ASTM A240 UNS 31803 Duplex Stainless Steel Plates And Sheets
Duplex stainless steel is a popular material in the manufacturing industry due to its excellent mechanical properties and corrosion resistance. Among the different types of duplex stainless steel, ASTM A240 UNS 31803 duplex steel is widely used for its unique characteristics.
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In this article, we will explore the features, benefits, and applications of ASTM A240 UNS 31803 duplex steel plates, sheets, and Coils.
Introduction
ASTM A240 UNS 31803 is duplex stainless steel that belongs to the family of austenitic-ferritic stainless steels. It has a high chromium and molybdenum content, which gives it excellent corrosion resistance, high strength, and good weldability. The addition of nitrogen also improves its mechanical properties and enhances its resistance to pitting and crevice corrosion.
What is ASTM A240 UNS 31803 Duplex Stainless Steel?
ASTM A240 UNS 31803 is duplex stainless steel that contains 22% chromium, 3% molybdenum, and 0.15% nitrogen. It has a microstructure that consists of both austenite and ferrite phases, which gives it a combination of high strength, good ductility, and excellent corrosion resistance. ASTM A240 Plates is the standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications.
Chemical Composition of ASTM A240 UNS 31803 Duplex Stainless Steel
Carbon (C): 0.03% max
Silicon (Si): 1.00% max
Manganese (Mn): 2.00% max
Phosphorus (P): 0.03% max
Sulfur (S): 0.02% max
Chromium (Cr): 21.0 – 23.0%
Nickel (Ni): 4.50 – 6.50%
Molybdenum (Mo): 2.50 – 3.50%
Nitrogen (N): 0.08 – 0.20%
Mechanical Properties of ASTM A240 UNS 31803 Duplex Stainless Steel
The mechanical properties of ASTM A240 UNS 31803 duplex stainless steel are as follows:
Tensile strength: 620 MPa (90 Ksi) min
Yield strength: 450 MPa (65 Ksi) min
Elongation: 25% min
Hardness: 290 HB max
Corrosion Resistance of ASTM A240 UNS 31803 Duplex Stainless Steel
ASTM A240 UNS 31803 duplex stainless steel has excellent corrosion resistance in a wide range of environments. It exhibits good resistance to corrosion in seawater and other chloride-containing environments, as well as acidic and alkaline solutions. The high chromium and molybdenum content provide ASTM A240 UNS 31803 with excellent resistance to pitting and crevice corrosion, which makes it suitable for use in aggressive and corrosive environments.
Heat Treatment of ASTM A240 UNS 31803 Duplex Stainless Steel
ASTM A240 UNS 31803 duplex stainless steel can be heat-treated to improve its mechanical properties. However, it should be noted that the heat treatment process may affect the corrosion resistance of the material. The recommended heat treatment for ASTM A240 UNS 31803 is solution annealing at 1050°C followed by water quenching.
Welding of ASTM A240 UNS 31803 Duplex Stainless Steel
ASTM A240 UNS 31803 duplex stainless steel has good weldability, and it can be welded using all conventional welding methods. However, care must be taken to avoid excessive heat input, which can cause the material to lose its duplex microstructure and reduce its corrosion resistance. The use of filler metals with a higher nickel content can also improve the toughness of the weld and reduce the risk of cracking.
Fabrication of ASTM A240 UNS 31803 Duplex Stainless Steel
ASTM A240 UNS 31803 duplex stainless steel is a versatile material that can be easily fabricated using standard techniques. It can be cold-worked, hot-worked, and formed using bending, drawing, and spinning methods. However, the material is more difficult to machine than conventional austenitic stainless steel due to its higher strength and hardness. Therefore, high cutting forces, low cutting speeds, and rigid tooling are required for machining ASTM A240 UNS 31803 Plates.
Applications of ASTM A240 UNS 31803 Duplex Stainless Steel
ASTM A240 UNS 31803 duplex stainless steel is used in a wide range of applications that require high strength, good corrosion resistance, and good weldability.
Some of the common applications of ASTM A240 UNS 31803 include:
- Chemical processing equipment
- Oil and gas exploration and production
- Desalination plants
- Heat exchangers
- Pulp and paper industry
- Marine and offshore engineering
- Food processing equipment
- Architectural applications
- Construction and so on
Comparison with Other Duplex Stainless Steel Grades
ASTM A240 UNS 31803 duplex stainless steel offers several advantages over other duplex stainless steel grades. Compared to ASTM A240 UNS S32205, ASTM A240 UNS 31803 has a higher nitrogen content, which improves its mechanical properties and corrosion resistance. ASTM A240 UNS 31803 also offers better resistance to stress corrosion cracking and higher strength than ASTM A240 UNS S32750 and ASTM A240 UNS S32760.
Availability of ASTM A240 UNS 31803 Duplex Stainless Steel Plates and Sheets
ASTM A240 UNS 31803 duplex stainless steel plates and sheets are readily available in a wide range of sizes and thicknesses from various manufacturers and suppliers. The material is also available in different finishes, including hot-rolled, cold-rolled, and annealed.
Cost of ASTM A240 UNS 31803 Duplex Stainless Steel Plates and Sheets
The cost of ASTM A240 UNS 31803 duplex stainless steel plates and sheets may vary depending on various factors such as the size, thickness, and quantity of the material. However, ASTM A240 UNS 31803 is generally more expensive than conventional austenitic stainless steels due to its higher content of chromium, molybdenum, and nitrogen.
Conclusion
ASTM A240 UNS 31803 Duplex Stainless Steel Plates and Sheets, along with other related products such as ASTM A240 Sheets and Plates and ASTM A240 430 Stainless Steel Coil, are versatile materials that offer excellent corrosion resistance and mechanical properties for a variety of industries. If you are looking for a high-quality material that can withstand harsh environments and offer long-lasting durability, consider using ASTM A240 UNS 31803 duplex stainless steel from the most trusted supplier of ASTM A240 UNS 31803 Duplex Steel in India, SV Stainless Steel, as are proud to be the leading suppliers, stockiest, and exporters of ASTM A240 UNS 31803 Duplex Steel sheets, plates, and coils in India.
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