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Duplex Steel S31803 Round Bar is a highly efficient stainless steel product designed to deliver an excellent balance of strength, corrosion resistance, and durability. It belongs to the family of duplex stainless steels, which have a dual-phase microstructure consisting of austenite and ferrite. This unique composition gives the material superior mechanical and corrosion-resistant properties. It is widely used in chemical, marine, and oil & gas industries.
The chemical composition of Duplex Steel S31803 includes chromium, nickel, molybdenum, and nitrogen in precise proportions. Typically, it contains around 22% chromium, 5–6% nickel, and 3% molybdenum, which enhance its corrosion resistance and mechanical strength. The balanced microstructure ensures better performance than conventional stainless steels. These elements together make the alloy suitable for demanding industrial environments.
Duplex Steel S31803 Round Bars exhibit exceptional tensile strength and toughness. The alloy has a tensile strength of approximately 620 MPa and yield strength around 450 MPa, making it twice as strong as standard austenitic stainless steels. It also maintains good elongation and hardness, providing excellent performance under mechanical stress. These properties make it ideal for high-pressure and load-bearing applications.
One of the standout features of Duplex Steel S31803 is its outstanding resistance to corrosion and pitting. The presence of molybdenum and chromium offers strong protection against chloride-induced stress corrosion cracking. It performs well in seawater, acidic solutions, and other harsh environments. This makes it a preferred material for industries exposed to corrosive chemicals and saline conditions.
Duplex Steel S31803 Round Bars can withstand moderate to high temperatures without losing strength or resistance. They maintain structural stability even in oxidizing and reducing environments. However, exposure to temperatures above 300°C for prolonged periods may reduce toughness. Therefore, the alloy is best suited for applications that require thermal stability along with corrosion resistance.
The alloy is easily fabricated using conventional methods such as welding, forging, and machining. Proper precautions are necessary to prevent heat cracking during welding, but overall weldability is excellent. Duplex Steel S31803 can be cold worked to achieve higher strength levels, and its machinability is better than many other duplex grades. Post-fabrication heat treatment enhances its corrosion performance further.
Duplex Steel S31803 Round Bars are extensively used in chemical processing, oil & gas refining, and power generation industries. They are also used in heat exchangers, condensers, and pressure vessels where both strength and corrosion resistance are required. Their durability and reliability make them a cost-effective solution for long-term performance.
In marine environments, Duplex Steel S31803 is an excellent choice for propeller shafts, marine fasteners, and seawater piping systems. It resists saltwater corrosion far better than conventional stainless steels. Offshore platforms and desalination plants benefit from its high mechanical strength and chloride resistance, reducing maintenance needs and improving service life.
Specification Table
| Property | Specification | Unit |
|---|---|---|
| Grade | S31803 / UNS S31803 | - |
| Standards | ASTM A182, ASTM A276, EN 10088-1 | - |
| Material Type | Duplex Stainless Steel | - |
| Density | 7.8 | g/cm³ |
| Melting Point | 1370–1400 | °C |
| Tensile Strength | 620–850 | MPa |
| Yield Strength | 450–620 | MPa |
| Elongation | 25–30 | % |
| Hardness | 250–300 | HB |
| Max Operating Temperature | 300–350 | °C |
| Corrosion Resistance | Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking | - |
| Welding | Weldable using standard stainless steel techniques | - |
Chemical Composition (Typical ranges for SSS31803)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition Range | Unit |
|---|---|---|
| Carbon (C) | ≤ 0.03 | % |
| Chromium (Cr) | 21.0 – 23.0 | % |
| Nickel (Ni) | 4.5 – 6.5 | % |
| Molybdenum (Mo) | 2.5 – 3.5 | % |
| Manganese (Mn) | ≤ 2.0 | % |
| Silicon (Si) | ≤ 1.0 | % |
| Nitrogen (N) | 0.08 – 0.20 | % |
| Phosphorus (P) | ≤ 0.03 | % |
| Sulfur (S) | ≤ 0.02 | % |
| Iron (Fe) | Balance | % |
Mechanical Properties (Typical)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (UTS) | 620 – 850 | MPa |
| Yield Strength (0.2% offset) | 450 – 620 | MPa |
| Elongation | 25 – 30 | % |
| Hardness (Brinell) | 250 – 300 | HB |
| Impact Toughness (Charpy V-Notch) | > 100 | J at -40°C |
| Modulus of Elasticity | 200 | GPa |
| Elongation at Break | 25 – 30 | % |
| Density | 7.8 | g/cm³ |
| Max Operating Temperature | 300 – 350 | °C |
Equivalent S31803s
| Standard | Equivalent Grade |
|---|---|
| UNS | S31803 |
| EN / DIN | 1.4462 |
| AISI / ASTM | ASTM A182 F51, ASTM A276 F51 |
| JIS | SUS329J1 |
| Others | X2CrNiMoN22-5-3 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Diameter (mm) | Weight per Meter (kg/m) | Approx. Tolerance (mm) |
|---|---|---|
| 6 | 0.222 | ±0.1 |
| 8 | 0.395 | ±0.1 |
| 10 | 0.617 | ±0.1 |
| 12 | 0.888 | ±0.1 |
| 16 | 1.580 | ±0.1 |
| 20 | 2.470 | ±0.2 |
| 25 | 3.850 | ±0.2 |
| 32 | 6.320 | ±0.2 |
| 40 | 9.860 | ±0.3 |
| 50 | 15.40 | ±0.3 |
| 60 | 22.20 | ±0.4 |
| 80 | 39.50 | ±0.5 |
| 100 | 61.40 | ±0.5 |
Types Of Duplex Steel S31803 Round Bars and Tubes
Stainless Steel Round Bar
Monel 400 K400 Round Bar
Hastelloy Round Bar
Inconel 600 Round Bar
Nickel Alloy Round Bar
Super Duplex Round Bar
Monel K500 Round Bar
Inconel 625 Round Bar
Frequently Asked Questions (FAQ)
1. What is Duplex Steel S31803?
It is a duplex stainless steel with a mixed microstructure of austenite and ferrite, offering high strength and excellent corrosion resistance.
2. What is the chemical composition?
Contains Cr (21–23%), Ni (4.5–6.5%), Mo (2.5–3.5%), N (0.08–0.20%), with C, Mn, Si in smaller amounts; Fe is the balance.
3. What are the mechanical properties?
Tensile strength: 620–850 MPa, Yield strength: 450–620 MPa, Elongation: 25–30%, Hardness: 250–300 HB.
4. Is it corrosion-resistant?
Yes, it resists pitting, crevice corrosion, and stress corrosion cracking, especially in chloride environments.
5. Can it be welded?
Yes, using standard stainless steel welding techniques with controlled heat input.
6. Typical applications?
Chemical processing equipment, pressure vessels, pipelines, heat exchangers, desalination plants, and marine hardware.
7. Relevant standards?
ASTM A182, ASTM A276, UNS S31803, EN 10088-1.
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