Chemical properties of stainless steel 321 plate
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Chemical properties of stainless steel 321 plate
321 stainless steel plate is a titanium-stabilized austenitic alloy (18/8) known for its excellent high-temperature strength, oxidation resistance, and corrosion resistance, performing particularly well in high-temperature environments (800-1500°F). This is due to the titanium element preventing carbide precipitation. Its main components include 17-19% chromium, 9-12% nickel, and at least five times the combined carbon and nitrogen content in titanium. It is similar to 304 stainless steel but offers superior performance in high-temperature applications, making it ideal for use in chemical processing, aerospace, and exhaust systems.
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Will 321 stainless steel rust?
Corrosion Resistance
Annealed Carpenter 321 stainless steel is resistant to atmospheric corrosion, food corrosion, disinfectant corrosion, corrosion from various organic chemicals and dyes, and corrosion from various inorganic chemicals. It exhibits excellent resistance to intergranular corrosion.
Stainless steel contains at least 10.5% chromium, less than 1.2% carbon, and other alloying elements.
Grade 321 is a basic austenitic 18/8 stainless steel, similar to 304, but stabilized with the addition of titanium. 321 stainless steel sheets prevent the formation of chromium carbides through the addition of titanium. The advantage of 321 stainless steel is that it does not undergo intergranular corrosion after heating within the carbide precipitation temperature range of 425°C to 850°C.
Like other austenitic stainless steels, 321 stainless steel has excellent formability and weldability, and is easily bent or rolled into shape. No annealing treatment is required after welding. 321 stainless steel also exhibits extremely high toughness even at very low temperatures. However, because it cannot be polished, it is not suitable for decorative applications.
Chemical Properties of 321 Plates
| Element | % of chemical |
| Chromium (C) | 17.00 min. to 19.00 max |
| Nickel (Ni) | 9.00 min. to 12.00 max. |
| Carbon (C) | 0.08 |
| Manganese (Mn) | 2.00 |
| Phosphorus(P) | 0.045 |
| Sulfur(S) | 0.03 |
| Silicon (Si) | 0.75 |
| Titanium (Ti) | 5 x (C + N) min. to 0.70 max |
| Nitrogen (N) | 0.10 |
| Iron (Fe) | Balance |
Mechanical properties of 321 stainless steel plate
| Property | Condition/Temper | Typical Value/Range (Metric - SI Units) | Typical Value/Range (Imperial Units) | Reference Standard for Test Method |
|---|---|---|---|---|
| Tensile Strength | Annealed | 520 - 750 MPa | 75 - 109 ksi | ASTM E8 |
| Yield Strength (0.2% offset) | Annealed | 205 - 310 MPa | 30 - 45 ksi | ASTM E8 |
| Elongation | Annealed | 40% min | 40% min | ASTM E8 |
| Hardness (Rockwell B) | Annealed | 70 - 90 HRB | 70 - 90 HRB | ASTM E18 |
| Impact Strength (Charpy) | -20°C | 40 J | 30 ft-lbf | ASTM E23 |
About 321 Stainless Steel Plates
321 alloy stainless steel plates offer good overall corrosion resistance compared to 304 stainless steel. It is particularly suitable for the chromium carbide precipitation temperature range of 1800 to 1500 degrees Fahrenheit (427 to 816 degrees Celsius), where non-stabilized alloys such as 304 are susceptible to intergranular corrosion.
At elevated temperatures, this alloy can be used with most dilute organic acids, as well as pure organic acids, phosphoric acid at low temperatures, and dilute solutions up to 10% concentration at high temperatures. 321 stainless steel prevents polythionic acid stress corrosion cracking in hydrocarbon processing.
Due to its good mechanical properties, 321 stainless steel plates are also suitable for high-temperature applications. 321 alloy stainless steel plates have better creep and stress rupture properties than 304 and 304L, and should therefore be used in applications where sensitization and intergranular corrosion are a concern. Grade 321 plates are the preferred material for applications up to approximately 900°C, offering resistance to scaling, combined with high strength, phase stability, and resistance to subsequent aqueous corrosion. At low temperatures, it can also be used in caustic solutions free of chlorides or fluorides. Except for low concentrations, 321 alloy stainless steel plates do not perform well in chloride or sulfuric acid solutions.
Gnee Steel specializes in the production of a wide range of stainless steel products. Gnee Steel's product packaging includes: Steel Strapping: Pipes with an outer diameter of 3 inches or less are typically strapped together with polypropylene film to prevent rust during ocean shipping, and then secured with steel strapping. Wooden Cases/Crates: Pipes are typically packaged in wooden cases or crates to protect the pipes during transportation, especially those that are longer or have larger diameters. Seaworthy Export Packaging: Suppliers typically use standard seaworthy export packaging methods, which may include a variety of materials and techniques to protect the pipes during transportation. Tarpaulin Packaging: This prevents rain, seawater, and other external factors from penetrating the export crates during transportation. Gnee Steel specializes in the production and sale of alloy materials. Gnee Steel's products are widely used in the aerospace, chemical, power, automotive, and nuclear energy sectors, and we can provide customized alloy material solutions based on customer needs. For alloy material pricing or customized alloy material solutions, please contact us for a quote: ru@gneesteelgroup.com