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Duplex Steel S31803 Pipe & Fittings are high-performance stainless steel products designed to offer superior strength and exceptional corrosion resistance. Manufactured using a balanced combination of austenitic and ferritic stainless steel, S31803 pipes and fittings provide excellent durability in harsh environments, making them ideal for chemical processing, oil and gas, and marine applications. Their duplex structure ensures resistance to stress corrosion cracking, pitting, and crevice corrosion.
These S31803 Duplex Stainless Steel Pipes are engineered to handle high-pressure and high-temperature conditions efficiently. The material’s unique composition provides better mechanical properties than standard austenitic stainless steels, allowing for thinner walls and lighter piping systems without compromising performance. This makes them an ideal choice for industries that require both strength and longevity in their piping networks.
Duplex Steel S31803 is manufactured according to ASTM A790 / A815 for pipes and ASTM A182 for fittings. These specifications ensure that the material meets international quality and dimensional standards. S31803 is often supplied in seamless, welded, and forged forms to cater to diverse piping and mechanical requirements. The duplex structure ensures superior performance in aggressive environments.
The chemical composition of Duplex S31803 includes Chromium (21–23%), Nickel (4.5–6.5%), Molybdenum (2.5–3.5%), Nitrogen (0.08–0.20%), and low Carbon (≤0.03%). This combination provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. Nitrogen enhances strength and corrosion resistance, while molybdenum provides additional protection against chloride-induced corrosion.
Duplex S31803 Fittings are precision-engineered to match the pipes in performance and durability. They include elbows, tees, reducers, and flanges that ensure leak-proof connections and seamless integration into piping systems. With excellent weldability and formability, these fittings simplify installation while maintaining the integrity and safety of the overall system.
The chemical composition of Duplex S31803 Stainless Steel includes chromium, nickel, molybdenum, and nitrogen, which collectively enhance corrosion resistance and mechanical strength. These properties make S31803 pipes and fittings highly suitable for aggressive environments, including seawater, chemical plants, and petrochemical industries. Additionally, the duplex structure reduces the risk of chloride stress corrosion cracking, a common issue in standard stainless steels.
S31803 duplex steel exhibits excellent mechanical properties, with a minimum tensile strength of 620–880 MPa and yield strength of 450–620 MPa. Its high elongation of 25–35% ensures ductility, while the material maintains toughness even at low temperatures. These properties allow Duplex S31803 pipes and fittings to withstand high pressures and mechanical stresses in critical piping systems.
Duplex S31803 pipes are manufactured using seamless and welded methods, while fittings are forged and machined to precise dimensions. The manufacturing process includes solution annealing and controlled cooling to maintain the duplex structure. This process ensures uniform grain structure, improved toughness, and enhanced corrosion resistance in demanding environments.
Specification Table
| Specification | Details |
|---|---|
| Material Grade | S31803 / UNS S31803 / 1.4462 |
| Type | Duplex Stainless Steel (Balanced Austenitic-Ferritic Structure) |
| Form | Pipes, Tubes, Fittings (Elbows, Tees, Reducers, Flanges) |
| Corrosion Resistance | Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking |
| Mechanical Properties | High strength with superior toughness compared to standard austenitic stainless steels |
| Temperature Range | Suitable for high-temperature and high-pressure applications |
| Applications | Chemical, Petrochemical, Oil & Gas, Marine, and Water Treatment Industries |
Chemical Composition (Typical ranges for SSS31803)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| 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 |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620 – 850 |
| Yield Strength (MPa) | 450 – 550 |
| Elongation (%) | 25 – 35 |
| Hardness (HB) | ≤ 280 |
| Impact Strength (Charpy V-notch) | ≥ 60 J at 0°C |
| Modulus of Elasticity (GPa) | 200 |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S31803 |
| EN / DIN | 1.4462 |
| AISI / ASTM | ASTM A182 F51, ASTM A790 F51 |
| JIS | – |
| Other International Standards | SAF 2205 |
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.
| Nominal Size (inch) | Outer Diameter (mm) | Schedule | Wall Thickness (mm) | Approx. Weight (kg/m) |
|---|---|---|---|---|
| 1/2" | 21.3 | 10S | 2.77 | 1.35 |
| 3/4" | 26.7 | 10S | 2.87 | 1.80 |
| 1" | 33.4 | 10S | 3.38 | 2.44 |
| 1 1/2" | 48.3 | 10S | 3.91 | 4.41 |
| 2" | 60.3 | 10S | 4.01 | 6.00 |
| 3" | 88.9 | 10S | 4.78 | 10.50 |
| 4" | 114.3 | 10S | 5.54 | 16.00 |
| 6" | 168.3 | 10S | 7.11 | 29.70 |
| 8" | 219.1 | 10S | 8.18 | 46.20 |
| 10" | 273.0 | 10S | 9.27 | 68.60 |
| 12" | 323.9 | 10S | 9.53 | 90.00 |
Types Of Pipe Fittingss and Tubes
Tube Unions
Bite Type Tube Fittings
Stainless Steel Pipe Fittings
Forged Fsitting
Fitting
Carbon Steel Butt Weld Pipe Fittings
Frequently Asked Questions (FAQ)
Q1: What is Duplex Steel S31803?
A1: Duplex Steel S31803 is a high-performance stainless steel with a balanced austenitic-ferritic microstructure, offering excellent corrosion resistance and high strength for industrial applications.
Q2: Where are S31803 pipes and fittings commonly used?
A2: S31803 pipes and fittings are widely used in chemical processing, petrochemical, oil & gas, marine environments, and water treatment industries due to their resistance to corrosion and stress cracking.
Q3: What are the key advantages of Duplex S31803 over standard stainless steels?
A3: Duplex S31803 offers higher tensile and yield strength, better resistance to pitting, crevice, and stress corrosion cracking, and allows for lighter and thinner piping systems compared to standard austenitic stainless steels.
Pipes & Fittingss Supplier
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