Corrosion resistance of 00Cr20Ni18Mo6CuN (254SMO) steel

Corrosion Resistance of 0Cr20Ni18Mo6CuN(254SMO) Steel

Alloy 254SMO (00Cr20Ni18Mo6CuN), also known by UNS S31254 or 1.4547, is a super austenitic stainless steel with a high level of molybdenum and nitrogen, providing high resistance to pitting and crevice corrosion as well as high strength compared to conventional austenitic stainless steels.

Physical Properties of 255SMO

The physical properties of 254SMO steel are:

Tensile Strength: 871-1246 MPa

Yield Strength: 654 MPa

Elongation at Break: 22-50%

Density: 7.7-8.1 g/cm3

Modulus of Elasticity: 193 GPa

Chemical Composition of 255SMO

The chemical composition of 254SMO steel is as follows:

C: 0.02%

Si: 0.8%

Mn: 2.0%

P: 0.045%

S: 0.015%

Cr: 20%

Ni: 18%

Mo: 6%

Cu: 1.4%

N: 0.18%

The high Mo and Cu content make this alloy very resistant to pitting and crevice corrosion.

Corrosion Resistance of 255SMO

Alloy 254SMO exhibits excellent corrosion resistance in both oxidising and reducing media. It is resistant to a wide range of chemicals, including strong acids and alkalis, salt water and some industrial chemicals.

It is therefore suitable for use in applications where corrosion resistance is a key requirement.

It can be used in environments with temperatures up to 350°C, allowing it to be used in welded and brazed components where high temperatures are expected.

It can also be used in low temperature systems down to -100°C.

Conclusion

Alloy 254SMO offers excellent corrosion resistance and strength, making it an ideal choice for applications where these properties are necessary. It is resistant to a wide range of chemicals including strong acids and alkalis and is suitable for use in a wide range of temperatures, making it a versatile material for many applications.

254SMO is a super austenitic stainless steel alloy with an exceptionally high level of resistance to corrosion, pitting and crevice corrosion in chloride environments. It is designed for use in a wide range of aggressive environments and is widely used in a variety of industries, from power generation, oil and gas production and transmission to marine, chemical processing and desalination.

254SMO is a high-alloy stainless steel grade with a high chromium and molybdenum content, featuring a balanced chemistry for improved resistance to pitting, uniform corrosion and superior strength. It has a high nickel content, typically between 19 and 23 wt%, which provides resistance to a broad range of corrosive environments. The copper content improves resistance to localized corrosion such as pitting, while the nitrogen content enhances its mechanical properties, making it suitable for a number of extreme applications.

The outstanding corrosion resistance of 254SMO is widely attributed to its high molybdenum content, which provides increased resistance to localized corrosion and chloride induced pitting. It also features a high chromium content, greater than 18 wt%, which provides a passivating oxide film for protection in many media and a high nickel content for a balanced corrosion resistance.

In summary, 254SMO is an outstanding alloy for use in extreme environments, where corrosion resistance is essential. Its composition provides exceptional levels of resistance to crevice corrosion and pitting in chloride environments, as well as uniform corrosion resistance in acidic and basic media applications. The combination of high chromium and molybdenum contents provide excellent resistance to general corrosion and stress corrosion cracking, while the high nickel content helps to resist both localized and uniform corrosion in a wide range of applications.