AISI 329 Duplex Stainless Steel
Review
Description
AISI 329 Duplex Stainless Steel
Premium Austenitic-Ferritic Steel from FUSHUN METAL
Steel Grade Introduction and Applications
AISI 329 (also known as 1.4460, X3CrNiMoN27-5-2, SS 2324, PRODEC®) is a premium duplex stainless steel supplied by FUSHUN METAL. This high-performance austenitic-ferritic stainless steel is characterized by excellent resistance to pitting corrosion, crevice corrosion, stress corrosion, and corrosion fatigue. The steel combines high strength with excellent machinability and superior toughness properties, making it ideal for demanding marine and industrial applications.
FUSHUN METAL ensures consistent quality and reliable supply of this specialized AISI 329 duplex stainless steel, meeting stringent requirements for marine applications, chemical processing, and high-performance engineering components. The two-phase microstructure and low carbon content provide superior resistance to intergranular corrosion after sensitization, with corrosion resistance much better than fully austenitic stainless steels of T316 type.
Key Characteristics:
Superior to T316 type in chloride-bearing environments
Enhanced mechanical properties with duplex structure
Easy machining characteristics for complex components
Superior impact resistance and durability
Primary Applications:
Propeller shafts and marine hardware components
Pump shafts, impellers, and parts
Valve components and trim parts
Spindles, stirrers, and pistons
Bolts, nuts, and fastening systems
Equipment in corrosive environments
Chemical Composition, Mechanical Properties & Heat Treatment
Chemical Composition (Typical Analysis)
| Element | C | Cr | Ni | Mo |
|---|---|---|---|---|
| Content (%) | 0.025 | 25.4 | 5.75 | 1.5 |
Mechanical Properties (Solution Annealed Condition)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (Rm) | 620-880 | N/mm² |
| Proof Strength (Rp0.2) | Min. 460 | N/mm² |
| Elongation (A5) | Min. 20 | % |
| Impact Energy (KV-RT) | Min. 85 | J/cm² |
| Hardness (HB) | Max. 260 | HB |
Physical Properties
| Property | 20°C | 200°C | 300°C |
|---|---|---|---|
| Density | 7.8 kg/dm³ | ||
| Modulus of Elasticity (kN/mm²) | 200 | 194 | 186 |
| Thermal Expansion (10⁻⁶ K⁻¹) | - | 13.0 | 13.5 |
| Thermal Conductivity | 15 W/m°C | ||
| Electrical Resistivity | 0.8 Ωmm²/m | ||
| Specific Heat | 500 J/kg°C | ||
Heat Treatment
| Treatment | Temperature | Holding Time | Cooling |
|---|---|---|---|
| Solution Annealing | 950-1000°C | Approx. 30 min | Water quenching |
Delivery Condition: AISI 329 is supplied by FUSHUN METAL in solution annealed condition for optimal corrosion resistance and mechanical properties.
Important Note: The steel is susceptible to embrittlement when applied in the temperature range of 300-900°C.
Service Temperature: Scaling temperature in air is approximately 1070°C.
Corrosion Resistance & Welding Properties
Corrosion Resistance
AISI 329 shows very good corrosion resistance particularly in chloride-bearing environments. Its resistance to chloride-caused attacks such as pitting, crevice corrosion, stress corrosion, and corrosion fatigue is much better than that of fully austenitic stainless steels of T316 type.
In most cases, AISI 329 is much better than T316 type with regard to general corrosion resistance in reducing and oxidizing acids. The two-phase microstructure and low carbon content render AISI 329 better resistance to intergranular corrosion after sensitization within the temperature interval 500-900°C.
Recommendation: When extremely high demands are imposed on resistance to pitting and crevice corrosion, it is recommended that machining of the steel surface be followed by pickling or passivation.
Welding Properties
AISI 329 possesses good weldability and can be welded in the same manner as austenitic material. Welding should be carried out without preheating and with small weld beads, with as little heat supply as possible.
It is not necessary to use welding consumables of the same steel grade, as austenitic ones can also be used effectively.
Note: Welding of AISI 329 and subsequent application in highly corrosive environments could lead to a reduction in corrosion resistance. After annealing at 980°C and quenching in water, the corrosion resistance of the weld will be just as high as that of the base material.
Available Sizes from FUSHUN METAL
FUSHUN METAL maintains comprehensive inventory of AISI 329 duplex stainless steel in various sizes to meet diverse industrial requirements. Our standard sizes are readily available from stock for immediate delivery.
Standard Stock Sizes Available:
Round Bars: Diameter 12mm to 350mm, Length up to 6000mm
Flat Bars: Thickness 6mm to 200mm, Width up to 600mm
Square Bars: 12mm × 12mm to 250mm × 250mm
Plates: Thickness 8mm to 150mm, Custom dimensions available
Marine Shafts: Precision machined shafts for marine applications
Bar Finish: Machined or ground surface finish available
Stock Advantage: Standard sizes are maintained in inventory for fast delivery and competitive pricing, ensuring minimal lead times for marine, pump, and valve manufacturing projects.
Custom Manufacturing: We accept custom orders for non-standard dimensions and special requirements. Please contact us to discuss your specific size requirements and production capabilities.
Quote Request: Contact FUSHUN METAL today for competitive pricing on standard sizes or custom manufacturing solutions for your AISI 329 applications.
FUSHUN METAL Advantages
Fast Stock Delivery
Extensive inventory of AISI 329 ensures rapid delivery of standard sizes, minimizing your project downtime and maintaining production schedules for marine applications, pump manufacturing, and valve production.
Integrated Manufacturing Network
Strategic partnerships with leading Chinese specialty stainless steel producers ensure consistent quality, competitive pricing, and reliable supply chain management for premium duplex stainless steels like AISI 329.
Precision Machining Services
Complete machining capabilities including turning, grinding, and precision finishing services to deliver ready-to-use components for marine, pump, and valve applications, saving time and costs for downstream customers.
Technical Expertise
Professional technical support and consultation services to help customers optimize material selection, heat treatment, welding procedures, and application-specific solutions for AISI 329 in demanding marine and corrosive environments.
Contact FUSHUN METAL Today
Experience the FUSHUN METAL advantage in premium duplex stainless steel supply. Contact us for competitive quotes, technical consultation, and reliable delivery solutions for your AISI 329 requirements in marine, pump, valve, and chemical processing applications.
