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Black Annealed Wire

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Introduction to Black Annealed Wire

Definition
Black annealed wire is a type of low-carbon steel wire processed through an annealing technique. By heating it to high temperatures and cooling it slowly, the wire’s hardness is reduced while its flexibility is enhanced, making it suitable for applications requiring repeated bending or binding.

Manufacturing Process
Using Q195 high-quality low-carbon steel coils as raw materials, the wire is drawn into various diameters. It then undergoes annealing in a furnace or via a heat-pipe annealing process, where controlled cooling restores its plasticity, resulting in a soft and uniform black annealed wire.

Key Features
High Flexibility: Soft and easy to bend without breaking after annealing.
Uniform Color: Surface unfold dark black or grayish-black with minimal aberration.
Good Elasticity: Can withstand moderate tensile forces for secure binding.
Versatile Sizes: Diameters range from 0.17mm to 4.5mm (wire gauge 5#-38#), with customizable options.

Applications
Construction: Rebar tying, scaffold fixation, concrete formwork reinforcement.
Industry: Mine support, chemical equipment bundled，welded mesh, and processing of crafts.
Daily Use: Gardening binding，packaging sealing, temporary fixation.

Specifications & Packaging
Wire Diameters: Available in SWG (British Standard), BWG (Birmingham Wire Gauge), and Metric systems (e.g., 3.5mm/10#, 2.8mm/12#).
Packaging: Inner plastic and outer jute/woven bag wrapping, with bundle weights of 50-1000kg. Small rolls (e.g., 2kg/roll) and custom packaging are also supported.

Chemical Composition & Properties
Material: Q195 low-carbon steel (C: 0.06-0.12%, Mn: 0.25-0.50%, low S/P impurities).
Mechanical Properties: Tensile strength 315-430MPa, yield strength 195MPa, elongation ≥33%, balancing strength and ductility.

Differences from Other Wires
Cold-Drawn Wire: Smooth, glossy surface; hard and brittle; used for welded mesh or precision parts.
Galvanized Wire: Zinc-coated for rust resistance; slightly less flexible; suitable for outdoor/wet environments.

Advantages
Cost-effective for large-scale binding needs.
Readily customizable for secondary processing (e.g., plastic coating, U-shaped wire cutting).

Application Example
In construction, black annealed wire ties rebar cages. Its flexibility reduces installation difficulty, improving construction efficiency, while the annealing process enhances fatigue resistance for long-term stability.

Detailed Product Information of Black Annealed Wire


1. Product Definition & Core Process

  • Definition: Black annealed wire is made from Q195 low-carbon steel coils through cold drawing and annealing. By controlling heating temperature (650-750℃) and cooling rate (2-4 hours/furnace), internal stress is eliminated, enhancing plasticity and toughness.
  • Key Processes:
    • Cold Drawing: The coil is drawn to the target diameter (tolerance ±0.03mm).


    • Annealing: Continuous or box-type furnaces ensure uniform temperature (nitrogen protection optional to prevent oxidation).

    • Surface Treatment: Optional anti-rust oil or phosphating for storage stability.


2. Technical Parameters & Specifications

  • Chemical Composition (GB/T 701-2008):
    ElementCMnSiSP
    Content≤0.12%≤0.50%≤0.30%≤0.045%≤0.045%
  • Mechanical Properties (GB/T 343-2012):
    PropertyValue Range
    Tensile Strength315-430 MPa
    Elongation≥33% (200mm gauge)
    Repeated Bends≥6 times (φ1.0mm wire)
  • Specifications:
    • Diameter: 0.17mm (38#) to 4.5mm (5#), with custom sizes available.
    • Gauge Standards: British SWG, American AWG, or Metric (mm).


3. Product Features & Advantages

  • Physical Properties:
    • Flexibility: Can be manually coiled 360° without cracks (compared to brittle cold-drawn wire).
    • Elastic Modulus: ~200 GPa, fatigue resistance improved by 40% (annealing reduces lattice defects).
  • Cost Efficiency:
    • 20% cheaper than galvanized wire for non-corrosive environments.
    • Replaces high-cost alloy wires for basic tying needs.


4. Typical Application Scenarios

  • Construction:
    • Rebar cage tying in high-rise buildings (φ3.0-4.0mm).
    • Bridge formwork fixation (used with U-shaped wire).
  • Industrial Manufacturing:
    • Automotive seat spring frameworks (φ1.5-2.5mm).
    • Mine support mesh weaving (φ2.0-3.5mm).
  • Agriculture & Home Use:
    • Grape trellis binding (φ1.0-1.5mm).
    • Furniture packaging reinforcement (φ0.8-1.2mm).


5. Packaging & Transportation

  • Standard Packaging:
    • Inner: PE film wrapping for oxidation prevention (2-50kg/roll).
    • Outer: Woven bag + steel strapping (100-1000kg/bundle).
  • Transportation Tips:
    • Marine: Moisture-proof paper in containers (humidity ≤60%).
    • Land: Avoid mixing with acidic goods to prevent corrosion.


6. Quality Control & Certifications

  • Testing Standards:
    • Appearance: GB/T 2976-2014 (no rust or scratches).
    • Mechanical Properties: Batch sampling for tensile/bend tests.
  • Certifications:
    • ISO 9001 Quality Management System.
    • Optional third-party certifications (e.g., SGS, BV).


7. FAQs

  • Q: Can black annealed wire replace galvanized wire?
    A: Suitable for short-term indoor use; outdoor applications require anti-rust coating.
  • Q: How to choose wire diameter?
    A: Based on load requirements (e.g., φ3.0mm+ for rebar tying, φ0.5-1.0mm for crafts).


Customization Services: Available for diameter, packaging, and length (cut-to-size). Free samples provided for testing.


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