Alloy Geek 347 Stainless Steel Standard

Your Analysis Type: X-Ray Fluorescence (XRF)
Pedigree: Certified Reference Material (includes certified chemical analysis)
Sale price$249.95


Alloy Geek 347 Stabilized Austenitic Stainless Steel Standard

Alloy 347, also known as UNS S34700, is a stabilized austenitic stainless steel alloy. It's specifically designed to offer improved high-temperature corrosion resistance compared to standard austenitic stainless steels. Alloy 347 contains niobium (columbium) which helps to stabilize the alloy against sensitization and intergranular corrosion, making it suitable for applications in high-temperature environments.

The composition of Alloy 347 typically includes:

  • Chromium (Cr): Around 17.0-20.0%
  • Nickel (Ni): Around 9.0-13.0%
  • Niobium (Columbium, Cb): Around 10x(C%) - 1.0%
  • Manganese (Mn): Around 2.0% max
  • Silicon (Si): Around 0.75% max
  • Carbon (C): Around 0.08% max
  • Phosphorus (P): Around 0.045% max
  • Sulfur (S): Around 0.030% max
  • Iron (Fe): Remaining balance

Key features and characteristics of Alloy 347:

  1. High-Temperature Corrosion Resistance: Alloy 347 offers improved resistance to sensitization and intergranular corrosion at elevated temperatures, making it suitable for applications involving exposure to high temperatures and corrosive environments.

  2. Stabilization: The addition of niobium provides stabilization against sensitization and subsequent intergranular corrosion. This allows the alloy to maintain its corrosion resistance even after exposure to high temperatures.

  3. Applications: Alloy 347 is commonly used in applications where exposure to high temperatures and corrosive environments is expected. It's used in industries such as chemical, petrochemical, and power generation. Common applications include exhaust systems, boiler tubes, and high-temperature equipment.

  4. Weldability: The alloy has good weldability and can be used in welded components. Post-weld heat treatment might be necessary to restore corrosion resistance in the heat-affected zone.

  5. Formability: Alloy 347 can be formed and fabricated using standard methods.

  6. Magnetic Properties: Alloy 347 is generally non-magnetic in the annealed condition.

  7. Forms: Alloy 347 is available in various forms, including sheets, plates, bars, and pipes.

Due to its resistance to sensitization and intergranular corrosion, Alloy 347 is often chosen for applications that involve exposure to high temperatures and corrosive environments. If you're considering using Alloy 347 for a specific project, consulting with materials experts or manufacturers is recommended to ensure it meets your desired performance requirements, especially in terms of high-temperature corrosion resistance, weldability, and compatibility with the specific conditions of your application.

Reference Material (RM): A reference material, or RM, is a material with a known composition or property that is used for informational purposes to look at analytical instruments, methods, or procedures. It serves as a point of comparison to ensure the accuracy and reliability of measurements. Reference materials can vary in terms of their level of characterization and traceability. Some reference materials may have well-defined properties, but they might not have undergone the rigorous testing and certification process that certified reference materials (CRMs) undergo. Reference Material chemical compositions are for information purposes.

Certified Reference Material (CRM): A certified reference material, or CRM, is a type of reference material that has been thoroughly analyzed and characterized using multiple validated methods to determine its composition or properties. The results of these analyses are then used to establish certified values, along with associated uncertainties. CRMs are produced and certified by accredited organizations or laboratories following internationally recognized standards, such as ISO Guide 34 (ISO 17034). The certification process includes interlaboratory comparison and statistical analysis to ensure accuracy and traceability.

In summary, the main difference between a reference material and a certified reference material lies in the level of characterization, validation, and certification. CRMs have undergone a more comprehensive and rigorous testing process, resulting in certified values and uncertainties that can be confidently used for instrument calibration, quality control, and research. Reference materials, on the other hand, can provide a point of comparison but do not have the same level of certification and traceability as CRMs. When accuracy and traceability are critical, certified reference materials are preferred.

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