Steel Wire Drawing

Drawn wire—also known as cold-drawn wire—refers to steel wire products manufactured from hot-rolled wire rods through one or more cold-drawing passes using a wire-drawing die at room temperature. During the drawing process, the metal's cross-sectional area decreases while its length increases; simultaneously, cold work hardening occurs, resulting in higher strength, more precise dimensions, and a smoother surface finish. Drawn wire serves as a pivotal foundational material in the metal products industry chain, linking upstream hot-rolled wire rods to a wide range of downstream applications, including fasteners, springs, steel wire ropes, welding wires, and tire reinforcement materials.

Product Classification
Wire rod for drawing can be categorized into the following main types based on material and application:
Low-Carbon Steel Wire Rod
Produced from low-carbon steel wire rod (typically with a carbon content below 0.25%), this material offers good plasticity and toughness and represents the highest-volume product in the wire drawing sector. Common grades include Q195, Q215, Q235, and the SAE1006–SAE1022 series. Notably, Q195 (carbon content 0.06%–0.12%) and Q235 (carbon content 0.14%–0.22%) are widely used for manufacturing nails, wire mesh, construction binding wire, and cold-rolled ribbed steel bars. Ultra-low carbon grades, such as BGHC15, feature phosphorus and sulfur contents controlled below 0.005%, making them suitable for manufacturing ultra-fine cables and high-performance electronic components.
Medium- and High-Carbon Steel Wire Rod
Produced from medium- and high-carbon steel wire rod (typically with a carbon content above 0.45%), this material achieves high strength and hardness after drawing. It is primarily used for springs, steel wire ropes, and prestressed steel products. Common grades include 45#, 60#, 70#, and 82B (carbon content 0.78%–0.85%). Grade 82B is the most common choice for manufacturing prestressed steel strands, while 87Mn is used for high-strength wire rope steel capable of reaching tensile strengths of 2060 MPa.
Alloy Steel Wire Rod
Produced from alloy steel wire rod—with common grades including 20Cr, 40Cr, and 60Si2Mn—this material offers superior strength, hardenability, and wear resistance compared to carbon steel. It is suitable for high-strength fasteners, springs, and mechanical components.
Stainless Steel Wire Rod
Produced from stainless steel via drawing, these wires are classified by microstructure into austenitic, ferritic, duplex, and martensitic types. Mainstream grades include 304, 304L, 316, 316L, and 430. Grade 304 is a general-purpose, corrosion-resistant alloy; Grade 316 offers superior resistance to marine corrosion due to its molybdenum content; and Grade 316L is used in precision applications as it does not require annealing after welding. The drawn stainless steel wire ranges in diameter from 0.05 mm to 14.0 mm and is available in three delivery conditions: soft, light-drawn, and cold-drawn.

Surface and Delivery Conditions
Drawn wire can be classified by surface treatment as follows:
Bright Drawn: Features a bright surface and high dimensional accuracy; suitable for precision parts and fasteners.
Black Annealed: Features a black oxide film surface; lower cost; used for agricultural and general construction purposes.
Galvanized: Treated via electro-galvanizing or hot-dip galvanizing; offers excellent corrosion resistance.
Phosphated: Features a phosphate coating; improves lubrication for subsequent cold heading or drawing processes.

Key Applications
Fastener Manufacturing: Drawn wire serves as the primary raw material for standard parts such as bolts, nuts, and screws; after the drawing process achieves precise dimensions and superior surface quality, the wire proceeds to cold-heading and forming stages.
Nail and Wire Mesh Production: Low-carbon steel wire is widely used for making nails, wire mesh, fencing, and construction binding wire; common grades include Q195 and SAE1006.
Spring Manufacturing: Medium-to-high carbon steel and alloy steel wires are drawn and processed into various springs used in automotive suspensions, valve springs, and return mechanisms for home appliances.
Steel Wire Ropes and Strands: High-carbon steel wires (such as grade 82B) are drawn and stranded to produce steel wire ropes and prestressed steel strands for use in bridges, lifting equipment, elevators, and other engineering projects.
Tire Reinforcement Materials: Cold-drawn steel cord is used in automotive radial tires to enhance strength and wear resistance.
Welding Consumables: Low-carbon steel wire is drawn and copper-plated to produce gas-shielded welding wire, a critical consumable for joining metal structures.
Construction and Infrastructure: Used to produce construction steel products such as cold-rolled ribbed steel bars, welded steel mesh, and PC (prestressed concrete) steel bars.
Precision Micro-wires: Ultra-fine drawn wires with diameters under 0.05 mm are used in the manufacture of electronic components, medical devices, and precision instruments.

Key Standard Systems
Standards for Wire Rod Raw Materials (Base Material for Wire Drawing)

Standard for Finished Drawn Wire

Diameter Range
The diameter range for wire drawing is extremely broad, spanning the entire spectrum from coarse to fine drawing: