I. Material Characteristics
Corrosion Resistance
The zinc coating (pure zinc or zinc-iron alloy) provides superior rust prevention, extending part lifespan. Hot-dipped galvanized steel (SGCC) offers better corrosion resistance than electrogalvanized steel (SECC), suitable for humid or corrosive environments.
Strength-Formability Balance
Galvanized steel combines good formability (deep drawing, bending) with enhanced strength through zinc layer thickness control (e.g., Z80 denotes 80g/m² zinc coating) to meet varying load requirements.
Surface Properties
Options include spangle-free, regular spangle, and brushed finishes. PVC film may be applied for scratch protection (e.g., aluminized-zinc steel stampings).
II. Key Application Fields
| Sector | Typical Components | Material Requirements |
|---|---|---|
| Automotive | Door impact beams, chassis brackets, A/B-pillars | Double-side galvanizing (≥50g/m²), high-strength steel (HC340/590DP) |
| Home Appliances & Electronics | Washing machine casings, AC mounts, server chassis | Electrogalvanized steel (SECC), thickness 0.5-1.5mm |
| Construction Hardware | Structural connectors, guardrails, pipe fittings | Hot-dipped galvanized steel (SGCC), zinc layer ≥85μm |
| Telecom Equipment | 5G base station enclosures, heat sinks, EMI(Electromagnetic Interference) shields | Galvalume steel (SGLD), high thermal conductivity |
III. Stamping Process Critical Points
Die Design
Precision dies control tolerances (±0.1mm); complex parts may require ≥7 progressive dies.
Use 8566 die steel for sharp corners (e.g., R0.5) to prevent DC53 punch fracture.
Processing Challenges
Zinc layer scratching requires anti-spalling measures; stainless-galvanized hybrids need optimized bending to avoid cracking.
Ultra-thin sheets (0.5mm) demand CNC punching (e.g., WKC-2000) for ±0.15mm precision.
Surface Treatment
Additional anodizing (aluminum) or anti-fingerprint coating (electronic parts) may be applied.
IV. Common Material Grades
General Stamping: DX51D+Z (hot-dipped), SECC (electrogalvanized)
Deep Drawing: DX53D+Z, SECD (high ductility)
Structural Parts: HC340/590DP (high-strength galvanized dual-phase steel)
Note: Galvanized stampings constitute 39-43% of NEV(New Energy Vehicle) components, primarily for battery enclosures and safety frames.
Galvanized steel duct
I. Basic Duct Type
Galvanized Duct
Standard HVAC ventilation duct, zinc coating ≥80g/m² (avg. thickness 45μm) for general corrosion resistance.
Welded Galvanized Steel Duct
Fabricated by welding galvanized sheets; seams require anti-corrosion treatment (e.g., zinc-rich paint ≥96% Zn content).
Spiral Galvanized Duct
Lock-seam spiral construction, diameter range Ø80–2500mm; production capacity: 3000m/day. Zinc coating: Z40 (standard) / Z80 (high-corrosion).
II. Flanged Duct Systems
| Standard English | Technical Specifications |
|---|---|
| Galvanized TDC Flange Straight Duct | Integral flange formation; reduces cost by 30% for low-pressure systems (≤1000Pa). |
| Galvanized Angle Iron Flange Straight Duct | Welded L-shaped frame (e.g., L30×3 angle iron); required for medium/high-pressure systems (>1000Pa). |
Key Notes:
TDC = Thin Duct Connector (industry-standard term)
Coating grades: Z200 (≥200g/m² zinc) mandatory for smoke extraction systems.
III. Technical Parameters Reference
Material Standards:
ASTM A653 G90 (Z275) galvanized steel for ducts
Pressure Ratings:
TDC flange: Max. 1000Pa (sealed with pressure-sensitive tape)
Angle iron flange: 1250–2500Pa (bolt-fastened)
Corrosion Protection:
Standard: Z40 coating (40g/m²)
Severe environments: Z80/Z200 coating + seam sealing
Usage Example:
"Spiral galvanized ducts (Z80) with TDC flanges achieve 60% faster assembly in commercial HVAC projects versus welded alternatives."
Galvanized Galvanized Stamping parts
Galvanized Curtain Wall Bending Components
Fabricated from aluminum alloy 6063-T5
Tolerance: ±0.5mm per meter (EN 12020-2)
Galvanized Fire-Rated Board
Type A: Calcium Silicate Board (BS 476 Class 0)
Type B: Vermiculite-Perlite Composite (ASTM E119)
Galvanized Fireproof Cladding Brackets
Galvanized steel base (AZ150 coating) + fireboard overlay
Load capacity: 1.5kN/m (UL Design No. XYZ-123)
Drainage & HVAC
| Galvanized Products | 技术参数 |
|---|---|
| Galvanized Gutter | Z275 coating (275g/m² zinc) per ASTM A653 |
| Galvanized Fabricated Carbon Steel Parts | Laser-cut S275JR steel (EN 10025) |
| Galvanized Carbon Steel Duct | 1.2mm thickness, seam welded per SMACNA |
Galvanizing process mark:
AZ150 = 150g/m² aluminum-zinc alloy coating (AS 1397)
Z275 = 275g/m² pure zinc coating (ASTM A653)
"Galvanized gutters (Z275) with 30° bends drain 200L/min rainwater from curtain wall joints, while fire-rated calcium silicate boards (BS 476 Class 0) provide 120min fire barrier at slab penetrations."
