What is DX51D GI Steel Coil？

DX51D Gi Coil is a galvanized steel coil, “DX51D” is the material grade of hot-dip galvanized steel coils according to the European standard EN 10346. It stands for hot-dip galvanized steel for cold forming and is suitable for processing scenarios such as bending and stamping.

“GI” (Galvavized Iron) refers to the hot-dip galvanizing process, which provides corrosion protection by dipping a steel substrate into a molten zinc solution to form an iron alloy coating. The amount of galvanization is indicated by a “Z”, e.g. Z275 means that the total amount of galvanization on both sides is 275 g/m2 each.

DX51D has regional equivalents, equivalent to SGCC (JIS standard) in China and close to certain galvanized steel grades in ASTM A653/A653M in the USA.

Meaning of DX51D Gi Coil

• DX denotes formable steel (generally cold rolled mild steel).
• 51 represents the quality grade of steel, 51 being suitable for general purposes.
• D is for Flat Steel.
• Gi (Galvanized Iron): refers to hot-dip galvanized, where a layer of zinc is applied to the surface of the steel to increase its corrosion resistance.
• Coil: Steel supplied in coils for ease of transportation and processing.

Characteristics

• Galvanized: DX51D is covered with a layer of zinc on the surface of the steel sheet through the hot-dip galvanizing process, providing excellent protection against corrosion. Common zinc coating weights include 80g/m², 120g/m², 150g/m², 275g/m², etc. (total for both sides), depending on the usage requirements.
• Substrate: Usually based on mild steel, e.g. cold rolled substrate DC01 or hot rolled substrate DD11.
• Mechanical Properties: Yield strength is usually around 250 MPa, tensile strength between 270-500 MPa and tensile strength is usually not less than 22%, depending on the thickness and plating.
• Thickness Range: common thicknesses are 0.4-3.0 mm and widths up to 1520 mm.

Processing Performance

The surface of DX51D can be color coated (PPGI/PPGL) and RAL standard colors are customized to meet the needs of architectural decoration.

The hardness grades are categorized into normal (HRB70±5) and full hardness (HRB90±5), and support cold processing such as welding, stamping, and bending.

Chemical Composition and Mechanical Properties

Chemical Composition(max. %)	C: 0.18 Si: 0.50 Mn:1.20 P: 0.12 S: 0.045 Ti: 0.30
Mechanical Properties	Tensile strength(Rm, MPa): 270-500 ElongationA80(min. %): 22

Specifications

Thickness(mm)	0.12-600
Width(mm)	600-1500
Coil ID(mm)	580-620
Coil OD	1300
Coil Weight(ton)	8-20
Zinc coating(g/m2)	140-350

Application Areas

DX51D is widely used in several industries due to its durability and workability.

Construction Industry:

• Used for roof panels, wall panels, steel structures, window profiles, drainage and ventilation systems, road guardrails, bridges, etc.

Automotive Manufacturing:

• Used for body panels, chassis components.

Appliance Manufacturing:

• Used for refrigerator and washing machine housings.

DX51D Production Line

Shanghai AIYIA Industrial Co., Ltd. supplies DX51D, DX52D, DX53D, DX54D, DX55D Gi coils.