UNS S31254

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UNS S31254

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The Versatility and Strength of UNS S31254 Bushings

Bushings are essential components in various mechanical applications, providing support, reducing friction, and ensuring smooth operation. When it comes to demanding environments, the choice of material for these bushings becomes critical. One such material that stands out is UNS S31254, a super austenitic stainless steel known for its exceptional properties. In this blog post, we will explore the benefits and applications of bushings made from UNS S31254, particularly those that are custom-sized and finished to perfection.

Why Choose UNS S31254 for Bushings?

UNS S31254, also known as 6% Mo super austenitic stainless steel, is a high-performance alloy that combines several desirable properties:

  • Corrosion Resistance: UNS S31254 offers excellent resistance to pitting and crevice corrosion, making it ideal for use in harsh environments such as seawater and industrial applications.
  • Mechanical Strength: With a yield strength typically over 300 MPa, this alloy provides the necessary strength for demanding applications while maintaining high ductility.
  • Durability: The alloy’s resistance to various forms of corrosion ensures long-lasting performance, reducing the need for frequent replacements and maintenance.
  • Versatility: UNS S31254 can be used as an alternative to 300 series austenitic stainless steels in applications requiring higher mechanical strength and enhanced corrosion resistance.

Manufacturing Process of UNS S31254 Bushings

Creating bushings from UNS S31254 involves several meticulous steps to ensure the final product meets the highest standards of quality and performance:

  1. Design and Material Selection: The process begins with designing the bushing according to the specific requirements of the application. This includes defining dimensions and selecting UNS S31254 for its superior properties.
  2. Cutting and Shaping: The selected material is cut and shaped into the desired form. This can involve machining processes such as turning, boring, and milling to achieve precise dimensions and surface finishes.
  3. Finishing: After shaping, the bushings undergo finishing processes to smooth surfaces, remove burrs, and apply any necessary surface treatments. This step is crucial for enhancing corrosion resistance and wear properties.
  4. Quality Control: The final bushings are subjected to rigorous quality control measures, including dimensional checks and material property tests, to ensure they meet specified standard.

Applications of UNS S31254 Bushings

Bushings made from UNS S31254 are suited for a wide range of applications due to their robust properties:

  • Marine and Offshore: The excellent corrosion resistance makes these bushings ideal for use in seawater environments, such as in marine engines and offshore platforms.
  • Chemical Processing: The alloy’s resistance to various chemicals and high temperatures makes it suitable for use in chemical processing equipment.
  • Food Processing: UNS S31254 bushings can be used in food processing equipment where hygiene and resistance to frequent cleaning are essential.
  • Automotive and Aerospace: The high strength and durability of these bushings make them suitable for critical applications in automotive and aerospace industries, where they help reduce friction and wear in moving parts.

Custom Sizes and Finishes

One of the significant advantages of using UNS S31254 for bushings is the ability to customize sizes and finishes to meet specific application needs. Customization ensures that the bushings fit perfectly and perform optimally in their intended environments. Manufacturers like MW Components and B&B Manufacturing offer tailored solutions, ensuring that each bushing is designed and produced to exact specifications.

Conclusion

UNS S31254 bushings provide a reliable and durable solution for various demanding applications. Their exceptional corrosion resistance, mechanical strength, and versatility make them a preferred choice for industries ranging from marine to automotive. By opting for custom-sized and finished bushings, you can ensure optimal performance and longevity in your specific application. Whether you are dealing with harsh industrial environments or require high-precision components, UNS S31254 bushings are an excellent investment in quality and reliability.

Overview of UNS S31254 (254 SMO)

UNS S31254, commonly known as 254 SMO, is a highly alloyed austenitic stainless steel engineered for optimal resistance to pitting and crevice corrosion.

Specifications of UNS S31254 (254 SMO)

  • Type: Austenitic stainless steel
  • Composition: Contains about 6% molybdenum, 20% chromium, 18% nickel, with added copper and nitrogen for enhanced corrosion resistance.
  • Properties: Features high impact resistance, toughness, excellent resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion. It also boasts very high tensile strength and is readily weldable using appropriate filler materials.

Equivalents

  • DIN/EN 1.4547: European designation for 254 SMO, sharing the same chemical composition and mechanical properties.
  • ASTM A240 / ASME SA-240: American standards that outline specifications for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and general applications, applicable to UNS S31254.
  • F44: Commonly used name in American standards for UNS S31254.
  • 00Cr20Ni18Mo6CuN: Chinese national standard designation, indicating a composition of 20% chromium, 18% nickel, and 6% molybdenum, along with copper and nitrogen.

Applications

254 SMO is employed in various settings demanding high corrosion resistance, including:

  • Chemical Processing Industries
  • Offshore Oil and Gas Production
  • Desalination Plants
  • Pulp and Paper Industries
  • Marine Environments

Forms and Finishes

Available in multiple forms such as plates, sheets, coils, and strips, 254 SMO can also be supplied in a range of surface finishes including hot rolled, cold rolled, polished, and more.

In summary, UNS S31254 (254 SMO) stands out as a versatile and highly corrosion-resistant austenitic stainless steel alloy. It is recognized globally under different standards such as DIN/EN 1.4547, ASTM A240, ASME SA-240, F44, and 00Cr20Ni18Mo6CuN, catering to a wide array of applications across several industries.

C86500 High Strength Yellow Bronze Bearings

BUSH MACHINING FINISHED

BUSH MACHINING FINISHED UNS S31254

UNS S31254 is a super austenitic stainless steel, also known as 254 SMO or F44, renowned for its exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking. This material contains high proportions of alloying elements such as chromium, nickel, molybdenum, and nitrogen, which provide it with superior corrosion resistance in chloride-containing environments, particularly in high chloride ion conditions.The chemical composition of UNS S31254 includes carbon (C), manganese (Mn), silicon (Si), phosphorus (P), sulfur (S), chromium (Cr), molybdenum (Mo), nickel (Ni), copper (Cu), and nitrogen (N). Specifically, it contains 19.5-20.5% chromium, 6.0-6.5% molybdenum, 17.5-18.5% nickel, 0.18-0.22% nitrogen, and 0.5-1.0% copper.Regarding physical properties, UNS S31254 has a density of 8.0 g/cm³ and a melting range of 1420-1460°C. Its mechanical properties include an ultimate tensile strength of 650-850 MPa, a yield strength of 300 MPa, an elongation greater than 35%, and a Brinell hardness less than 260 HB.UNS S31254 finds wide application across various industries, including chemical processing, marine environments, desalination plants, oil production, food processing, and environmental protection. It is particularly valuable in seawater handling systems, pulp and paper bleaching equipment, flue gas desulfurization units in power plants, and heat exchangers due to its corrosion resistance.When welding UNS S31254, it is recommended to use high-alloy 625 series welding consumables, such as ERNiCrMo-3 wire and ENiCrMo-3 electrodes, to ensure optimal strength properties after welding. For annealing, the material should be heated to 1149-1204°C (2100-2200°F) followed by water quenching to restore its maximum corrosion resistance.The corrosion resistance of UNS S31254 is attributed to its low carbon content and high molybdenum content. This allows the material to pass the Strauss intergranular corrosion test even after sensitization treatment at 600-1000°C. However, due to its high alloy content, intermetallic phases may precipitate at grain boundaries in the 600-1000°C range, although these precipitates do not pose a risk of intergranular corrosion when the material is used in corrosive media.
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