Stainless Steel 329J3L Wire

Product Description

FUSHUN METAL's Stainless Steel 329J3L Wire is a premium Japanese-standard super duplex stainless steel wire offering an outstanding combination of extremely high strength, exceptional corrosion resistance, and superior resistance to stress corrosion cracking. With an advanced chemical composition featuring enhanced chromium, nickel, molybdenum, and controlled nitrogen content in a precisely balanced austenite-ferrite microstructure, our 329J3L wire provides mechanical properties and corrosion performance that significantly outperform conventional duplex and austenitic stainless steels. Available in precision diameters down to 0.10mm, this specialized wire combines remarkable strength with good ductility, making it the ideal choice for the most demanding applications in offshore oil and gas, seawater handling systems, chemical processing equipment, desalination plants, and high-pressure components in aggressive environments. Unlike standard duplex or super austenitic grades, FUSHUN METAL's 329J3L stainless steel wire offers over twice the yield strength of conventional austenitic grades, exceptional resistance to pitting and crevice corrosion (PREN >40), and outstanding performance in chloride-containing environments. Each spool of our 329J3L wire undergoes comprehensive quality control to ensure consistent properties, precise dimensions, and superior surface quality for reliable performance in the most aggressive service conditions.

Wire Specifications

FUSHUN METAL offers Stainless Steel 329J3L 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 329J3L Wire is specifically engineered for applications requiring an optimal combination of extreme strength, exceptional corrosion resistance, and resistance to stress corrosion cracking in highly aggressive environments:

Offshore Oil and Gas

• Subsea umbilical components
• Downhole components in highly corrosive wells
• High-strength fasteners for critical offshore structures
• Topside and subsea instrumentation lines
• Highly stressed components in seawater environments
• Flow control equipment for aggressive production fluids
• Safety-critical tension members and fasteners

Chemical Processing Industry

• Process vessel components in highly aggressive chemical environments
• High-pressure heat exchanger components
• Filtration systems for aggressive acids and process chemicals
• Critical fasteners for chemical equipment
• Spring applications in severe corrosive environments
• Pressure vessel safety components
• Pump and valve components for aggressive media

Seawater Systems

• Desalination plant high-pressure components
• Reverse osmosis system components
• Seawater handling systems
• Marine heat exchangers
• Pumping systems for seawater
• Filtration equipment for marine applications
• Offshore platform seawater systems

Pulp and Paper Industry

• Digesters and bleach plant components exposed to chloride-containing media
• High-strength wire for aggressive pulping environments
• Components exposed to hot concentrated chloride solutions
• High-pressure pulp processing equipment
• Spring applications in bleaching chemicals
• Critical fasteners for pulp and paper equipment
• Recovery boiler components

High-Pressure Applications

• High-pressure fasteners and bolting
• Tension members for severe service
• Pressure vessel components
• Safety-critical springs and fasteners
• High-stress mechanical components
• Downhole oil tool components
• Critical structural elements in aggressive environments

Specialty Applications

• Ultra-high performance springs for severe environments
• Critical marine structural components
• Safety-critical components requiring maximum corrosion resistance
• High-pressure flue gas desulfurization systems
• Mining equipment components for aggressive conditions
• Geothermal well components
• Reinforcement elements for concrete in extremely aggressive environments

Chemical Composition

FUSHUN METAL's Stainless Steel 329J3L 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. This high chromium content significantly enhances resistance to localized corrosion, particularly pitting and crevice corrosion in aggressive chloride environments.
• Nickel (6.0-8.0%): Promotes austenite formation and stability, balancing the microstructure and improving toughness, ductility, and overall corrosion resistance, particularly in reducing environments.
• Molybdenum (3.0-4.5%): Dramatically enhances resistance to pitting and crevice corrosion, particularly in chloride-containing environments. This higher molybdenum content compared to standard duplex grades is a key factor in the superior corrosion performance of 329J3L.
• Nitrogen (0.24-0.32%): Acts as a powerful austenite stabilizer and significantly improves strength. Also enhances pitting resistance (working synergistically with chromium and molybdenum) and structural stability. The high nitrogen content is essential for achieving the "super duplex" classification.
• Low Carbon (≤ 0.030%): Ensures excellent weldability and minimizes the risk of sensitization and intergranular corrosion in heat-affected zones.
• Optional Tungsten (≤ 1.0%): When present, enhances pitting resistance and can improve crevice corrosion resistance.

Corrosion Resistance Indicators

329J3L features exceptional corrosion resistance properties as indicated by the following metrics:

• PREN (Pitting Resistance Equivalent Number): 40-43 (calculated as %Cr + 3.3*%Mo + 16*%N)
• Critical Pitting Temperature (CPT): Approximately 50-55°C in 6% FeCl₃ solution (ASTM G48)
• Critical Crevice Temperature (CCT): Approximately 30-35°C in 6% FeCl₃ solution (ASTM G48)
• Chloride SCC Resistance: Excellent up to approximately 250°C in concentrated chloride solutions

Physical and Mechanical Properties

Our Stainless Steel 329J3L 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 329J3L 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 329J3L Wire

Our Stainless Steel 329J3L Wire offers several distinctive advantages that set it apart from conventional wire products:

Exceptional Corrosion Resistance

329J3L super duplex stainless steel provides outstanding corrosion resistance in the most aggressive environments:

• Superior Pitting Resistance: Exceptional resistance to pitting corrosion in severe chloride-containing environments, with a PREN value of 40-43.
• Exceptional Crevice Corrosion Resistance: Outstanding performance in tight crevices even in hot seawater and concentrated chloride solutions.
• Superior Stress Corrosion Cracking Resistance: Excellent resistance to chloride-induced SCC at temperatures up to approximately 250°C.
• Seawater Performance: Outstanding resistance to corrosion in seawater at elevated temperatures, even under stagnant conditions.
• Acid Resistance: Excellent resistance to a wide range of organic and inorganic acids, including mixed acids and contaminated solutions.
• Erosion-Corrosion Resistance: Exceptional resistance to combined erosion and corrosion due to higher hardness and superior corrosion resistance.
• Reducing Acid Performance: Good resistance to reducing acids due to the higher nickel content compared to standard duplex grades.

Extraordinary Mechanical Properties

The super duplex microstructure of 329J3L wire provides exceptional mechanical characteristics:

• Superior Yield Strength: Approximately 2.5 times the yield strength of standard austenitic stainless steels in the annealed condition.
• Excellent Fatigue Resistance: Superior fatigue life under cyclic loading conditions, especially in corrosive environments.
• High Tensile Strength: Outstanding tensile properties allow for reduced cross-sections in design, saving weight and material.
• Good Ductility: Despite high strength, maintains reasonable ductility for forming operations.
• Superior Wear Resistance: Better resistance to abrasive and adhesive wear compared to austenitic stainless steels.
• Excellent Impact Toughness: Good impact properties maintained even at moderately low temperatures.
• Low Cycle Fatigue Resistance: Excellent performance under conditions of alternating plastic strain.

Optimized Duplex Microstructure

The carefully controlled dual-phase microstructure of 329J3L provides unique advantages:

• Balanced Phase Structure: Typically 45-55% ferrite and 55-45% austenite for optimal property combination.
• Enhanced Phase Stability: The higher alloying content improves phase stability during thermal cycling and welding.
• Superior Thermal Stability: Better resistance to intermetallic phase formation during high-temperature exposure.
• 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.
• Hydrogen Embrittlement Resistance: Better resistance to hydrogen damage than high-strength martensitic and precipitation hardening stainless steels.

Manufacturing Excellence

FUSHUN METAL employs specialized processes to ensure our 329J3L wire delivers reliable performance in critical applications:

• Precise Composition Control: Advanced melting and refining techniques to achieve the exact balance of alloying elements required for optimal properties.
• Precise Microstructure Control: Specialized thermal-mechanical processing to achieve the ideal austenite-ferrite balance and grain structure.
• Enhanced Clean Steel Practices: Ultra-clean melting practices to minimize inclusions and impurities, enhancing corrosion resistance and mechanical properties.
• Specialized Drawing Processes: Proprietary drawing methods tailored specifically for super duplex grades to maintain exceptional surface quality and dimensional precision.
• Rigorous Microstructure Verification: Comprehensive metallographic examination to ensure proper phase balance and absence of detrimental intermetallic phases.
• Advanced Corrosion Testing: Sophisticated testing protocols including critical pitting temperature and critical crevice corrosion temperature testing.
• Expert Heat Treatment: Precisely controlled solution annealing treatments to optimize mechanical and corrosion properties.

Processing Recommendations

For customers working with 329J3L super duplex stainless steel wire, FUSHUN METAL provides the following processing recommendations:

Forming and Bending

• Higher forming forces are required compared to austenitic and standard duplex grades due to the significantly higher strength of super duplex stainless steel.
• Minimum bend radius should be approximately 3-4 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 significantly harder than those used for austenitic grades.
• Lubrication is essential for all forming operations to prevent galling and surface damage.
• Due to higher springback compared to other stainless steel grades, increased overbending may be necessary.
• Consider intermediate annealing for complex multi-stage forming operations.

Welding Guidelines

• 329J3L wire can be welded using standard methods with proper procedures, though more care is required compared to standard duplex grades.
• Recommended welding processes include GTAW (TIG), GMAW (MIG), and resistance welding.
• Matching composition filler metals or filler metals specifically designed for super duplex stainless steels should be used.
• Carefully control heat input to 0.5-2.0 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.
• Root protection with 100% Ar or Ar-N₂ mixtures is essential to prevent oxygen contamination.
• Post-weld solution annealing may be considered for critical applications, though it may be difficult for complex assemblies.

Heat Treatment

• Solution annealing (if required): 1040-1120°C (1900-2050°F) followed by rapid cooling (water quench preferred).
• Quenching is critical - water quenching is strongly recommended for sections over 3mm to avoid detrimental phase formation.
• Stress relief treatments are generally not recommended as temperatures that reduce residual stresses may lead to intermetallic precipitation.
• Avoid exposing 329J3L to temperatures between 300-1000°C (570-1830°F) for extended periods to prevent embrittlement due to intermetallic phase formation.
• Cannot be hardened by conventional heat treatment methods; hardening is achieved through cold working only.

Surface Treatment

• Pickling and passivation are essential 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.
• For maximum corrosion resistance, remove all heat tint and oxide from welded or heat-affected areas.
• Thorough cleaning before and after any fabrication process is critical for maintaining corrosion performance.

Quality Assurance and Testing

Every batch of FUSHUN METAL's Stainless Steel 329J3L Wire undergoes rigorous testing to ensure it meets our exacting quality standards:

• Chemical Composition Analysis: Advanced spectrographic testing to verify precise element content critical for performance, with special attention to chromium, nickel, molybdenum, and nitrogen levels.
• Mechanical Property Testing: Comprehensive tensile testing to confirm strength, ductility, and work hardening characteristics.
• Microstructural Examination: Detailed metallographic analysis to verify proper phase balance, grain size, and absence of detrimental intermetallic 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 including ASTM G48 pitting resistance tests to validate PREN performance.
• Ferrite Content Measurement: Verified using both magnetic and metallographic methods to ensure proper ferrite-austenite balance.
• Inclusion Assessment: Detailed evaluation of non-metallic inclusion content for critical applications.
• Critical Pitting Temperature Testing: Available for critical applications to verify actual CPT performance.
• Intergranular Corrosion Testing: Testing to confirm resistance to sensitization and intergranular attack.

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
• PREN calculation certificate

International Standards Compliance

Our Stainless Steel 329J3L Wire complies with the following international standards:

Handling and Storage Recommendations

To maintain the quality and performance of your Stainless Steel 329J3L 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 only 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.
• Proper lifting and handling to avoid mechanical damage to the wire surface.

Comparative Advantages over Other Stainless Steel Grades

Understanding how 329J3L super duplex 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.
• Custom Alloy Modifications: Minor composition adjustments for specific property enhancements.

Why Choose FUSHUN METAL for 329J3L Stainless Steel Wire

When you select FUSHUN METAL as your supplier for Stainless Steel 329J3L Wire, you partner with a leading manufacturer committed to excellence:

• Super Duplex Expertise: Specialized experience in manufacturing super duplex stainless steel wire products with optimal phase balance and corrosion properties.
• JIS Standard Compliance: Deep understanding of Japanese Industrial Standards specifications and the unique properties of 329J3L grade.
• Advanced Production Facilities: State-of-the-art melting, drawing, and heat treatment equipment specifically optimized for super duplex stainless steels.
• Stringent Quality Control: Comprehensive testing and inspection protocols ensure consistent performance in the most demanding applications.
• Metallurgical Knowledge: In-depth understanding of super duplex 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 super duplex stainless steel processing and performance.
• Industry Compliance: Materials and processes that meet or exceed international standards for critical applications.
• Critical Application Experience: Track record of supplying super duplex materials for the most demanding applications worldwide.

Request Information

Contact FUSHUN METAL today to discuss your Stainless Steel 329J3L 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 super duplex stainless steel wire solutions that deliver consistent quality, superior mechanical properties, and exceptional corrosion resistance in the most aggressive 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.