Super Duplex S32550 Pipe Supplier in China
Super duplex S32550 pipe (also known as Ferralium 255) is a high-performance duplex stainless steel pipe featuring an approximately equal ratio of austenitic and ferritic microstructures.Boasting exceptional strength,it is the only super duplex steel achieving a minimum yield strength of 85 ksi (586 MPa).With a PREN exceeding 40,it exhibits outstanding resistance to pitting,crevice corrosion,and stress corrosion cracking in highly chlorinated environments such as seawater.The addition of copper significantly enhances its tolerance to sulfuric,nitric,and phosphoric acids.
Aplicações
Super duplex S32550 pipes are used in heavy industrial environments where standard stainless steel fails due to extreme corrosion or mechanical stress.Its applications include but are not limited to oil and gas,chemical processing,marine and desalination,pulp and paper,mining and metallurgy,and pollution control.
UNS S32550 Equivalent Designations
- UNS S32550
- W.Nr. 1.4507
- EN X2CrNiMoCuN 25-6-3
- ASTM/ASME Grade F61
- ISO Grade X2CrNiMoN 25-6-3
- AFNOR Z3 CNDU 25-07 Az
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Chemical Composition of Super Duplex S32550 Pipe, wt.%
The chemical composition of the super duplex S32550 pipe is balanced to ensure an approximate 50/50 ratio of austenite and ferrite.Compared to other super duplex stainless steels,its notable characteristic is a higher copper content.
| Cr | Ni | Mo | Cu | N | Mn | Si | C | P | S | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| 24.0 – 27.0 | 4.5 – 6.5 | 2.9 – 3.9 | 1,5 – 2,5 | 0.10 – 0.25 | ≤ 1.50 | ≤ 1.00 | ≤ 0.04 | ≤ 0.04 | ≤ 0.03 | Equilíbrio |
What is The Main Difference Between The S32550 And The S32750?
The most fundamental difference lies in the copper content.S32550 contains 1.5% to 2.5% copper,while S32750 typically limits its copper content to below 0.5%.This enables S32550 to significantly outperform other grades in corrosive acids such as sulfuric,nitric,and phosphoric acids.
How is The 50/50 Composition Ratio Controlled Through Chemical Composition?
The most fundamental difference lies in the copper content.S32550 contains 1.5% to 2.5% copper,while S32750 typically limits its copper content to below 0.5%.This enables S32550 to significantly outperform other grades in corrosive acids such as sulfuric,nitric,and phosphoric acids.
Mechanical Properties of Super Duplex S32550 Pipe
| Resistência à tracção | Resistência ao escoamento (0,2% Offset) | Alongamento | Dureza (máx.) |
|---|---|---|---|
| ≥ 760 MPa(110 ksi) | ≥ 550 MPa(80 ksi) | ≥ 15% | 297 HBW(31 HRC) Max |
How Much Stronger is S32550 Than Ordinary Stainless Steel?
Its yield strength typically ranges around 85 ksi (586 MPa),which is nearly double that of 316L austenitic stainless steel and approximately 25% higher than standard duplex steel 2205.This allows for the use of thinner wall thicknesses in high-pressure piping designs,thereby reducing overall weight and lowering costs.
Can The S32550 Be Used in Low-temperature Environments?
Sim,but with limitations.It maintains good impact toughness at temperatures as low as -50°F (-46°C).However,it is not suitable for cryogenic or deep-cold applications (such as LNG environments),where austenitic stainless steels (e.g., 304/316) perform better.This is because duplex stainless steel undergoes a ductile-to-brittle transition at extremely low temperatures.
Super Duplex S32550 Pipe Physical & Thermal Properties
- Density:7.81 g/cm³ (0.282 lb/in³).
- Melting Range:1350°C – 1450°C (2460°F – 2640°F).
- Modulus of Elasticity:199 – 200 GPa(29.0 × 106 psi)
- Índice de Poisson: 0,3
- Magnetic:Magnetic.
| Propriedade | Temperatura | Metric Value | Imperial Value |
|---|---|---|---|
| Condutividade térmica | 20°C (68°F) | 14.2 W/m·K | 8.2 BTU/ft·h·°F |
| 100°C (212°F) | 15.5 W/m·K | 9.0 BTU/ft·h·°F | |
| Coeficiente médio de expansão térmica | 20–100°C | 11.1 x 10⁻⁶ /°C | 6.2 x 10⁻⁶ /°F |
| 20–200°C | 12.1 x 10⁻⁶ /°C | 6.7 x 10⁻⁶ /°F | |
| Calor específico | 20°C (68°F) | 475 J/kg·K | 0.11 BTU/lb·°F |
| Faixa de fusão | – | 1350 – 1450°C | 2460 – 2640°F |
FAQs About Super Duplex S32550 Pipe
- Upper Limit:
Typically restricted to 270°C (525°F).Exceeding this temperature causes “475°C embrittlement,”rendering the pipe as brittle as glass. - Lower Limit:
Typically -50°C (-58°F).While superior to carbon steel,it remains unsuitable for cryogenic applications such as liquefied natural gas (-162°C).
S32550 exhibits superior corrosion resistance in non-oxidizing acids (such as sulfuric acid and phosphoric acid) due to its copper content.S32750 contains no copper or only trace amounts,making it primarily suited for high-chloride seawater environments.
Sim.S32550 complies with the NACE MR0175 / ISO 15156 standard and is resistant to sulfide stress cracking (SSC).As a result,it is widely used in tubing and gathering pipelines for deepwater acidic oil and gas fields.
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