Alloy Geek Alloy 29-4 Stainless Steel Standard

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


Alloy Geek Alloy 29-4 Austenitic Stainless Steel

Alloy 29-4, also known as UNS N08020, is a high-alloy austenitic stainless steel with excellent resistance to corrosion in a wide range of aggressive environments, including those containing sulfuric acid, phosphoric acid, and other acids. It is often referred to as "20 Alloy" or "20Cb-3" as well.

The composition of Alloy 29-4 typically includes:

  • Chromium (about 19-21%)
  • Nickel (about 32-38%)
  • Molybdenum (about 2-3%)
  • Copper (about 3-4%)
  • Iron (about 27-32%)
  • Small amounts of other elements like manganese, silicon, carbon, and nitrogen

Key features and characteristics of Alloy 29-4:

  1. Corrosion Resistance: Alloy 29-4 is highly resistant to corrosion, particularly in aggressive environments such as sulfuric acid and phosphoric acid solutions. This makes it suitable for applications in chemical processing, petrochemical, and other industries where corrosion resistance is critical.

  2. Strength: The alloy has good mechanical strength and can maintain its properties at elevated temperatures.

  3. Weldability: Alloy 29-4 is weldable using common welding methods, though proper welding procedures should be followed to ensure the preservation of its corrosion resistance.

  4. Applications: Alloy 29-4 is commonly used in industries involving sulfuric acid production and handling, as well as in applications where strong resistance to corrosion is needed, such as in heat exchangers, chemical reactors, and tanks.

  5. Forms: Alloy 29-4 is available in various forms, including sheets, plates, bars, and tubes.

Due to its exceptional corrosion resistance, Alloy 29-4 is highly valued in industries where aggressive chemical environments are present. If you're considering using Alloy 29-4 for a specific project, consulting with materials experts or manufacturers is recommended to ensure it meets your desired performance requirements, especially in terms of corrosion resistance and compatibility with the specific chemical 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 and ISO/IEC 17025. 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 might 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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