UNS S32205 vs. S31803: Chemical Composition
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What is UNS S32205 material pipe?
UNS S32205 is a high-performance duplex (ferritic-austenitic) stainless steel pipe, often called Alloy 2205 or SAF 2205, engineered for superior corrosion resistance and high strength, featuring roughly double the yield strength of standard austenitic steels. Known as EN 1.4462, it is widely used in oil & gas, chemical processing, and marine applications.
What is S31803 material equivalent to?
S31803 material is primarily equivalent to Alloy 2205 (a 22% chromium duplex stainless steel) and is commonly designated as DIN 1.4462 or ASTM A182 F51. It is widely used for superior corrosion resistance and high strength, with frequent applications in oil/gas, chemical, and marine sectors. The alloy acts as a stronger, more corrosion-resistant alternative to 316 stainless steel.
What is the difference between S31803 and S32205?
UNS S32205 is an upgraded, higher-performance version of S31803 duplex stainless steel, featuring tighter specifications for improved corrosion resistance and strength. S32205 has higher minimum Chromium, Molybdenum, and Nitrogen content (34-38 PREN) compared to S31803 (30-34 PREN), making it better suited for harsh chemical or seawater environments. Both are often dual-certified as 2205 stainless steel.
UNS S32205 vs. S31803: Chemical Composition
| Element | UNS S31803 (%) | UNS S32205 (%) | Difference / Significance |
| Chromium (Cr) | 21.0 – 23.0 | 22.0 – 23.0 | S32205 has a higher Cr minimum. |
| Nickel (Ni) | 4.5 – 6.5 | 4.5 – 6.5 | Same range. |
| Molybdenum (Mo) | 2.5 – 3.5 | 3.0 – 3.5 | S32205 has a higher Mo minimum. |
| Nitrogen (N) | 0.08 – 0.20 | 0.14 – 0.20 | S32205 has a higher N minimum. |
| Carbon (C) | 0.030 max | 0.030 max | Low carbon for better weldability. |
| Manganese (Mn) | 2.00 max | 2.00 max | |
| Silicon (Si) | 1.00 max | 1.00 max | |
| Phosphorus (P) | 0.030 max | 0.030 max | |
| Sulfur (S) | 0.020 max | 0.020 max |
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UNS S32205 vs. S31803: Mechanical Properties
Minimum values according to ASTM A789 / A790
| Property | UNS S31803 | UNS S32205 |
| Tensile Strength, min. | 620 MPa (90 ksi) | 620 MPa (90 ksi) |
| Yield Strength (0.2% Offset), min. | 450 MPa (65 ksi) | 450 MPa (65 ksi) |
| Elongation in 2 in. (50mm), min. | 25% | 25% |
| Hardness (Brinell), max. | 293 HBW | 293 HBW |
| Hardness (Rockwell C), max. | 31 HRC | 31 HRC |
UNS S32205 vs. S31803: Corrosion Resistance
UNS S32205 (Alloy 2205) is an upgraded, higher-performance version of UNS S31803, featuring tighter, higher-range composition limits for Chromium, Molybdenum, and Nitrogen. While both are duplex stainless steels, S32205 offers superior pitting, crevice, and stress corrosion resistance, particularly in harsh chloride-rich environments.
| Element | UNS S31803 (%) | UNS S32205 (%) | Difference / Significance |
| PREN Value* | ≥ 33 | ≥ 35 | S32205 has better pitting resistance. |
UNS S31803 vs. UNS S32205: Applications
| Application | Recommended Grade | Reason |
|---|---|---|
| Pressure Vessels | S32205 | Higher corrosion margin |
| Seawater Piping | S32205 | Better chloride resistance |
| Heat Exchangers | S32205 | Improved pitting resistance |
| Cost-Sensitive Projects | S31803 | Acceptable in mild conditions |
What is the difference between uns S32750 and uns S31803?
UNS S32750 (Super Duplex) is a higher-alloyed stainless steel with superior corrosion resistance and strength compared to UNS S31803 (Standard Duplex 2205). S32750 contains ~25% chromium and 4% molybdenum, while S31803 has ~22% chromium and 3% molybdenum, making S32750 better suited for aggressive chloride environments, marine applications, and chemical processing.
What is the difference between uns S31803 and uns S32760?
UNS S32760 is a Super Duplex stainless steel (often branded as Zeron 100) with higher chromium (25%), molybdenum, and tungsten, offering superior corrosion resistance and ~15–20% higher strength than UNS S31803 (standard 2205 Duplex, 22% Cr). S32760 is used in more extreme, high-chloride marine environments, while S31803 is ideal for general-purpose corrosion resistance.
GNEE offers a comprehensive range of UNS S31803 and UNS S32205 Duplex Stainless Steel products, fully compliant with international standards such as ASTM, ASME, and EN.
Available Product Forms: UNS S31803 / S32205 (Duplex Steel)
| Product Form | Standard Specification | Size Range (Metric / Imperial) | Surface Finish & Condition |
| Seamless Pipe | ASTM A790, ASME SA790 |
OD: 6.0 mm – 609.6 mm (1/4" – 24") WT: 0.5 mm – 40 mm (Sch 5S – Sch XXS) |
Solution Annealed & Pickled (AP) |
| Welded Pipe | ASTM A790, ASTM A928 |
OD: 12.7 mm – 2032 mm (1/2" – 80") WT: 1.0 mm – 30 mm |
Pickled, Polished, or Bead Removed |
| Heat Exchanger Tube | ASTM A789, ASME SA789 |
OD: 6.35 mm – 114.3 mm (1/4" – 4.5") WT: 0.89 mm – 8.0 mm (BWG 20# – 8#) |
Bright Annealed (BA) / Pickled (AP) |
| U-Bend Tube | ASTM A789 / A688 / A1016 |
R Range: 1.5D to 1500 mm Length: Up to 30 meters (Developed) |
Stress-relief Annealed (U-bend part) |
Click to Customize UNS S31803 Stainless Steel Tubes
Test:
Tension Test, Flattening Test, Hardness Test, or Bend Test; Hydrostatic Test or nondestructive electric test.
