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Help CenterSteel Wire & GB Standard Steel Wire，Q195、Q215、Q235、SWRM10、SWRM12、35#、45#、50#、SWRH45A、SWRH50A、65#、70#、75#、80#
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Steel Wire & GB Standard Steel Wire，Q195、Q215、Q235、SWRM10、SWRM12、35#、45#、50#、SWRH45A、SWRH50A、65#、70#、75#、80#NegotiableMOQ: 5 Metric Tons -
Steel Wire & GB Standard Steel Wire，Q195、Q215、Q235、SWRM10、SWRM12、35#、45#、50#、SWRH45A、SWRH50A、65#、70#、75#、80#NegotiableMOQ: 5 Metric Tons
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Steel Wire & GB Standard Steel Wire，Q195、Q215、Q235、SWRM10、SWRM12、35#、45#、50#、SWRH45A、SWRH50A、65#、70#、75#、80#NegotiableMOQ: 5 Metric Tons
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Steel Wire & GB Standard Steel Wire，Q195、Q215、Q235、SWRM10、SWRM12、35#、45#、50#、SWRH45A、SWRH50A、65#、70#、75#、80#NegotiableMOQ: 5 Metric Tons
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Steel Wire & GB Standard Steel Wire，Q195、Q215、Q235、SWRM10、SWRM12、35#、45#、50#、SWRH45A、SWRH50A、65#、70#、75#、80#NegotiableMOQ: 5 Metric Tons
Detailed Description of Steel Wire Products
Steel wire is a linear steel product made from hot-rolled wire rod through cold drawing, heat treatment and surface treatment. It is one of the four major products in the iron and steel industry (plates, pipes, sections, wires). The following is a detailed description from six aspects: classification, material and specification parameters, manufacturing process, core performance characteristics, main application scenarios, packaging, storage and transportation.
I. Product Classification (by Core Dimensions)
1. By Chemical Composition (Carbon Content)
Low-carbon steel wire (C≤0.25%): Soft and tough, easy to process, used for binding wire, nail making, wire mesh, packaging, etc.
Medium-carbon steel wire (C=0.25%–0.60%): Medium strength, used for springs, mechanical parts, shafts, etc.
High-carbon steel wire (C≥0.60%): High hardness and high strength, used for piano strings, tire cords, steel wire ropes, springs, etc.
Alloy steel wire: Contains elements such as Cr, Ni, Mo, such as bearing steel wire and spring steel wire, used in corrosion-resistant, high-temperature resistant and high-strength scenarios.
2. By Cross-sectional Shape (GB/T 341-2008)
Round steel wire: Most commonly used, with a diameter of 0.1–10mm.
Special-shaped steel wire: Square, rectangular, flat, trapezoidal, triangular, hexagonal, Z-shaped, elliptical, etc., used for special structures (such as springs, retaining springs, steel wire ropes).
3. By Diameter Size (mm)
Ultra-fine: ＜0.1
Fine: 0.1–0.5
Thin: 0.5–1.5
Medium: 1.5–3.0
Thick: 3.0–6.0
Thicker: 6.0–8.0
Ultra-thick: ＞8.0
4. By Surface Treatment
Bright steel wire: No coating, natural color, used in general environments.
Galvanized steel wire: Electrogalvanized (thin zinc layer, beautiful appearance), hot-dip galvanized (thick zinc layer, corrosion-resistant, long service life).
Copper-plated steel wire: Enhances conductivity and weldability, used for welding electrodes, cables, and rubber reinforcement.
Nickel/chromium-plated steel wire: Corrosion-resistant, high-temperature resistant, and decorative, used in chemical industry, medical equipment, and high-end products.
Plastic-coated steel wire: PVC/PE coating, insulating, corrosion-resistant, wear-resistant, used for fences, horticulture, and protective nets.
5. By Strength Level (MPa)
Low strength: ＜390
Lower strength: 390–785
Ordinary strength: 785–1225
Higher strength: 1225–1960
High strength: 1960–3135
Ultra-high strength: ＞3135
II. Material and Specification Parameters
1. Common Grades (National Standard/Japanese Standard/American Standard)
Low-carbon steel: Q195, Q215, Q235, SWRM10, SWRM12
Medium-carbon steel: 35#, 45#, 50#, SWRH45A, SWRH50A
High-carbon steel: 65#, 70#, 75#, 80#, SWRH65A, SWRH72A, SWRH82A
Alloy: 60Si2Mn (spring), GCr15 (bearing)
2. Chemical Composition (Typical Values, wt%)
Grade |
C |
Si |
Mn |
P≤ |
S≤ |
Q235 |
0.14–0.22 |
0.12–0.30 |
0.30–0.65 |
0.045 |
0.050 |
45# |
0.42–0.50 |
0.17–0.37 |
0.50–0.80 |
0.035 |
0.035 |
72A |
0.70–0.75 |
0.12–0.32 |
0.30–0.60 |
0.025 |
0.025 |
3. Specification Expression
Round: ΦDiameter (e.g., Φ2.0mm)
Special-shaped:Side length × Side length (square wire), Width × Thickness (flat wire)
Implementation Standard: GB/T 3428 (Galvanized), GB/T 1220 (Alloy)
III. Manufacturing Process
Raw Material: Hot-rolled wire rod (diameter 5.5–14mm).
Pickling: Remove surface oxide scale (hydrochloric acid/sulfuric acid).
Cold Drawing: Drawing through a wire drawing die at room temperature to reduce diameter and improve strength (work hardening).
Heat Treatment (as needed):
Annealing: Soft state, improving plasticity (low-carbon steel wire).
Lead Bath Quenching: For high-carbon steel wire, achieving high strength and high toughness (steel wire ropes, springs).
Quenching and Tempering: For medium-carbon/alloy steel wire, achieving comprehensive mechanical properties.
Surface Treatment: Galvanizing, copper plating, plastic coating, polishing, etc.
Finished Product: Wound into coils (conventional) or straight bars (special).
IV. Core Performance Characteristics
Mechanical Properties: Tensile strength, yield strength, elongation, number of twists, number of bends (key indicators, tested according to standards).
Corrosion Resistance: Galvanized/plastic-coated steel wire can be used in humid, acid-base environments for a long time (the service life of hot-dip galvanized steel wire can reach 20–30 years).
Conductivity: Copper-plated/low-carbon steel wire has good conductivity, used for electrical appliances and cables.
Wear Resistance: High-carbon/alloy steel wire has high hardness and wear resistance (tire cords, conveyor belts).
Flexibility: Low-carbon/soft steel wire is easy to bend and weave (wire mesh, binding).
V. Main Application Scenarios
Construction Engineering: Binding wire, steel mesh, prestressed steel wire, steel strand, fence netting.
Industrial Manufacturing: Springs (automotive, machinery, furniture), steel wire ropes (hoisting, mining, bridges), nail making, screws, rivets, welding electrodes, cables, rubber reinforcement (tires, conveyor belts).
Agriculture and Horticulture: Greenhouse frames, grape trellises, orchard fences, flower binding.
Communication and Power: Overhead wires, communication wires, lightning rods, cable shielding layers.
Medical Equipment: Steel wire (sutures, braces, stents).
Daily Necessities: Clothes hangers, wire baskets, crafts, stationery (paper clips, staples).
VI. Packaging, Storage, Transportation and Acceptance
1. Packaging
Coiled: Bundled packaging (steel strip/plastic strip), each coil weight 25–200kg (customizable).
Straight bars: Bundled (50–100 pieces per bundle) with both ends protected.
Marking: Labels indicate specification, grade, strength level, surface treatment, batch number, implementation standard, production date, manufacturer.
2. Storage and Transportation
Storage: Store in a dry, ventilated, moisture-proof and rain-proof place, avoid acid-base corrosion, and keep away from heat sources.
Transportation: Handle with care, avoid dropping, squeezing and scratching the surface; galvanized/plastic-coated steel wire needs to protect the coating.
3. Acceptance
Appearance: Smooth surface, no cracks, no rust, no burrs, uniform coating.
Size: Diameter tolerance meets the standard (±0.02–±0.1mm, according to specification).
Performance: Sampling test of tensile strength, elongation, number of twists/bends, which meet the standard requirements.
Material: Chemical composition analysis (if necessary), which meets the grade requirements.
VII. Core Implementation Standards
GB/T 341-2008: Classification and Terminology of Steel Wire.
GB/T 3428-2012: Galvanized Steel Wire for Steel Strand.
GB/T 1220-2007: Alloy Structural Steel Wire.
GB/T 5952-2018: Spring Steel Wire.
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