Key Feature

The High-Strength Duplex Corrosion-Resistant Bar Stock. Dual-phase microstructure provides approximately double the yield strength of 316L with superior chloride stress corrosion cracking resistance.

The workhorse duplex grade offering optimal balance of strength, corrosion resistance, and cost-effectiveness in bar form.

Common Designations

UNS S31803/S32205
ASTM A276 (Stainless Steel Bars)
ASTM A479 (Bars for Pressure Vessels)
EN 1.4462, X2CrNiMoN22-5-3
SAF 2205™
JIS SUS329J3L

S32205 is the leaner, more common variant; S31803 has slightly different chemistry limits.

Chemical Composition (Typical wt.%)

C: ≤ 0.030
Cr: 22.0 - 23.0Ni: 4.5 - 6.5
Mo: 3.0 - 3.5N: 0.14 - 0.20Mn: ≤ 2.00
Si: ≤ 1.00

Nitrogen addition is critical for austenite formation and strength enhancement.

Mechanical Properties

Tensile Strength: ≥ 620 MPa
Yield Strength: ≥ 450 MPa
Elongation: ≥ 25%
Hardness: ≤ 293 HB
Impact Toughness: ≥ 100 J at -40°C

Approximately double the yield strength of 316L, allowing for component size/weight reduction.

Physical Properties

Density: 7.80 g/cm³
Melting Range: 1400 - 1450 °C
Thermal Expansion: 13.7 × 10⁻⁶/K (20-100°C)
Thermal Conductivity: 19 W/m·K (100°C)
Magnetic (due to ferrite phase)

Lower thermal expansion than austenitics reduces thermal stress in components.

Available Forms

Rounds: 6mm - 300mm diameter
Squares: 6mm - 150mm
Hexagons: 6mm - 100mm
Flats: Various sizes
Billets: For forging applications
Forgings: Custom forged components

Full range of bar stock forms for machining and fabrication.

Surface Conditions

Hot Rolled: As-rolled surface
Cold Drawn: Bright finish
Centerless Ground: Precision ground
Polished: For specific applications
Peeled: Improved surface for machining

Various surface finishes available for different requirements.

Corrosion Resistance

Exceptional: PREN*: 34-36
Excellent resistance to: chloride stress corrosion cracking, pitting, crevice corrosion, erosion-corrosion.

Superior to 316L in chloride-containing environments; comparable to some 6% Mo austenitics.

Machining Characteristics

• More challenging than austenitic grades
• Higher tool wear due to strength
• Requires rigid setups• Good chip control• Surface finish achievable with proper techniques

Requires more powerful equipment and specialized tooling compared to austenitic grades.

Welding Characteristics

Requires controlled procedures
Maintain phase balance critical
Overmatched filler metals (higher alloy)
Heat input control essential
No preheat required

More demanding than austenitic welding but well-established procedures exist.

Key Standards

ASTM A276 2205: Stainless Steel Bars
ASTM A479 2205: Bars for Pressure Vessels
ASTM A484: General Requirements
EN 10088-3: Stainless Steel Bars
NORSOK M-630: Offshore materials
ASME SA479: Code Construction

Industry-recognized standards for quality assurance.

Common Applications

• Oil & Gas Components: Wellhead parts, valve bodies, pump shafts, fasteners
• Chemical Processing: Reactor parts, agitator shafts, valve stems, heat exchanger parts
• Marine Hardware: Propeller shafts, marine fasteners, offshore platform components
• Pulp & Paper: Digester components, bleach plant equipment, agitator shafts
• Desalination Plants: High-pressure pump shafts, valve components, fasteners
• Power Generation: Turbine components, pump shafts, high-strength fasteners
• Architectural: High-strength coastal construction components, bridges, marine structures

Specifically selected for aggressive chloride-containing environments requiring high strength.