Cold Rolled Dx51d+Z275 Galvanized Coil: Complete Buyer's Guide

When sourcing galvanized steel coils for construction or manufacturing, the Dx51d grade with Z275 zinc coating is one of the most specified combinations in the industry. Tianjin Taihang Iron And Steel Co., Ltd offers this exact specification — cold rolled Dx51d+Z275 zinc coated coil galvanized coil — at approximately $550 USD per ton. Here's everything you need to know before placing an order.

What Makes Dx51d+Z275 Different?

Dx51d is a deep-drawing quality steel grade under the EN10327 standard, designed for cold forming applications. The Z275 designation means 275g/m² of zinc coating — offering excellent corrosion resistance suitable for outdoor and structural applications. This combination delivers the formability needed for roll-forming, bending, and stamping, while the heavy zinc layer protects against rust for decades in most environments.

Technical Specifications That Matter

The coil is available in thicknesses from 0.12mm to 6.0mm and widths from 600mm to 1500mm, making it versatile for roofing sheets, wall panels, structural profiles, and general fabrication. The hot-dipped galvanizing process ensures uniform zinc coverage, available in normal spangle, minimized spangle, or spangle-free surface finishes. Surface treatments include passivation, oiling, lacquer sealing, and phosphating to match your downstream processing needs.

With certification from SGS and ISO, the material meets international standards including EN10147, EN10142, DIN 17162, JIS G3302, and ASTM A653. The standard inner diameter is 508mm or 610mm, compatible with most decoiling equipment.

How Dx51d+Z275 Compares to Alternatives

Compared to SGCC (commercial quality), Dx51d offers superior deep-drawing capability without cracking. Against S250GD+Z (structural grade), Dx51d prioritizes formability over strength. The Z275 coating outlasts Z100 and Z140 in corrosive environments, while remaining more economical than Z350 or Z450 coatings for most applications. For roofing and cladding where both corrosion resistance and formability matter, Dx51d+Z275 hits the sweet spot.