Editorial Technical Reference

Galvanized Steel Coil

This page explains how Galvanized Steel Coil is classified within Metal Furniture. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Galvanized steel coil is a semi-finished industrial material consisting of steel sheet coated with a protective zinc layer through hot-dip galvanization.

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Product Specifications

Technical details and manufacturing context for Galvanized Steel Coil

Definition
Galvanized steel coil is a semi-finished industrial material consisting of steel sheet coated with a protective zinc layer through hot-dip galvanization. This material serves as the primary raw input for manufacturing corrosion-resistant metal furniture components in office and industrial settings. In B2B supply chains, it's purchased in bulk by furniture manufacturers who then stamp, form, and fabricate it into structural frames, panels, and supports. The zinc coating provides sacrificial protection against rust, extending furniture lifespan in demanding environments. This material represents a critical intermediate product between steel mills and furniture assembly lines. The base steel is low-carbon steel, with a thickness ranging from 0.3 to 3.0 mm. The zinc coating class ranges from Z80 to Z275, corresponding to coating thicknesses of 7 to 42 micrometers. Coil width is typically 600 to 1500 mm, with an inner diameter of 508 to 610 mm and an outer diameter of 800 to 1800 mm. Coil weight ranges from 3 to 10 metric tons. Mechanical properties include tensile strength of 270 to 500 MPa, yield strength of 140 to 350 MPa, and elongation of 20 to 40%. Surface finishes include regular spangle, minimized spangle, or zero-spangle, with optional chromate or passivation treatment to prevent white rust. Coil tension is maintained at 3 to 8 N/mm² to ensure integrity during handling. These parameters are specified under GB/T 2518, which serves as a procurement reference. Buyers must verify model-specific values with the supplier, as actual values depend on the specific coil and application.
Working Principle
The zinc coating on galvanized steel acts as a sacrificial anode. When the steel is exposed to corrosive environments, the zinc corrodes preferentially, protecting the underlying steel substrate. This corrosion forms a stable zinc carbonate patina that further inhibits rust formation. The sacrificial action continues even if the coating is scratched, as long as zinc remains in electrical contact with the steel. This mechanism provides long-term corrosion resistance, making the material suitable for metal furniture in humid or industrial settings.
Common Materials
Low-carbon steel, Zinc
Technical Parameters
ParameterTypical rangeNotes & selection driver
Base Steel ThicknessRequired0.3–3.0 mmThickness of steel substrate before coatingGB/T 2518
Coating ClassRequiredZ80–Z275 classZinc coating classification (e.g., Z275, G90)GB/T 2518
Coil WidthRequired600–1500 mmStandard width of steel coilGB/T 2518
Coil WeightRequired3–10 kgTotal weight per coil
Surface FinishSpangle/Zero-spangle typeSurface treatment type (regular spangle, minimized spangle, smooth)GB/T 2518
Tensile Strength270–500 MPaMinimum tensile strength of base steelGB/T 2518
Yield Strength140–350 MPaDetermines formability.GB/T 2518
Elongation20–40 %Higher elongation for bending operations.GB/T 2518
Coating Thickness7–42 μmCorresponds to coating class.GB/T 2518
Inner Diameter508–610 mmMust match uncoiler mandrel.
Coil Outer Diameter800–1800 mmLimits for storage and transport.
Surface TreatmentChromated/PassivatedPrevents white rust during storage.GB/T 2518
Spangle SizeRegular/MinimizedAffects appearance after painting.
Coil Tension3–8 N/mm²Ensures coil integrity during handling.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Steel Substrate Part
    Provides structural strength and formability
    Material: Low-carbon steel
  • Zinc Coating Part
    Provides corrosion protection through sacrificial action
    Material: Zinc alloy
  • Passivation Layer Optional Part
    Prevents white rust formation during storage
    Material: Chromate or chromium-free treatment

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Galvanized Steel Coil.

Hot-Dip Galvanized Steel GI Coil Zinc-Coated Steel Coil

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (structural material, not pressure vessel)
other spec: Coating thickness: 10-275 g/m² zinc, Yield strength: 140-550 MPa, Thickness tolerance: ±0.02mm
temperature: -40°C to 200°C (continuous), up to 300°C (intermittent)
Media Compatibility
✓ Indoor furniture frames ✓ Outdoor furniture components ✓ Automotive interior structural parts
Unsuitable: Continuous saltwater immersion or highly acidic environments (pH <4)
Sizing Data Required
  • Required coil width (mm)
  • Material thickness (mm)
  • Required corrosion protection level (zinc coating weight in g/m²)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
White rust formation
Cause: Moisture accumulation, chloride exposure, or damage to the zinc coating leading to localized corrosion of the underlying steel.
Coating delamination
Cause: Poor surface preparation prior to galvanizing, entrapped hydrogen, or mechanical stress causing the zinc layer to separate from the steel substrate.
Maintenance Indicators
  • Visible white powdery deposits or blistering on the coil surface
  • Audible cracking or popping sounds during handling or uncoiling indicating coating failure
Engineering Tips
  • Implement proper storage protocols with adequate ventilation, elevation from ground, and use of desiccants to prevent moisture entrapment between coil layers.
  • Apply edge protection and use non-metallic separators during stacking to minimize mechanical damage and galvanic corrosion at contact points.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM A653/A653M - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process ISO 3575 - Continuously hot-dip zinc-coated carbon steel sheet of commercial and drawing qualities EN 10346 - Continuously hot-dip coated steel flat products for cold forming - Technical delivery conditions

Quoted from the published standard.

Manufacturing Precision
  • Thickness: +/- 0.02 mm
  • Coating Mass: +/- 10 g/m²
Quality Inspection
  • Coating Adhesion Test (Bend Test)
  • Coating Mass Measurement (Weigh-Strip-Weigh Method)

Manufacturers of Galvanized Steel Coil

5 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

HX Machinery
Tianjin, CN
Also makes: Hydraulic Press Brake, Cable Management Duct
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry
Shandong Huitong Steel Co., Ltd.
Fujian, CN
Also makes: Hot-Rolled Carbon Steel Plate, High-Strength Structural Steel Plate, Pressure Vessel Quality Steel Plate and 3 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry
Shandong Longhao Steel Group Co., Ltd.
Shandong, CN
Also makes: Hot-Rolled Carbon Steel Plate, Pressure Vessel Quality Steel Plate, High-Strength Abrasion-Resistant Steel Plate and 2 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry
Shanghai Metal Corporation
Shanghai, CN
Also makes: Power Distribution, Container Fitting, Lighting System and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry
Witop Steel Roofing
Shandong, CN
Also makes: Pre-Painted Galvanized Steel Coil
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What is the typical thickness range for galvanized steel coil used in metal furniture?

The base steel thickness typically ranges from 0.3 to 3.0 mm, as specified in GB/T 2518. The exact thickness depends on the furniture component's structural requirements.

How does the zinc coating protect the steel?

The zinc coating corrodes preferentially, acting as a sacrificial layer. It forms a protective patina that prevents rust on the steel substrate, even if the coating is scratched.

What coating classes are available?

Coating classes range from Z80 to Z275, corresponding to coating thicknesses of 7 to 42 micrometers. The class indicates the amount of zinc per unit area.

Why is it important to verify specifications with the supplier?

Actual values for thickness, coating class, mechanical properties, and other parameters can vary by batch and manufacturer. Verification ensures the material meets the specific requirements of your application.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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