Stainless Steel 329J1 Wire

Product Description

FUSHUN METAL's Stainless Steel 329J1 Wire is a premium Japanese-standard 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 enhanced chromium, nickel, and molybdenum content in a balanced austenite-ferrite microstructure, our 329J1 wire provides mechanical properties that significantly exceed those of conventional austenitic grades while maintaining outstanding corrosion resistance in aggressive environments. Available in precision diameters down to 0.10mm, this specialized wire combines superior strength with good ductility, making it the ideal choice for demanding applications in chemical processing, pulp and paper industries, desalination plants, marine structures, and offshore oil and gas installations. Unlike standard austenitic or ferritic grades, FUSHUN METAL's 329J1 stainless steel wire offers nearly twice the yield strength of conventional austenitic stainless steels, exceptional resistance to chloride stress corrosion cracking, and superior pitting and crevice corrosion resistance. Each spool of our 329J1 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 329J1 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

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 329J1 Wire is specifically engineered for applications requiring an optimal combination of high strength, exceptional corrosion resistance, and resistance to stress corrosion cracking:

Chemical Processing Industry

• Process vessel components in aggressive chemical environments
• Heat exchanger components and tubing supports
• Filtration wire mesh for corrosive media
• High-strength fasteners for chemical equipment
• Spring applications in corrosive chemical environments
• Pressure vessel safety wire and components
• Valve components requiring both strength and corrosion resistance

Marine and Offshore Applications

• Offshore platform structural components
• Seawater handling system components
• Marine-grade fasteners and fixings
• Wire rope and tension members for marine applications
• Subsea oil and gas equipment components
• Desalination plant components
• Marine screen mesh and filtration systems

Pulp and Paper Industry

• Digester and bleach plant components
• High-strength wire for aggressive pulping environments
• Fasteners resistant to pulp processing chemicals
• Screen wire for pulp processing
• Spring applications in corrosive paper mill conditions
• Equipment components exposed to chloride-containing process fluids
• Wire mesh for filtration in aggressive environments

Oil and Gas Industry

• Downhole components in sour wells
• High-strength components for offshore platforms
• Fasteners for petroleum processing equipment
• Flow control device components
• Well completion equipment
• Corrosion-resistant springs and wire forms
• Sensor housings for aggressive environments

Water Treatment and Desalination

• Seawater filtration components
• High-pressure pump components
• Reverse osmosis system components
• Fasteners for water treatment equipment
• Screen wire for intake systems
• Valve components for chlorinated water
• Structural supports for treatment facilities

Specialty Applications

• High-performance springs for corrosive environments
• Architectural wire mesh for coastal structures
• Safety-critical components requiring both strength and corrosion resistance
• Food processing equipment for high-chloride environments
• Welding consumables for joining duplex materials
• Reinforcement wire for concrete in marine environments
• Medical device components requiring high strength and corrosion resistance

Chemical Composition

FUSHUN METAL's Stainless Steel 329J1 Wire features the following nominal composition per JIS G4304/G4305 standards:

Key Element Functions

• Chromium (24.0-26.0%): Provides exceptional corrosion resistance through formation of a stable passive film. The high chromium content significantly enhances resistance to localized corrosion, particularly pitting and crevice corrosion in chloride environments.
• Nickel (4.0-6.0%): Promotes austenite formation and stability, improving toughness and ductility while maintaining the balanced duplex microstructure. Enhances resistance to stress corrosion cracking.
• Molybdenum (1.5-2.5%): Significantly enhances resistance to pitting and crevice corrosion, particularly in chloride-containing environments. Also improves resistance to reducing acids and high-temperature performance.
• Nitrogen (0.10-0.22%): Acts as an austenite stabilizer and significantly improves strength. Also enhances pitting resistance (working synergistically with chromium and molybdenum) and structural stability.
• Low Carbon (≤ 0.08%): Ensures good weldability and minimizes the risk of sensitization and intergranular corrosion in heat-affected zones.

Corrosion Resistance Indicators

329J1 features excellent corrosion resistance properties as indicated by the following metrics:

• PREN (Pitting Resistance Equivalent Number): Typically 32-36 (calculated as %Cr + 3.3*%Mo + 16*%N)
• Critical Pitting Temperature (CPT): Approximately 35-40°C in 6% FeCl₃ solution (ASTM G48)
• Critical Crevice Temperature (CCT): Approximately 22-28°C in 6% FeCl₃ solution (ASTM G48)

Physical and Mechanical Properties

Our Stainless Steel 329J1 Wire offers an impressive combination of physical and mechanical properties that make it ideal for demanding applications:

Mechanical Properties by Condition

The mechanical properties of our 329J1 wire vary by temper condition to meet diverse application requirements:

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

Special Features of FUSHUN METAL's 329J1 Wire

Our Stainless Steel 329J1 Wire offers several distinctive advantages that set it apart from conventional wire products:

Exceptional Corrosion Resistance

329J1 stainless steel provides outstanding corrosion resistance in challenging environments:

• Superior Pitting Resistance: Excellent resistance to pitting corrosion in chloride-containing environments, with a high PREN value (32-36).
• Exceptional Stress Corrosion Cracking Resistance: Far superior resistance to chloride-induced SCC compared to austenitic grades such as 304 and 316.
• Enhanced Crevice Corrosion Resistance: Excellent performance in tight crevices even in aggressive marine and chloride environments.
• Seawater Performance: Outstanding resistance to corrosion in seawater, even under stagnant conditions.
• Pulp and Paper Chemicals: Excellent resistance to the corrosive chemicals found in pulp and paper processing.
• Uniform Corrosion Resistance: Good general corrosion resistance across a wide range of acids and alkalis.
• Erosion-Corrosion Resistance: Excellent resistance to combined erosion and corrosion due to higher hardness and corrosion resistance.

Superior Mechanical Properties

The duplex microstructure of 329J1 wire provides exceptional 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.
• Enhanced Work Hardening: Good work hardening capability while maintaining ductility.
• Impact Toughness: Good impact toughness maintained even at moderately low temperatures.
• Superior Wear Resistance: Better resistance to abrasive and adhesive wear compared to austenitic stainless steels.
• Stress Relaxation Resistance: Better resistance to stress relaxation at elevated temperatures compared to austenitic grades.
• Thermal Stability: Good mechanical property retention during thermal cycling.

Optimized Duplex Microstructure

The carefully controlled dual-phase microstructure of 329J1 provides unique advantages:

• Balanced Phase Structure: Approximately 45-55% ferrite and 55-45% austenite for optimal property combination.
• Phase Stability: Good microstructural 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 Response: Moderately magnetic due to the ferrite phase, allowing for magnetic detection when required.
• Stress Resistance: The dual-phase structure provides excellent resistance to both stress corrosion cracking and hydrogen embrittlement.

Manufacturing Excellence

FUSHUN METAL employs specialized processes to ensure our 329J1 wire delivers reliable performance in critical applications:

• Precise Composition Control: Carefully controlled alloying elements to ensure optimal phase balance and corrosion resistance.
• Optimized Solution Annealing: Precise thermal processing to achieve ideal microstructure and property balance.
• Enhanced Clean Steel Practices: Advanced melting and refining techniques for maximum cleanliness and minimal inclusions.
• Specialized Drawing Processes: Proprietary drawing methods to maintain exceptional surface quality and dimensional precision.
• Strict Microstructure Verification: Regular metallographic examination to ensure proper phase balance and microstructural integrity.
• Comprehensive Corrosion Testing: Advanced testing protocols to validate performance in target environments.
• Expert Heat Treatment: Specialized thermal processing to optimize mechanical and corrosion properties.

Processing Recommendations

For customers working with 329J1 stainless steel wire, FUSHUN METAL provides the following processing recommendations:

Forming and Bending

• Higher forming forces are required compared to austenitic grades due to the higher strength of duplex stainless steel.
• 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 and harder than those used for austenitic grades.
• Lubrication is recommended for complex forming operations.
• Due to higher springback compared to austenitic grades, overbending may be necessary.

Welding Guidelines

• 329J1 wire is weldable using standard methods with proper procedures.
• Recommended welding processes include GTAW (TIG), GMAW (MIG), and resistance welding.
• Matching composition filler metals or filler metals specifically designed for duplex stainless steels should be used.
• Control heat input to 0.5-2.5 kJ/mm range to maintain proper phase balance.
• No preheat is required, and interpass temperature should be kept below 150°C (300°F).
• Use shielding gases with nitrogen additions (2-5% N₂ in Ar) for GTAW to prevent nitrogen loss from the weld metal.
• Post-weld annealing is typically not required for thin sections but may be considered for critical applications.

Heat Treatment

• Solution annealing (if required): 1040-1080°C (1900-1975°F) followed by rapid cooling (water quench preferred).
• Stress relief treatments are generally not recommended as temperatures that reduce residual stresses may adversely affect corrosion resistance.
• Avoid exposing 329J1 to temperatures between 300-900°C (570-1650°F) for extended periods to prevent precipitation of detrimental phases.
• Cannot be hardened by conventional heat treatment methods; hardening is achieved through cold working only.

Surface Treatment

• Pickling and passivation are highly recommended after any heat treatment or forming operation that could compromise the passive layer.
• Recommended passivation procedure: 20-25% nitric acid solution at 49-60°C (120-140°F) for 30 minutes.
• Alternative passivation using citric acid-based solutions (10-15%) is environmentally friendly and effective.
• Electro-polishing can significantly enhance corrosion resistance and surface appearance.
• Mechanical finishing methods such as brushing or bead blasting should be followed by proper passivation.
• For maximum corrosion resistance, remove all heat tint and oxide from welded or heat-affected areas.

Quality Assurance and Testing

Every batch of FUSHUN METAL's Stainless Steel 329J1 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 may include ASTM G48 pitting resistance tests and other environment-specific corrosion evaluation.
• Ferrite Content Measurement: Verification of proper ferrite-austenite balance for optimal properties.
• Inclusion Assessment: Evaluation of non-metallic inclusion content for critical applications.

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)
• JIS G4304/G4305 compliance certification

International Standards Compliance

Our Stainless Steel 329J1 Wire complies with the following international standards:

Handling and Storage Recommendations

To maintain the quality and performance of your Stainless Steel 329J1 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 unless properly protected.
• 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.
• For wire intended for critical corrosion environments, consider additional cleaning and passivation before use.

Comparative Advantages over Other Stainless Steel Grades

Understanding how 329J1 stainless steel wire compares to other grades helps in selecting the optimal material for your application:

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.
• Enhanced Corrosion Testing: Specific corrosion tests tailored to your service environment.
• 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 329J1 Stainless Steel Wire

When you select FUSHUN METAL as your supplier for Stainless Steel 329J1 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.
• JIS Standard Compliance: Deep understanding of Japanese Industrial Standards specifications and the unique properties of 329J1 grade.
• 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 329J1 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 Japanese-standard duplex stainless steel wire solutions that deliver consistent quality, superior mechanical properties, and exceptional corrosion resistance in the most demanding service environments.

For over 20 years, Fushun Steel, have been dedicated to manufacturing high-quality spring steel wire. Our stable quality and superior technique are the foundations of our success, and we pride ourselves on delivering products that meet or exceed our customers' expectations. With a focus on innovation and efficiency, we utilize the latest technologies to ensure consistent quality and timely delivery.

We have more than 400 employees and our plant covers an area of nearly 15,000 square meters, with an annual output of 100,000 tons. Our advanced equipment allows us to produce high-quality spring steel products efficiently, meeting the needs of our customers.

In the production of spring steel wire, a variety of specialized equipment is essential. Shot Peening Machine. Wire Drawing Machine. Phosphating Equipment. Annealing Furnace. Polishing Equipment. Wire Coiling Machine. End Grinding Machine. Tensile and Compression Testing Machine.

Our commitment to excellence and reliability has resulted in long-standing partnerships with some of the biggest names in the industry. Like MW Industries, NHK Spring, Scherdel, Sogefi, Mubea etc. We also have established partnerships with several prominent Chinese steel groups, like Baowusteel, Xinyusteel, Nanjinsteel, Shagang etc.

Our spring steel wire comes in various categories such as music wire, hard drawn wire, oil tempered wire, chrome silicon wire, chrome vanadium wire, stainless steel wire, nickel plated wire, phosphate coated wire, galvanized wire, and copper coated wire.

Spring steel wire is a versatile material that is utilized in the manufacture of a wide array of products. including automotive suspension springs, valve springs, and torsion springs. Beyond springs, paper clips and mattress supports. In addition, spring steel wire is essential in the creation of retaining rings and circlips that are utilized to secure components on shafts or within bores, and in making various types of fasteners. The durability and resilience of spring steel wire also make it a key material in the manufacturing of certain types of cable, fencing, and even some musical instruments, such as piano and guitar strings, where its ability to return to its original shape after deformation is highly valued.