Stainless Steel Wire and Wire Coils

Technical Specifications of Stainless Steel Wire and Wire Coils

General Product Specifications

Specification	Available Requirement
Product	Stainless steel wire, wire coils, wire rod and cut lengths
Cross-Section	Round, flat, square, rectangular or customised
Common Grades	202, 304, 304L, 316, 316L, 310, 321, 430, 410 and application-specific grades
Special Grades	Duplex, super-duplex, precipitation-hardening and high-alloy grades subject to specification
Diameter	Standard and customised wire diameters
Condition	Annealed, bright annealed, cold-drawn, hard-drawn, spring temper or as specified
Surface Finish	Bright, matt, pickled, soap-coated, polished, copper-coated or welding finish
Supply Form	Coil, spool, reel, carrier, drum or straightened cut length
Coil Weight	According to wire diameter, application and handling requirement
Dimensional Tolerance	According to applicable specification or customer requirement
Testing	Chemical, tensile, hardness, bend, wrap, coil, cast and helix tests as applicable
Documentation	Material test certificate and additional inspection documents where required
Packing	Moisture-protected, export packing or application-specific packaging

Availability depends on grade, diameter, tensile requirement, surface finish, coil size, standard and order quantity.

Stainless Steel Wire vs Stainless Steel Wire Rod

Selection Factor	Stainless Steel Wire Rod	Stainless Steel Wire
Product Stage	Semi-finished starting material	Finished or further-processed drawn product
Typical Diameter	Generally larger	Reduced through wire drawing
Surface Condition	Hot-rolled, pickled or prepared for drawing	Bright, annealed, coated, polished or as specified
Dimensional Control	Suitable for further processing	Controlled for final application
Mechanical Properties	Intended for subsequent drawing	Specified according to application
Supply Form	Large coils	Coils, spools, reels or cut lengths
Common Use	Production of wire	Springs, fasteners, mesh, welding and forming

A buyer requiring finished wire should not order “wire rod” unless the material will undergo further drawing or processing.

Types of Stainless Steel Wire

Annealed Stainless Steel Wire

Annealed wire is supplied in a softened condition to improve ductility and ease of forming. It is commonly used for binding, weaving, general fabrication, wire mesh and components requiring bending or forming.

Bright Stainless Steel Wire

Bright wire is cold-drawn and supplied with a clean, smooth surface. It is used for visible products, fasteners, formed components, kitchenware and precision applications.

Spring Stainless Steel Wire

Spring wire is manufactured to controlled tensile strength, diameter, surface quality, cast and helix requirements. It is used for compression springs, tension springs, torsion springs, clips and retaining components.

Welding Wire

Stainless steel welding wire is supplied with controlled chemical composition and feeding characteristics for MIG, TIG, submerged-arc or other approved welding processes. Welding wire must be ordered by filler classification rather than base-metal grade alone.

Cold-Heading Wire

Cold-heading wire is processed for manufacturing screws, bolts, rivets, pins and other fasteners. Surface condition, spheroidisation where applicable, ductility and heading performance are important selection factors.

Weaving and Knitting Wire

Weaving wire is used for wire mesh, screens, filters, conveyor belts and knitted-wire products. Diameter tolerance, surface finish and continuous coil length affect weaving performance.

Rope and Strand Wire

Rope wire is manufactured for stranding into stainless steel wire ropes and cables. Tensile strength, torsion performance, coating and rope construction must be specified.

Flat and Shaped Wire

Flat, square, rectangular and profile wire is used for retaining rings, clips, filters, springs, seals and customised components.

Straightened and Cut Wire

Wire can be straightened and cut into specified lengths for pins, rods, welding, fasteners and formed components.

Stainless Steel Wire Product Range

Wire Type	Common Standard	Common Grades	Typical Applications
General-Purpose Wire	ASTM A580/A580M	202, 304, 304L, 316, 316L, 410, 430	Forming, fabrication and general components
Spring Wire	ASTM A313/A313M	302, 304, 316, 17-7 PH and approved grades	Compression, tension and torsion springs
Cold-Heading Wire	ASTM A493/A493M	304, 304L, 316, 316L and fastener grades	Screws, bolts, rivets and pins
Weaving and Knitting Wire	ASTM A478	Chromium-nickel stainless grades	Mesh, screens, filters and knitted products
Wire-Rope Wire	ASTM A492 or applicable specification	Application-specific grades	Ropes, cables and lifting assemblies
Wire Strand	ASTM A368 or applicable specification	Application-specific grades	Strand and cable production
Free-Machining Wire	ASTM A581/A581M	Free-machining stainless grades	Small machined components
Welding Wire	AWS A5.9/A5.9M or applicable specification	ER308L, ER309L, ER316L, ER347 and others	MIG, TIG and welding processes
Flat and Shaped Wire	Applicable ASTM, EN or customer specification	Grade as required	Clips, rings, filters and precision components
Cut-Length Wire	Applicable wire specification	Grade as required	Pins, forming, welding and general fabrication

The applicable standard must be selected according to the wire’s final use. ASTM A580 general-purpose wire should not automatically be substituted for spring, welding, rope or cold-heading wire.

Common Stainless Steel Wire Grades

Grade	Key Characteristics	Common Wire Applications
202	Good strength and economical for mild environments	General-purpose wire, forming and indoor components
302	High work-hardening response	Springs, clips and formed components
304	General corrosion resistance and broad availability	Mesh, springs, fasteners and fabrication
304L	Lower carbon for welded components	Welding, forming and fabricated wire products
316	Improved chloride resistance compared with 304	Marine-related fittings, mesh and industrial components
316L	Low carbon with molybdenum	Welding wire, filters and chemical-processing components
310/310S	Oxidation resistance at elevated temperatures	Furnace baskets, heat-resistant mesh and components
321	Titanium-stabilised for elevated-temperature service	Heat-resistant wire products and welding applications
347	Niobium-stabilised grade	Welding consumables and high-temperature components
410	Martensitic grade with higher strength	Fasteners, pins and heat-treated components
430	Ferritic, magnetic stainless steel	Appliance, automotive and general-purpose components
17-7 PH	High-strength precipitation-hardening grade	High-performance springs and clips
2205 Duplex	Higher strength and chloride resistance	Specialised chemical and marine-related wire products

Not every grade is routinely available in every diameter, temper, finish or wire specification.

Common Standards for Stainless Steel Wire

Standard	General Coverage
ASTM A555/A555M	General requirements for stainless steel wire and wire rods
ASTM A580/A580M	General stainless steel wire
ASTM A313/A313M	Stainless steel spring wire
ASTM A478	Chromium-nickel stainless steel weaving and knitting wire
ASTM A493/A493M	Stainless steel wire and wire rod for cold heading and cold forging
ASTM A492	Stainless steel rope wire
ASTM A368	Stainless steel wire strand
ASTM A581/A581M	Free-machining stainless steel wire and wire rods
AWS A5.9/A5.9M	Bare stainless steel welding electrodes and rods
EN 10270-3	Stainless steel spring wire
EN 10088	Stainless steel grades and applicable product requirements
Customer Specification	Application-controlled chemistry, tensile, finish and packaging

The latest applicable edition and supplementary requirements should be stated in the purchase order.

Available Wire Conditions

Condition	Characteristics and Common Use
Soft Annealed	High ductility for bending, tying and forming
Bright Annealed	Soft condition with a clean, bright surface
Quarter Hard	Increased strength with useful formability
Half Hard	Higher strength for clips and formed parts
Three-Quarter Hard	Higher tensile strength with reduced ductility
Full Hard	High strength for demanding formed components
Spring Temper	Controlled tensile strength for spring manufacture
Hard Drawn	Strength increased by cold drawing
Soap Coated	Improved lubrication for further drawing or cold heading
Pickled	Scale removed for further processing
Stress Relieved	Applied to specified spring or formed-wire requirements

Terms such as “soft,” “hard” or “spring temper” should be supported by a required tensile-strength range wherever possible.

Available Surface Finishes and Coatings

Finish or Coating	Common Purpose
Bright Drawn	Clean appearance and controlled surface
Matt Finish	General industrial use
Bright Annealed	Clean, smooth surface with soft condition
Pickled Finish	Preparation for further drawing or processing
Soap Coated	Drawing and cold-heading lubrication
Nickel Coated	Selected welding and special applications
Copper Coated	Selected welding-wire feeding requirements
Polished Finish	Decorative and precision applications
Passivated	Improved surface cleanliness and passive-film condition
Custom Lubricant	Application-specific forming or heading process

The selected lubricant or coating must be compatible with the buyer’s forming, welding, cleaning and final-use requirements.

Important Mechanical Requirements

Wire performance cannot be defined by grade and diameter alone. Buyers should specify:

• Tensile-strength range
• Yield or proof strength, where applicable
• Elongation
• Reduction of area
• Hardness
• Wrap-test requirement
• Bend-test requirement
• Torsion requirement
• Coil-test requirement
• Fatigue requirement
• Stress-relief condition
• Permitted surface defects
• Straightness for cut lengths

For spring wire, tensile strength normally changes with diameter. One tensile value should not be applied to every wire diameter without checking the governing specification.

Cast, Helix and Coil Set

Cast and helix affect how wire feeds, straightens and behaves during automated production.

• Cast: The natural diameter of a free loop of wire.
• Helix: The vertical displacement between the ends of a free wire loop.
• Coil Set: The residual curvature retained after the wire is removed from its package.

These requirements are important for:

• Spring coiling
• Automatic welding
• Wire straightening
• Mesh production
• Fastener manufacturing
• Robotic feeding
• High-speed forming

Buyers using automatic equipment should specify acceptable cast and helix limits.

Available Wire-Coil Packaging

Packaging Form	Common Use
Loose Coil	General fabrication and manual handling
Compact Coil	Controlled handling and storage
Spool	Fine wire and machine feeding
Reel	Continuous wire processing
Carrier	High-volume production
Drum Pack	Automated welding or continuous feeding
Pay-Off Pack	Controlled high-speed unwinding
Straightened Cut Length	Pins, rods, electrodes and forming

The buyer should specify internal diameter, external diameter, coil width, maximum coil weight and pay-off direction where these affect equipment compatibility.

Applications of Stainless Steel Wire and Wire Coils

• Spring Manufacturing: Used for compression, extension, torsion and precision springs.
• Fastener Manufacturing: Used to produce screws, bolts, rivets, pins and clips through cold heading or forming.
• Welding: Used as MIG wire, TIG rod and other stainless steel welding consumables.
• Wire Mesh and Screens: Used for woven mesh, filters, sieves, screens and architectural mesh.
• Industrial Filters: Used in chemical, pharmaceutical, food-processing and filtration equipment.
• Wire Rope and Cables: Used for control cables, rigging, architectural cables and industrial rope assemblies.
• Automotive Components: Used for clips, springs, retaining parts, exhaust components and fasteners.
• Food-Processing Equipment: Used for baskets, trays, mesh and formed components in approved grades and finishes.
• Medical Equipment: Application-specific stainless wire is used for selected instruments, guides and precision components subject to controlled standards.
• Electrical and Electronics: Used for springs, connectors, screens, clips and specialised components.
• Architectural Products: Used for cables, mesh, railings, decorative screens and tension systems.
• General Fabrication: Used for binding, forming, welding, securing and customised wire products.