1.4410 vs 1.4462 Stainless Steel Tube: Corrosion Resistance
May 08, 2026
Leave a message
What is 1.4410 duplex stainless steel pipe?
1.4410 (UNS S32750, also known as 2507 or SAF 2507) is a super duplex stainless steel tube featuring a microstructure composed of approximately 50% ferrite and 50% austenite. Its high content of chromium (~25%), molybdenum (~4%), and nitrogen endows it with an exceptionally high Pitting Resistance Equivalent Number (PREN > 40), providing outstanding resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking. Consequently, it is well-suited for use in harsh environments such as seawater, desalination plants, the oil and gas industry, and chemical processing facilities.
What is 1.4462 duplex stainless steel pipe?
1.4462 duplex stainless steel pipe (commonly referred to as 2205, UNS S31803/S32205, or F51) is a high-performance duplex alloy featuring a microstructure that combines both austenitic and ferritic phases. It possesses exceptional corrosion resistance, high tensile strength, and excellent resistance to stress corrosion cracking, making it suitable for use in harsh, chloride-rich environments such as those found in marine, oil and gas, and chemical processing applications.
What is the difference between 1.4410 and 1.4462 stainless steel pipes?
1.4410 (Super Duplex) and 1.4462 (Standard Duplex) stainless steel pipes differ primarily in alloy content and corrosion resistance. 1.4410 contains higher chromium, molybdenum, and nickel, providing superior resistance to pitting and crevice corrosion in harsh environments (e.g., seawater) compared to 1.4462. 1.4410 offers higher strength, allowing for thinner walls.
1.4410 vs 1.4462 Stainless Steel Tube: Standards
| Feature | 1.4462 (Standard Duplex) | 1.4410 (Super Duplex) |
| Common Name | Duplex 2205 | Super Duplex 2507 |
| UNS Designation | S31803 / S32205 | S32750 |
| EN Standard | X2CrNiMoN22-5-3 | X2CrNiMoN25-7-4 |
| ASTM Standard | A789 / A790 | A789 / A790 |
1.4410 vs 1.4462 Stainless Steel Tube: Chemical Composition (wt%)
| Element | 1.4462 (S32205) | 1.4410 (S32750) |
| Chromium (Cr) | 22.0 – 23.0% | 24.0 – 26.0% |
| Nickel (Ni) | 4.5 – 6.5% | 6.0 – 8.0% |
| Molybdenum (Mo) | 3.0 – 3.5% | 3.0 – 5.0% |
| Nitrogen (N) | 0.14 – 0.20% | 0.24 – 0.32% |
| Carbon (C) | 0.030% max | 0.030% max |
| Iron (Fe) | Balance | Balance |
1.4410 vs 1.4462 Stainless Steel Tube:Mechanical Properties
1.4410 offers approximately 20% higher yield strength than 1.4462.
| Property | 1.4462 (Duplex 2205) | 1.4410 (Super Duplex 2507) |
| Yield Strength (0.2% Offset) |
≥ 450 MPa (65 ksi) |
≥ 550 MPa (80 ksi) |
| Tensile Strength |
≥ 655 MPa (95 ksi) |
≥ 800 - 1000 MPa (116 ksi) |
| Elongation (in 2 in.) |
≥ 25% |
≥ 25% |
| Hardness (Rockwell C) |
≤ 31 HRC |
≤ 32 HRC |
| PREN (Cr+3.3Mo+16N) | 34 – 36 |
≥ 40 – 42 |
1.4410 vs 1.4462 Stainless Steel Tube: Corrosion Resistance
1.4410 (UNS S32750, 2507) offers significantly superior corrosion resistance compared with 1.4462 (UNS S31803/S32205, 2205), particularly in resistance to chloride attack.
| Environment | 1.4462 (Duplex) | 1.4410 (Super Duplex) |
| Pitting Resistance | Very Good. Suitable for moderate chloride levels. | Excellent. Designed for high-chloride environments (Seawater). |
| Stress Corrosion Cracking | Excellent resistance. | Superior resistance, even in acidic (sour) environments. |
| Critical Pitting Temp (CPT) | Approx. 30°C - 35°C | Approx. 50°C - 55°C |
| Critical Crevice Temp (CCT) | Approx. 20°C - 25°C | Approx. 35°C - 40°C |
1.4410 vs. 1.4462 Stainless Steel Tubes: Applications
1.4462 stainless steel tubing is suitable for moderately corrosive environments, including chemical plants, offshore platforms, pressure vessels, pumps, and valves.
1.4410 stainless steel tubing is specifically designed for extremely harsh corrosive environments-including seawater desalination, deep-sea oil production, subsea pipelines, and high-chloride media-and is particularly well-suited for components exposed to seawater splash zones or continuous high-temperature, high-chloride environments.
EN 10216-5 1.4410 Stainless Steel Heat Exchanger Tube Supplier
For every batch of 1.4410 tubing we produce, we provide a Material Test Certificate (MTC) compliant with EN 10204 3.1 or 3.2. Furthermore, prior to shipment, every tube undergoes 100% Eddy Current Testing (ET) and Ultrasonic Testing (UT).
| Product Form | Standard Specification | Size Range (OD x WT) | Typical Application |
| Seamless Tube | ASTM A789, EN 10216-5 | OD: 6mm – 273mm WT: 0.5mm – 25mm | High-pressure hydraulic lines, instrumentation, heat exchangers. |
| Seamless Pipe | ASTM A790, ASME SA790 | OD: 1/2" – 24" (NB) WT: SCH 10S, 40S, 80S, XXS | Chemical processing, offshore oil & gas piping systems. |
| Welded Tube/Pipe | ASTM A790, ASTM A928 | OD: 114mm – 1219mm WT: 2mm – 30mm | Desalination plants, large diameter water treatment systems. |
| Heat Exchanger Tube | ASTM A789 / ASME SA789 | OD: 12.7mm – 38.1mm WT: 0.89mm – 3.2mm | Sea water coolers, evaporators, condensers (often U-Bent). |
| Coiled Tubing | ASTM A789 | OD: 3.18mm – 25.4mm Length: Up to 1000m+ | Subsea umbilicals, downhole chemical injection lines. |
| U-Bent Tube | Custom Drawing | As per Heat Exchanger specs | Shell and tube heat exchangers. |
High-Quality Packaging
Given the sensitivity of 1.4410 to iron ion contamination, we implement strict carbon steel segregation measures within our production facilities. Finished tubes are packaged using plastic end caps combined with vacuum sealing, or secured in anti-corrosive wooden crates, to ensure they remain free from surface contamination or scratches during long-distance ocean transport.
Send Inquiry