Stainless Steel 329 Wire

Product Description

FUSHUN METAL's Stainless Steel 329 Wire is a premium duplex stainless steel wire offering an exceptional combination of high strength, superior corrosion resistance, and excellent resistance to stress corrosion cracking. With a carefully engineered chemical composition featuring a balanced ratio of austenite and ferrite phases, our 329 wire provides mechanical properties that exceed those of conventional austenitic grades while maintaining excellent corrosion resistance in challenging environments. Available in precision diameters down to 0.10mm, this specialized wire combines outstanding strength with good ductility, making it the ideal choice for demanding applications in chemical processing, offshore oil and gas, marine environments, pulp and paper industries, and other aggressive service conditions. Unlike standard austenitic or ferritic grades, FUSHUN METAL's 329 stainless steel wire offers nearly twice the yield strength of conventional austenitic stainless steels, superior resistance to chloride stress corrosion cracking, and exceptional pitting resistance. Each spool of our 329 wire undergoes comprehensive quality control to ensure consistent properties, precise dimensions, and superior surface quality for reliable performance in your most demanding applications.

Wire Specifications

FUSHUN METAL offers Stainless Steel 329 Wire in a comprehensive range of specifications to meet diverse application requirements:

Available Wire Diameters

• Ultra-Fine Wire: 0.10 mm to 0.30 mm
• Fine Wire: 0.31 mm to 1.00 mm
• Medium Wire: 1.01 mm to 3.00 mm
• Standard Wire: 3.01 mm to 10.00 mm

Dimensional Tolerances

Wire Diameter Range	Standard Tolerance	Precision Tolerance (Available on Request)
0.10 mm - 0.30 mm	±0.005 mm	±0.003 mm
0.31 mm - 1.00 mm	±0.010 mm	±0.005 mm
1.01 mm - 3.00 mm	±0.020 mm	±0.010 mm
3.01 mm - 10.00 mm	±0.030 mm	±0.015 mm

Surface Finishes

• Bright Drawn: Clean, smooth surface with excellent dimensional accuracy
• Annealed: Softened condition for improved formability
• Pickled and Passivated: Enhanced corrosion resistance
• Cold Worked: Various degrees of work hardening available
• Polished: Enhanced surface appearance for visible applications
• Custom Finishes: Available upon request for specific applications

Temper Conditions

• Annealed: Maximum ductility for forming operations
• Quarter Hard: Moderate strength with good formability
• Half Hard: Balanced strength and formability
• Full Hard: Maximum strength for specific applications
• Spring Temper: High strength for spring applications
• Custom Tempers: Available to meet specific mechanical property requirements

Packaging Options

• Precision Layer Wound Spools: For automated feeding and processing
• Standard Spools: Various sizes available
• Pancake Coils: For specialized applications
• Straight Cut Lengths: Available from 0.5m to 6.0m
• Custom Packaging: Designed to meet specific handling and storage requirements
• Special Protective Packaging: Available for long-term storage or harsh transit conditions

Applications

FUSHUN METAL's Stainless Steel 329 Wire is specifically engineered for applications requiring an optimal combination of high strength, corrosion resistance, and resistance to stress corrosion cracking:

Chemical Processing

• Process vessel components requiring high strength
• Heat exchanger components
• Filter wires for aggressive media
• Fasteners for chemical equipment
• Spring applications in corrosive environments
• Instrumentation components
• Valve parts requiring strength and corrosion resistance

Oil and Gas Industry

• Downhole components
• High-strength fasteners for offshore platforms
• Wire rope for marine applications
• Spring elements for subsea equipment
• Instrument line components
• Well completion equipment
• Sensor housings and components

Marine Applications

• Marine-grade fasteners and fixings
• Architectural wire mesh for coastal structures
• Cables and rigging components
• Wire mesh screens for seawater filtration
• Boat fittings and components
• Desalination plant components
• Structural reinforcement wire

Pulp and Paper Industry

• Screening wire
• Fasteners for digesters and bleach plants
• Spring applications in pulp processing
• Equipment components exposed to process chemicals
• Pressure vessel parts
• Wire mesh for filtration
• Reinforcement components

Structural Applications

• High-strength cables and tension members
• Architectural wire mesh and screens
• Concrete reinforcement wire for marine structures
• Suspension bridge components
• Structural fasteners in corrosive environments
• Tie wires for construction in aggressive atmospheres
• Support cables and components

Specialty Applications

• Springs requiring high fatigue strength in corrosive environments
• Medical device components requiring high strength
• Food processing equipment components
• High-strength wire for safety-critical applications
• Welding consumables for joining duplex materials
• Water treatment system components
• Textile industry components for harsh environments

Chemical Composition

FUSHUN METAL's Stainless Steel 329 Wire features the following nominal composition:

Element	Content (%)
Chromium (Cr)	23.0-28.0%
Nickel (Ni)	2.5-5.0%
Molybdenum (Mo)	1.0-2.0%
Manganese (Mn)	≤ 2.0%
Silicon (Si)	≤ 1.0%
Carbon (C)	≤ 0.08%
Nitrogen (N)	0.08-0.20%
Phosphorus (P)	≤ 0.035%
Sulfur (S)	≤ 0.020%
Iron (Fe)	Balance

Key Element Functions

• Chromium (23.0-28.0%): Provides excellent corrosion resistance through formation of a stable passive film. The high chromium content enhances resistance to localized corrosion, particularly pitting and crevice corrosion.
• Nickel (2.5-5.0%): Promotes the formation of austenite phase, improving ductility and toughness. The controlled nickel content helps maintain the desired balance between austenite and ferrite phases.
• Molybdenum (1.0-2.0%): Significantly enhances resistance to pitting and crevice corrosion, particularly in chloride-containing environments. Also improves resistance to reducing acids.
• Nitrogen (0.08-0.20%): Acts as an austenite stabilizer and significantly improves strength. Also enhances pitting resistance and structural stability.
• Low Carbon (≤ 0.08%): Ensures good weldability and minimizes the risk of sensitization and intergranular corrosion.

Physical and Mechanical Properties

Our Stainless Steel 329 Wire offers an impressive combination of physical and mechanical properties that make it ideal for demanding applications:

Property	Units	Value
Density	g/cm³	7.8
Melting Range	°C	1380-1430
Electrical Resistivity at 20°C	μΩ·cm	80
Thermal Conductivity at 20°C	W/m·K	15
Coefficient of Thermal Expansion (20-100°C)	10⁻⁶/K	13.0
Specific Heat at 20°C	J/kg·K	470
Young's Modulus	GPa	200
Magnetic Permeability	-	Slightly magnetic (ferrite phase)
Maximum Service Temperature	°C	300

Mechanical Properties by Condition

The mechanical properties of our 329 wire vary by temper condition to meet diverse application requirements:

Condition	Tensile Strength (MPa)*	Yield Strength (MPa)*	Elongation (%)*	Hardness*
Annealed	750-850	450-550	25-35	240-270 HB
Quarter Hard	850-950	650-750	15-25	270-300 HB
Half Hard	950-1050	750-850	10-15	300-330 HB
Full Hard	1050-1200	850-1000	5-10	330-360 HB
Spring Temper	1200-1400	1000-1200	2-5	360-400 HB

* Values are approximate and may vary depending on wire diameter and exact processing conditions

Special Features of FUSHUN METAL's 329 Wire

Our Stainless Steel 329 Wire offers several distinctive advantages that set it apart from conventional wire products:

Superior Corrosion Resistance

329 stainless steel provides exceptional corrosion resistance in challenging environments:

• Pitting Resistance: Excellent resistance to pitting corrosion in chloride-containing environments, with a Pitting Resistance Equivalent Number (PREN) typically greater than 30.
• Stress Corrosion Cracking Resistance: Superior resistance to chloride-induced stress corrosion cracking compared to austenitic stainless steels.
• Crevice Corrosion Resistance: Enhanced resistance to crevice corrosion in marine and other chloride-containing environments.
• Uniform Corrosion Resistance: Excellent general corrosion resistance in a wide range of environments including oxidizing acids.
• Seawater Resistance: Outstanding performance in marine environments, with minimal pitting even under stagnant conditions.
• Process Chemical Resistance: Good resistance to many process chemicals in pulp, paper, and chemical industries.

Exceptional Mechanical Properties

The duplex microstructure of 329 wire provides superior mechanical characteristics:

• High Yield Strength: Approximately twice the yield strength of standard austenitic stainless steels in the annealed condition.
• Excellent Fatigue Properties: Superior fatigue resistance compared to austenitic grades, making it ideal for cyclic loading applications.
• Good Ductility: Maintains good ductility despite high strength, allowing for forming operations.
• Work Hardening: Moderate work hardening rate, allowing for controlled strengthening during drawing operations.
• Abrasion Resistance: Better resistance to abrasive wear than austenitic stainless steels due to higher hardness.
• Impact Toughness: Good impact toughness, even at moderately low temperatures.

Balanced Microstructure

The carefully controlled dual-phase microstructure of 329 provides unique advantages:

• Phase Balance: Approximately equal proportions of austenite and ferrite phases for optimal combination of properties.
• Thermal Stability: Good phase stability during thermal cycling.
• Reduced Thermal Expansion: Lower coefficient of thermal expansion than austenitic grades, providing better dimensional stability during temperature changes.
• Improved Thermal Conductivity: Better thermal conductivity than austenitic grades, reducing thermal gradients and associated stresses.
• Controlled Magnetic Permeability: Moderately magnetic due to the ferrite phase, allowing for magnetic detection if required.

Manufacturing Excellence

FUSHUN METAL employs specialized processes to ensure our 329 wire delivers reliable performance in critical applications:

• Precise Composition Control: Carefully controlled alloying elements to ensure optimal phase balance and corrosion resistance.
• Advanced Melting Technology: State-of-the-art melting and refining techniques for maximum cleanliness and minimal inclusions.
• Optimized Heat Treatment: Precisely controlled solution annealing to achieve ideal microstructure and property balance.
• Specialized Drawing Processes: Proprietary drawing methods to maintain exceptional surface quality and dimensional precision.
• Microstructure Verification: Regular metallographic examination to ensure proper phase balance and microstructural integrity.
• Corrosion Testing: Comprehensive corrosion testing to validate performance in target environments.
• Mechanical Property Optimization: Carefully controlled processing to achieve desired strength and ductility combinations.

Processing Recommendations

For customers working with 329 stainless steel wire, FUSHUN METAL provides the following processing recommendations:

Forming and Bending

• Higher forming forces are required compared to austenitic grades due to higher strength.
• Minimum bend radius should be approximately 2-3 times the wire diameter for annealed condition.
• For cold-worked conditions, larger bend radii are recommended to prevent cracking.
• Tools and dies should be properly polished to prevent surface damage to the wire.
• Lubrication is recommended for complex forming operations.

Welding Guidelines

• 329 wire is weldable using standard methods with proper procedures.
• Recommended welding processes include GTAW (TIG), GMAW (MIG), and resistance welding.
• Matching composition filler metals should be used when welding to similar materials.
• Minimize heat input to prevent excessive ferrite formation in the heat-affected zone.
• No preheat or post-weld heat treatment is typically required.
• Proper shielding gas protection is essential to prevent oxidation and nitrogen loss.
• Interpass temperature should be kept below 150°C (300°F).

Heat Treatment

• Solution annealing (if required): 1020-1100°C (1870-2010°F) followed by rapid cooling.
• Stress relief is generally not recommended as temperatures that reduce residual stresses may adversely affect corrosion resistance.
• Avoid exposing 329 to temperatures between 300-900°C (570-1650°F) for extended periods to prevent embrittlement.
• Cannot be hardened by conventional heat treatment methods; hardening is achieved through cold working only.

Surface Treatment

• Pickling and passivation are recommended after any heat treatment or forming operation that could compromise the passive layer.
• Standard passivation procedures using citric or nitric acid solutions are effective.
• Electro-polishing can enhance corrosion resistance and surface appearance.
• Mechanical finishing methods such as brushing or bead blasting should be followed by proper passivation.

Quality Assurance and Testing

Every batch of FUSHUN METAL's Stainless Steel 329 Wire undergoes rigorous testing to ensure it meets our exacting quality standards:

• Chemical Composition Analysis: Spectrographic testing to verify precise element content critical for performance, with special attention to chromium, nickel, molybdenum, and nitrogen levels.
• Mechanical Property Testing: Tensile testing to confirm strength, ductility, and work hardening characteristics.
• Microstructural Examination: Metallographic analysis to verify proper phase balance, grain size, and absence of detrimental phases.
• Surface Quality Inspection: Advanced eddy current and visual inspection systems to detect surface imperfections.
• Dimensional Verification: Precision measurement throughout production to ensure tight diameter tolerances.
• Corrosion Testing: Sample testing to validate corrosion resistance in target environments.
• Inclusion Assessment: Evaluation of non-metallic inclusion content for critical applications.
• Ferrite Content Measurement: Verification of proper ferrite-austenite balance for optimal properties.

Certifications Provided

• Material Test Certificates according to EN 10204 3.1
• Chemical composition analysis
• Mechanical property test results
• Dimensional inspection report
• Ferrite content certification
• Special property verifications available upon request
• Certificate of conformity to ordered specifications
• NACE MR0175/ISO 15156 compliance certificate (when applicable)

International Standards Compliance

Our Stainless Steel 329 Wire complies with the following international standards:

Standard	Designation
UNS	S32900
ASTM	A276, A479, A580
EN/DIN	1.4460
ISO	15156/MR0175 (suitable for sour service applications)

Handling and Storage Recommendations

To maintain the quality and performance of your Stainless Steel 329 Wire, FUSHUN METAL recommends the following handling and storage practices:

• Store in a clean, dry environment away from chemical contaminants.
• Avoid contact with carbon steel items to prevent iron contamination that could compromise corrosion resistance.
• Maintain original protective packaging until ready for use.
• Handle with clean gloves to prevent surface contamination from oils or salts.
• For long-term storage, consider additional protection against moisture and airborne contaminants.
• Avoid exposure to chloride-containing environments during storage.
• Clean and passivate after any operation that might compromise the passive layer.
• Use stainless steel or plastic-coated tools when handling to prevent cross-contamination.
• Maintain separate storage and handling areas from carbon steel materials.

Comparative Advantages over Other Stainless Steel Grades

Understanding how 329 stainless steel wire compares to other grades helps in selecting the optimal material for your application:

Property	329 (Duplex)	304/304L (Austenitic)	316/316L (Austenitic)	430 (Ferritic)
Yield Strength (Annealed)	High (450-550 MPa)	Low (210-230 MPa)	Low (220-250 MPa)	Moderate (275-300 MPa)
Pitting Corrosion Resistance	Very Good	Moderate	Good	Limited
Stress Corrosion Cracking Resistance	Excellent	Poor	Moderate	Good
Chloride Resistance	Excellent	Limited	Good	Limited
Thermal Expansion	Moderate	High	High	Low
Work Hardening Rate	Moderate	High	High	Low
Magnetic Properties	Slightly Magnetic	Non-magnetic	Non-magnetic	Magnetic
Relative Cost	Moderate-High	Moderate	Moderate-High	Low-Moderate
Typical Applications	High-strength corrosion-resistant components	General-purpose corrosion resistance	Marine and chemical processing	Decorative and mild environments

Customization Capabilities

FUSHUN METAL offers extensive customization options to meet your specific application requirements:

• Custom Diameters: Special sizes manufactured to exact specifications for your application.
• Specialized Surface Finishes: Surface treatments to enhance performance characteristics or appearance.
• Custom Mechanical Properties: Tailored strength and ductility combinations through controlled cold working and annealing.
• Special Packaging: Customized packaging for protection during shipping and storage.
• Specialized Testing: Application-specific testing protocols available upon request.
• Cut-to-Length Service: Precision cutting to customer-specified lengths.
• Straightened Wire Segments: Available for applications requiring straight sections.
• Technical Consultation: Expert metallurgical support for your specific application challenges.
• Small Batch Processing: Capability to produce smaller quantities for specialized applications.
• Material Certification: Enhanced certification packages for critical applications.

Why Choose FUSHUN METAL for 329 Stainless Steel Wire

When you select FUSHUN METAL as your supplier for Stainless Steel 329 Wire, you partner with a leading manufacturer committed to excellence:

• Duplex Stainless Expertise: Specialized experience in manufacturing duplex stainless steel wire products with optimal phase balance.
• Advanced Production Facilities: State-of-the-art melting, drawing, and heat treatment equipment specifically optimized for duplex stainless steels.
• Stringent Quality Control: Comprehensive testing and inspection protocols ensure consistent performance in demanding applications.
• Metallurgical Knowledge: In-depth understanding of dual-phase microstructures and their effect on mechanical and corrosion properties.
• Supply Chain Reliability: Robust inventory management and production planning to ensure consistent availability of critical materials.
• Technical Support: Expert assistance in material selection, application guidance, and problem-solving.
• Global Capabilities: Worldwide shipping network with experience in international documentation and compliance.
• Material Traceability: Complete documentation and batch traceability for quality assurance.
• Continuous Improvement: Ongoing research and development in duplex stainless steel processing and performance.
• Industry Compliance: Materials and processes that meet or exceed international standards for critical applications.

Request Information

Contact FUSHUN METAL today to discuss your Stainless Steel 329 Wire requirements. Our technical team is ready to assist you with:

• Detailed product specifications
• Technical consultations for your specific application
• Corrosion resistance guidance for particular environments
• Custom wire development for specialized requirements
• Pricing inquiries and delivery schedules
• Sample requests for evaluation

FUSHUN METAL – Your trusted partner for premium duplex stainless steel wire solutions that deliver consistent quality, superior mechanical properties, and exceptional corrosion resistance in the most demanding service environments.

329, S32900, 1.4460, Stainless Steel Wire Images