Duplex 2205 / ASTM A182 F51 / S31803 / S32205Forging Metallurgy & Specs
22% Cr Dual-Phase Stainless Steel with PREN ≥ 35 for Sour Gas & Marine Lines. Hot-forged and precision-machined in Rajkot, Gujarat strictly up to 50 kg max piece weight with 100% Optical Emission Spectrometry (OES) PMI testing and EN 10204 3.1 MTC compliance.
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Duplex 2205 / ASTM A182 F51 / S31803 / S32205 (UNS S31803 / UNS S32205 / 1.4462 / X2CrNiMoN22-5-3) offers a minimum tensile strength of 655 – 880 MPa (95 – 128 ksi) and yield strength of 450 MPa min (65 ksi) with 290 HBW max (≤28 HRC per NACE MR0175) hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features PREN ≥ 35; virtually immune to chloride stress corrosion cracking up to 150°C. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
Duplex 2205 / ASTM A182 F51 / S31803 / S32205 Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Chromium | Cr | 22.00% | 23.00% | Forms passive chromium oxide layer for oxidation & corrosion resistance |
| Nickel | Ni | 4.50% | 6.50% | Improves notch toughness, cryogenic ductility & hardenability |
| Molybdenum | Mo | 3.00% | 3.50% | Prevents chloride pitting and enhances high-temperature creep strength |
| Nitrogen | N | 0.14% | 0.20% | Austenite stabilizer; increases yield strength and PREN pitting number |
| Carbon | C | — | 0.03% | Controls base tensile strength & core hardness |
| Manganese | Mn | — | 2.00% | Combines with sulfur, increases hardenability and hot workability |
| Silicon | Si | — | 1.00% | Deoxidizer during melting; improves high-temperature scaling resistance |
* Ladle chemical analysis verified using optical emission spectrometer (OES) calibrated to NIST certified reference materials. Full chemical results recorded on EN 10204 3.1 MTC.
Duplex 2205 / ASTM A182 F51 / S31803 / S32205 Mechanical Properties
Ultimate breaking stress threshold
Elastic deformation limit
Plastic ductility before rupture
Surface indentation resistance
Cross-sectional necking ductile ratio
Dynamic fracture energy absorption
Thermal Cycle & Machining Parameters
1180°C – 950°C (requires rapid working to prevent sigma phase embrittlement)
Solution annealed at 1040°C – 1080°C followed by forced water quenching to preserve 45-55% ferrite balance
PREN ≥ 35; virtually immune to chloride stress corrosion cracking up to 150°C
Machinability: 35% of AISI 1212 • Excellent using 2209 duplex filler with controlled heat input (0.5 – 2.0 kJ/mm) to prevent excessive ferrite in HAZ
International Equivalent Material Grades
Forged Components Manufactured in Duplex 2205
Duplex 2205 Frequently Asked Technical Questions
Duplex 2205 achieves a certified PREN of 35 to 38 [calculated as %Cr + 3.3(%Mo) + 16(%N)], offering more than double the pitting resistance of standard SS 316L (PREN ~24).
Every batch undergoes ASTM E562 automated metallurgical phase count verification at our Rajkot quality lab, confirming 40% to 60% ferrite balance with zero detrimental intermetallic phases (sigma, chi) per ASTM A923 Method C.
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