Cold Rolled Galvanized Steel Sheet
Cold Rolled Galvanized Steel Sheet pairs the strict dimensional tolerances and smooth surface finish of a cold-rolled substrate with a tightly bonded zinc protective layer applied through continuous hot-dip or electro-galvanizing lines, delivering high formability for complex deep-drawing and sacrificial barrier protection against atmospheric corrosion.
Technical Specifications
|
Parameter |
Specification / Range |
|
Executive Standards |
ASTM A653/A653M, EN 10346, JIS G3302 |
|
Substrate Grades |
Commercial (CS Type A/B/C), Structural (SS33-80), DC01-DC06, DX51D-DX57D |
|
Thickness Range |
0.30 mm to 3.00 mm (±0.02 mm tolerance) |
|
Width Range |
600 mm to 1500 mm (Coils, Slit Strips, Sheared Sheets) |
|
Coating Designation |
Z60 to Z275 (G30 to G90) |
|
Surface Finish |
Minimized Spangle, Zero Spangle, Regular Spangle |
|
Surface Treatment |
Chemical Passivation, Oiled (1.0–2.0 g/m² per side) or Dry |
Mechanical Performance
Yield & Tensile Strength
Commercial grades: Yield 140–300 MPa, Tensile 270–410 MPa.
Structural grades: Minimum yield up to 550 MPa for load-bearing applications.
Formability & Elongation
Elongation values range from 20% to 38% minimum based on gauge thickness.
Supports severe bending, roll forming, and deep drawing without zinc flaking.
Hardness Profile
Rockwell hardness controlled between HRB 50 and HRB 85 for consistent stamping die interaction.
Surface Finishes
Skin-Passed Uniformity: Temper rolled to eliminate yield point elongation and suppress stretcher strains, providing a uniform matte finish for direct powder coating.
Spangle Control: Zero spangle processing yields a smooth, grain-free topography required for high-visibility architectural panels and automotive exteriors.
Protective Passivation: Chromium-free passivation films applied inline to inhibit wet storage stain during transit and storage.
Typical Applications
Automotive Manufacturing: Inner body panels, structural reinforcements, chassis brackets, and anti-intrusion beams.
HVAC & Ventilation Systems: Spiral air ducts, damper blades, fan housings, and modular air handling unit panels.
Home Appliances: Structural chassis, drum wrappers, and side panels for washing machines and commercial refrigerators.
Industrial Enclosures: Electrical switchgear cabinets, telecommunication outdoor racks, and generator soundproof housings.
Quality Control
Inline Monitoring: Continuous X-ray thickness measurement and magnetic induction coating weight sensors across the entire coil length.
Laboratory Testing: Batch tensile testing, Erichsen cupping tests for formability, and bend tests verifying metallurgical bonding.
Corrosion Verification: Neutral salt spray testing executed in accordance with ASTM B117.
Mill Certification: Every production lot issued with an EN 10204 3.1 Mill Test Report detailing chemical composition, mechanical values, and coating weight measurements.
Customization Capabilities
Substrate Selection: Tailored base metal sourcing ranging from extra-deep drawing quality (EDDQ) interstitial-free steels to high-strength low-alloy (HSLA) grades.
Precision Dimensioning: Precision slitting down to 25 mm strip widths and blanking to exact rectangular dimensions with diagonal tolerances within 1.0 mm.
Differential Coating: Customized zinc mass distribution (e.g., heavier coating on the corrosive-exposed side and lighter mass on the interior side).
Advanced Surface Treatments: Phosphated surfaces for enhanced paint adhesion or fingerprint-resistant nano-coatings for exposed appliance panels.
Packaging & Delivery
Export-Grade Packaging: Coils and sheets wrapped in moisture-barrier VCI polyethylene film, backed with waterproof kraft paper, and protected by corrugated steel edge protectors.
Securing & Palletizing: Secured with circumferential and radial steel strapping; cut sheets stacked on fumigation-free wooden pallets with top and bottom protective lids.
Transit Protection: Containerized loading with desiccant placement for ocean freight, preventing moisture ingress during long-distance transport.
Frequently Asked Questions
Q: What is the difference between zero spangle and regular spangle finishes?
A: Zero spangle is produced by skin-passing and specialized cooling processes that eliminate visible zinc crystal grains, resulting in a smooth surface ideal for immediate painting. Regular spangle exhibits natural solidified zinc crystals and suits general industrial applications.
Q: How does coating mass designation (Z275) translate to thickness?
A: Z275 denotes a minimum total triple-spot average zinc coating mass of 275 g/m² on both sides, equating to approximately 20 micrometers of zinc thickness per side.
Q: Can this material be laser cut and resistance welded?
A: Yes. Tight thickness tolerances and clean surfaces permit high-speed fiber laser cutting, while controlled carbon equivalents support spot and MIG welding.
Q: What documentation is included with each shipment?
A: Each delivery includes a packing list, bill of lading, commercial invoice, and a certified EN 10204 3.1 Mill Test Report.
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