Black Annealed Carbon Steel Wire — Factory Direct Supplier | Huaxia-Steel

Black annealed carbon steel wire is soft wire drawn to final gauge and annealed in a controlled atmosphere, giving it the pliability baling, tying, weaving, and mesh production demand — without the cost of coated wire. The characteristic dark oxide-free surface (bright inside the coil, dark under atmospheric handling) is why it’s called “black annealed.” Huaxia-Steel supplies black annealed wire from 0.5–5.5 mm diameter in BWG/AWG/W-metric sizes, tensile 350–550 MPa with soft-anneal elongation, in coils from 10 kg hand ties to 500+ kg machine coils, factory direct with EN 10204 3.1 certification.

Product Overview

Diameter range: 0.5–5.5 mm (BWG 24 down to BWG 4); tolerance ±0.02 mm on fine sizes to ±0.06 mm on heavy sizes.

Base wire: SAE 1006/1008/1010 low-carbon rod (C ≤ 0.10–0.13%) drawn and batch-annealed.

Tensile options: soft annealed 350–450 MPa for tying; 450–550 MPa semi-soft for mesh weaving and automated baling.

Coil formats: 0.5–25 kg small coils (hand tying), 50–100 kg spoolless coils, 200–500+ kg large coils for automatic machines.

Surface: annealed black (standard); oiled or waxed for corrosion protection in transit; bright annealed available.

Specification Table

Parameter	Range / Value
Carbon content	0.06–0.13% (grade dependent)
Tensile strength (soft annealed)	350–450 MPa
Tensile strength (semi-soft)	450–550 MPa
Elongation (soft annealed, gauge 250 mm)	≥ 15–20%
Torsion test	≥ 20 turns (per relevant wire test standard)
Diameter tolerance	±0.02 mm (≤ 1.0 mm); ±0.04 mm (1.0–2.5 mm); ±0.06 mm (> 2.5 mm)
Coil weight	10 / 25 / 50 / 100 / 200–500 kg options
Packing	Hessian/PP wrapped coils, palletized; waterproof inner wrap

Optional Grades and Related Wire Products

Product	Difference	Typical Buyer
Black annealed wire	Standard soft tying wire	Baling, construction tie wire
Bright annealed wire	Controlled-atmosphere anneal, shiny surface	Retail, weaving where finish matters
Galvanized wire (hot-dip / electro)	Zn coating 20–300 g/m²	Outdoor mesh, fencing
Black iron binding wire (double annealed)	Extra soft, high elongation	Automatic baling machines
Cut-to-length tie wire	U-shaped or straight cuts 150–500 mm	Rebar tying, bag sealing

Manufacturing Standards

Rod is drawn in stages through tungsten-carbide dies with lubricant removal before annealing; batch bell or continuous annealing at 600–750°C in protective atmosphere recrystallizes the heavily cold-worked wire, restoring ductility while keeping tensile in the soft band. Process control follows the general requirements of EN 10016 (low-carbon wire rod), with buyer-facing testing to ISO 6892-1 (tensile), torsion, and wrap tests. Consistency between coils — not just within them — is the differentiator: we run per-coil tensile sampling so automatic baling machines don’t jam on mixed-ductility stock.

Applications

Waste paper, hay, and scrap baling (manual and automatic balers)

Construction: rebar tying, scaffolding tie wire, hanging wire

Mesh and gabion weaving feedstock (pre-galvanizing draw stock)

Packaging: bag closure, carton stitching wire base stock

Handicraft, horticulture, and general-purpose binding

Quality Assurance

Per-coil (or per-lot, on agreement) tensile and elongation records

Diameter verification at 4 points per coil circumference

Torsion and wrap testing for ductility on annealed product

Coil weight accuracy: ±2% on nominal coil weight

Oil/wax protection for sea freight; 90-day indoor corrosion protection standard

EN 10204 3.1 certificates per shipment; SGS/BV inspection welcome

Packaging and Shipping

Small coils are bagged and carton-packed; large machine coils are wrapped in waterproof PP + kraft, palletized and stretch-wrapped, or packed in steel-strapped bales for full-container loads. A 20′ container carries approximately 25–27 MT depending on coil format. Marking: size, grade, coil weight, heat/lot number on each coil tag matching the MTC. Export terms EXW/FOB/CIF/DAP; documentation set issued in English before vessel departure.