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ASME SB 424 Material Standard
ASTM B424 and ASME SB 424 are specifications established by the American Society for Testing and Materials (ASTM) and the American Society of Mechanical Engineers (ASME), respectively. These standards govern the properties and characteristics of nickel-iron-chromium-molybdenum-copper alloys (commonly referred to as SB 424 material) in the form of plates and coils.
ASME SB 424 Standard Grades Covered:
ASTM B424 / ASME SB 424 encompasses various grades of nickel-iron-chromium-molybdenum-copper alloys, each designed to meet specific industrial requirements. Some of the commonly included grades are:
1. Alloy 825 (UNS N08825, 2.4858): ASME SB 424 N08825 plate is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium, known for its exceptional corrosion resistance in various environments, including acidic and chloride-containing media.
2. Alloy 825HT (UNS N08825HT): A high-temperature version of Alloy 825, offering enhanced mechanical properties and oxidation resistance at elevated temperatures.
3. Alloy 825LCF (UNS N08825LCF): Low-carbon grade of Alloy 825, optimized for improved resistance to intergranular corrosion in sensitizing environments.
Chemical Composition of SB 424 UNS N08825
| Element | Content (%) | Role in Alloy |
| Nickel (Ni) | 38.0 - 46.0 | Resistance to stress corrosion cracking |
| Iron (Fe) | Balance | Provides structural integrity |
| Chromium (Cr) | 19.5 - 23.5 | Resistance to oxidizing environments |
| Molybdenum (Mo) | 2.5 - 3.5 | Resistance to pitting and crevice corrosion |
| Copper (Cu) | 1.5 - 3.0 | Resistance to sulfuric acid |
| Titanium (Ti) | 0.6 - 1.2 | Stabilizes against intergranular corrosion |
Characteristics of SB 424 Material:
1. Corrosion Resistance: SB 424 alloys, particularly Alloy 825, exhibit outstanding resistance to corrosion, making them suitable for applications in harsh environments such as chemical processing, oil and gas production, and marine engineering.
2. High Temperature Performance: With the addition of elements like molybdenum and titanium, SB 424 materials offer excellent resistance to oxidation and creep at elevated temperatures, ensuring reliable performance in high-temperature applications.
3. Mechanical Properties: SB 424 alloys possess favorable mechanical properties, including high tensile strength, yield strength, and elongation, enabling them to withstand mechanical stress and deformation in demanding operational conditions.
4. Weldability: These materials are generally weldable using standard welding techniques, allowing for the fabrication of complex structures and components with ease.
5. Formability: SB 424 materials are available in the form of plates and coils, offering versatility in fabrication processes such as cutting, bending, and forming to meet specific design requirements.
6. Chemical Compatibility: SB 424 alloys are compatible with a wide range of industrial chemicals and fluids, ensuring long-term reliability and performance in corrosive environments.
In conclusion, ASTM B424 / ASME SB 424 standards define the specifications for nickel-iron-chromium-molybdenum-copper alloys, including grades like Alloy 825, Alloy 825HT, and Alloy 825LCF. These materials exhibit exceptional corrosion resistance, high temperature performance, and favorable mechanical properties, making them indispensable in various industries where reliability and durability are paramount.
Comparison: ASME SB 424 vs. ASTM B424
A common question from procurement officers: Are they the same?
ASTM B424: The standard for general industrial use.
ASME SB 424: Specifically for pressure-bearing applications (Boiler & Pressure Vessel Code).
Note: At Huitong Steel, we provide dual-certified material that meets both ASTM and ASME standards to ensure maximum compliance for your project.
Why Source SB 424 Plates from Huitong Steel?
Buying high-nickel alloys requires trust. We provide:
Full Traceability: Every plate is marked with Heat Number, Size, and Standard.
Certified Quality: MTC issued according to EN 10204 3.1.
Third-Party Inspection: We welcome SGS, TUV, BV, or ABS inspections.
Stock & Customization: Large inventory of standard sizes and precision plasma cutting services.
Request a Quote Today
Looking for competitive pricing on ASME SB 424 UNS N08825 plates? Our technical team is ready to assist with your material selection and logistics.
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