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Help CenterSteel Wire & Steel Wire In Stock，ASTM A641、ASTM A227/A228、EN10270、JIS G3521、DIN17223
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1. Product Overview
Carbon steel wire is manufactured from hot rolled wire rod via pickling & phosphating, multi-pass cold drawing, annealing and surface anti-corrosion treatment, only carbon & low alloy carbon steel are adopted without stainless steel. It is divided into four series by carbon content: low carbon wire, medium carbon wire, high carbon spring wire and high tensile prestressing wire. By surface finish, it includes black annealed wire, hard drawn wire, hot-dip galvanized wire, electro-galvanized wire and PVC coated wire. Round wire is mainstream, with flat, square and helical rib special-shaped wire as alternatives. It balances ductility, tensile strength and weldability, widely used in construction binding, wire mesh weaving, spring manufacturing, bridge prestressing, fence protection, hardware fasteners and steel wire rope raw materials.
2. Applicable Standards
Domestic Chinese Standards
GB/T 341-2008 Classification and Terminology of Steel Wire
GB/T 343 Low Carbon Steel Wire (General Binding & Weaving)
GB/T 4357 Carbon Spring Steel Wire (Grade B/C/D for springs)
GB/T 5224 Steel Wire for Prestressed Concrete (Bridges & Precast Components)
GB/T 15393 Galvanized Steel Wire
International Export Standards
ASTM A641, ASTM A227/A228, EN10270, JIS G3521, DIN17223
Supporting Certifications
SGS mechanical & salt spray test report, original Mill Test Certificate (MTC), CE construction material certification, zinc coating adhesion test report
3. Main Material Grades (Stainless Steel Excluded)
3.1 Low Carbon Soft Wire (C:0.06–0.22%, easy bending & welding)
Q195, Q235, SAE1006, SAE1008, SWRM6/SWRM8; for binding, nail making, welded wire mesh & breeding fence
3.2 Medium Carbon Wire (C:0.25–0.55%, balanced strength & toughness)
35#, 45#, SWRCH35K; for fasteners, chains & mechanical stamping parts
3.3 High Carbon Spring Wire (C:0.60–0.88%, high elasticity & tensile strength)
65#, 70#, 82A, SWRH72A, SWRH82B; Grade B (low stress), C (medium stress), D (high stress) for compression, tension & snap springs
3.4 High Tensile Prestressing Wire (Sorbitized high carbon treatment)
80#, 82B; low relaxation, smooth/indented surface, main reinforcement for bridges, pipe piles and large-span factories
4. Delivery Status & Surface Treatment
Black Annealed Wire (Soft State)Full annealing after cold drawing with excellent ductility, no fracture after bending, covered with black mill scale, ideal for indoor binding & mesh weaving
Hard Drawn Wire (BK Cold Drawn State)No annealing, high hardness & tensile strength, for nail making, high-strength binding & metal screen mesh
Hot-Dip Galvanized Wire (GI)Integral hot-dip galvanization with zinc coating 60–275g/㎡, superior anti-corrosion for outdoor, coastal & water conservancy fences
Electro-Galvanized Wire (EG)Thin uniform zinc coating 30–90g/㎡ with bright surface, for light industrial weaving & handicrafts
PVC Coated WirePVC outer layer on galvanized substrate, acid & alkali resistant, anti-UV for orchards & municipal isolation mesh
Bright Phosphated WireOxide-free clean surface, direct stamping & spring finishing without pretreatment
5. Complete Production Process
Hot rolled wire rod uncoiling → Pickling to remove mill scale → Phosphating & saponification lubrication → Multi-pass cold drawing to reduce diameter → Intermediate annealing (for soft wire & spring wire) → Hot-dip galvanizing / electro-galvanizing / PVC coating → Tension straightening → Coiling / fixed-length cutting → Sampling mechanical test → Surface visual inspection → Steel strapping, moisture-proof paper wrapping & wooden pallet warehousing
6. Core Technical Parameters
6.1 Size Range
Diameter: 0.10mm～16.0mm; fine wire 0.1–1.0mm, medium wire 1.0–6.0mm, heavy wire 6.0–16mm
Cross section: Round (mainstream), flat, square, indented helical rib prestressing wire
Single coil weight: 25kg–1000kg, customized small 5kg coils or straight bar 1–6m
Wire diameter tolerance: ±0.01–0.03mm for fine wire, ±0.05–0.10mm for heavy wire
6.2 Reference Mechanical Properties
Low carbon annealed wire: Tensile 350–550MPa, Elongation ≥12%, repeatable bending performance
Grade B spring wire: Tensile 1200–1600MPa, for low-load springs
Grade D high-stress spring wire: Tensile 2000–2800MPa, for construction machinery & valve high-strength springs
Low relaxation prestressing wire: Min tensile ≥1570/1860MPa, relaxation value ≤2.5%
6.3 Anti-Corrosion Index
Hot-dip galvanized neutral salt spray test 500–1500h; electro-galvanized 120–300h; PVC coated anti-UV for 5–10 years outdoor service
6.4 Surface Requirements
Free of cracks, burrs, lamination and rust pits; uniform zinc coating without missing plating or peeling; fine non-peeling mill scale for annealed wire
7. Core Product Advantages
Full carbon gradient system matching all light & heavy load scenariosLow carbon soft wire for easy processing, high carbon spring wire for long-lasting elasticity, high tensile prestressing wire for ultra-high strength, one-stop solution for weaving, spring, infrastructure & mechanical processing.
Multiple anti-corrosion options for indoor & outdoor useLow-cost black wire for indoor application; hot-dip galvanized for coastal salt spray environment; PVC coated for acid & alkali chemical workshops to cut later maintenance cost.
High dimensional accuracy to reduce processing wasteMulti-pass precision cold drawing with strict diameter tolerance, less wire breakage during nail, spring & mesh production to improve finished product yield.
Superior weldability & bending performanceLow carbon equivalent for low carbon grade, no brittle fracture during spot & electric welding; annealed soft wire can be manually bent without rebound fracture.
Customizable special-shaped cross-section for deep processingFlat wire, square wire, indented prestressing wire and corrugated wire available on demand for special machinery & prestressing engineering customization.
Sufficient spot stock & complete export supporting documentsFull-size coils in stock, support small coil splitting & straight bar cutting, supply SGS, CE & original MTC for bulk container export orders.
8. Main Application Fields
8.1 Construction Infrastructure (Largest Consumption)
Rebar binding wire, welded wire mesh, geothermal mesh, bridge prestressing wire, concrete pipe pile main reinforcement, temporary construction fence
8.2 Wire Mesh & Protection Engineering
Breeding fence mesh, municipal road guardrail, orchard PVC coated mesh, mine screen mesh, anti-theft welded mesh
8.3 Spring Manufacturing Industry
Sofa springs, valve springs, construction machinery compression springs, automobile shock absorber springs, snap springs & precision instrument small springs
8.4 Hardware Fasteners & Daily Supplies
Round nails, screw blanks, chains, craft weaving, clothes hangers & packaging binding wire
8.5 Raw Material for Steel Wire Rope & Rigging
Core wire of multi-strand steel wire rope, lifting rigging, ship cable & mine hoist wire raw material
8.6 Water Conservancy & Agriculture Outdoor Works
River protection galvanized mesh, greenhouse frame wire, livestock breeding fence, garden isolation PVC coated wire
9. Packaging, Shipment & Lead Time
Packaging Methods
Domestic standard: Each coil wrapped with moisture-proof kraft paper, cross steel strapping; small coils packed in woven bags
Export dedicated: Whole coil wrapped with thickened waterproof plastic film, fixed on IPPC fumigated wooden pallets to avoid dampness & collision during sea transportation
2. Delivery Warehouse: Spot goods shipped directly from Tianjin Port
3. Lead Time: 5–7 days for regular low carbon galvanized / black annealed wire stock goods; 10–15 days for customized high carbon spring wire, indented prestressing wire & PVC coated wire
4. Payment Term: 30% TT advance deposit, balance settled before shipment, L/C letter of credit is not accepted.
10. Mandatory Full Factory Inspection Items
Spectral chemical composition analysis of raw wire rod, strictly control harmful impurities C, S & P
Sampling tensile, elongation & cold bending test per coil; repeated bending test added for spring wire
Full inspection of wire diameter, roundness & coil weight
Additional zinc coating weight, adhesion & neutral salt spray test for galvanized wire
Visual surface inspection coil by coil to eliminate cracks, missing plating & burr defects
Original Mill Test Certificate, factory certificate and third-party SGS authoritative test report provided
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