DX51D+Z275g China Used For Ventilation Duct Galvanizing Steel Plate

GNEE STEEL can cut and process according to the size you need, and cover the surface with film to ensure product accuracy and surface quality.The surface can be coated with film to reduce surface scratches during the processing,

In ventilation duct systems, using 275 grams of galvanized sheet (with a total weight of 275 g/m ² of double-sided galvanized layer) is a common choice due to its excellent corrosion resistance, mechanical strength, and processability.

The following are specific requirements for the application of ventilation ducts:

1. Material standard requirements

• Quality of galvanized layer:

Used for DX51D+Z275g China Used for ventilation duct Galvanizing supplier galvanized grams per square meter (double-sided total, single-sided usually ≥ 137.5 grams per square meter), must comply with standards such as GB/T 2518-2019 (China) or ASTM A653 (International).
The galvanized layer should be uniform, without defects such as missed plating, nodules, cracks, etc.

• Substrate material:

Commonly used cold-rolled low-carbon steel (such as SPCC, DX51D+Z) must ensure good ductility (suitable for bending and biting processing).
Thickness selection:
The thickness range of conventional air ducts is 0.5mm~1.2mm, which is determined according to the size and pressure rating of the air ducts (such as low pressure, medium pressure, and high pressure systems).
For example:
Rectangular duct side length ≤ 300mm: optional 0.5mm;
Side length 1000mm~2000mm: 1.0mm~3.0mm is required (refer to the "Code for Acceptance of Construction Quality of Ventilation and Air Conditioning Engineering" GB50243).

2. Processing performance requirements

• Bending and biting:

Galvanized sheet needs to pass a 180 ° bending test, and the coating should not peel off.
When forming bite (such as joint corner bite, single flat bite), the edges must not crack.

• Welding performance:

If welding is required (such as flange connections), it is necessary to choose weldable galvanized sheets (some galvanized sheets require special treatment during welding, such as removing the coating or using galvanized welding wire).

3. Requirements for the production and installation of air ducts

Connection method:

Bite connection: It is necessary to ensure confidentiality and apply sealant (such as weather resistant silicone adhesive) at the bite point.

Flange connection: Galvanized sheet flanges should be made of the same material as the air duct, with bolt hole spacing ≤ 150mm.

Reinforcement measures:

Large size air ducts (with a side length greater than 800mm) need to be reinforced or compressed to prevent deformation.

275 grams of galvanized sheet is suitable for most medium and low pressure ventilation ducts, and special attention should be paid to the uniformity of the coating, the matching of plate thickness with environmental requirements, and the compliance of the processing technology. It is recommended to consult professional suppliers or test the salt spray performance of galvanized sheet in special environments.

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