets, wall cladding, corrugated sheets, purlins, gutters, cable trays, general construction profiles
• Thickness range: 0.45–3.00 mm

2.DX52D+Z - Drawing Quality

DX52D offers a step up in formability. With a guaranteed yield strength upper limit (300 MPa) and tighter control over mechanical properties, it is suitable for moderate drawing operations - shallow pans, simple enclosures, and formed panels that would crack DX51D.

• Forming capability: Moderate drawing, simple stamping
• Typical applications: Appliance housings, electrical enclosures, door panels, simple automotive inner panels, metal furniture
• Thickness range: 0.50–3.00 mm

3.DX53D+Z - Deep Drawing Quality

DX53D marks the transition to deep drawing. With lower carbon (≤0.10%), a tighter yield range (140–260 MPa), and a minimum elongation of 30%, it can handle significantly deeper and more complex draws than DX52D. DX53D is also a non-aging grade - its mechanical properties remain stable for at least 6 months, meaning you won't see stretcher-strain marks (Lüders lines) on formed parts.

• Forming capability: Deep drawing, complex stamping
• Typical applications: Automotive body panels, washing machine drums, complex-shaped enclosures, deep-drawn parts
• Thickness range: 0.50–3.00 mm
• Non-aging: Yes (≥6 months stability guaranteed)

4.DX54D+Z - Special Deep Drawing Quality

DX54D is the highest formability grade among the four. With ultra-low carbon (≤0.08%) and the lowest yield strength (120–220 MPa), it can withstand the most demanding deep-drawing and stretching operations. DX54D also specifies r-value and n-value (plastic anisotropy and strain hardening exponent) - technical indicators that predict how uniformly the steel will thin during deep drawing. It is fully non-aging and aluminum-killed for uniform grain structure.

• Forming capability: Special deep drawing, severe stretching
• Typical applications: Automotive outer panels (Class-A surface), oil pans, complex deep-drawn components, critical structural stampings
• Thickness range: 0.50–3.00 mm
• Non-aging: Yes; r90 ≥ 1.6, n90 ≥ 0.18

How to read this table: As you move from DX51D to DX54D, tensile strength range narrows and shifts lower (softer steel), while elongation increases (more stretch before breaking). DX54D is the only grade where r-value and n-value are guaranteed - these are the key metrics for predicting deep-drawing success.

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The suffix after the grade denotes the coating type. The most common are:

Coating mass is specified as a separate designation - for example, DX51D+Z275 means DX51D grade with a minimum 275 g/m² zinc coating (both sides combined). Common coating masses: Z100, Z140, Z180, Z200, Z225, Z275. The higher the number, the thicker the corrosion protection.

The use of hot dipped galvanized steel coils are not only a process with obvious characteristics, but also has outstanding economic value. The cost of the process itself is not high, and the economic practicality is relatively strong. And its own in the process is a comprehensive ring, to avoid the use of toxic and harmful chemicals, the subsequent waste can also be recycled, reducing the possibility of environmental pollution.

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• Sacrificial Anodic Protection: Zinc is chemically more reactive than iron. When the coating is damaged or exposed to a corrosive environment, the zinc corrodes before the iron (sacrificing itself), thereby protecting the underlying steel substrate from rust.

• Physical Barrier Protection: A complete zinc layer effectively isolates the steel substrate from oxygen, moisture, and other corrosive media in the air.

• Dual Protection: The combination of sacrificial anodic protection and physical barrier protection provides extremely long-lasting corrosion protection, with a service life several or even dozens of times longer than ungalvanized steel.

Spangle: The surface of traditional hot-dip galvanized coils typically features visible zinc crystal patterns (spangle), formed by the solidification and crystallization of the molten zinc, which provides a decorative effect. However, modern processes have also developed finishes with minimal spangle and no spangle (smoothing) to meet various requirements (e.g., requiring a smooth surface for subsequent painting).

Gnee Steel (Tianjin) Co., Ltd. supplies the full DX series (DX51D through DX57D) in +Z, +ZA, and +ZF coatings, compliant with EN 10346:2015. Mill test certificates (MTC) are provided standard - SGS, TÜV, and Bureau Veritas inspection available on request.

1.Thickness: 0.12–3.00 mm | Width: 600–1500 mm | Zinc coating: 30–275 g/m²

2.Surface: Regular / minimized / zero spangle; bright or dull finish

3.Processing: Slitting, cut-to-length, surface treatment at our own facility

4.Packaging: Standard seaworthy export packaging; custom labeling available

For grade-specific quotations or technical specification sheets: Email: sale@gneegi.com | WhatsApp: +86 15824687445

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