ASTM A789 UNS S31500 Duplex Stainless Steel Tubes
ASTM A789 UNS S31500 Duplex Stainless Steel Tubes are engineered for moderate to highly corrosive environments requiring a combination of high strength, durability, and enhanced corrosion resistance. UNS S31500 is a duplex grade containing balanced amounts of ferrite and austenite, offering improved stress corrosion cracking resistance compared to standard austenitic stainless steels.
These tubes are widely used in chemical processing, marine environments, pollution control, and structural applications where performance, reliability, and cost efficiency are essential. Their superior strength-to-weight ratio and excellent resistance to chloride-induced attack make them suitable for long-term industrial use.
Key Features
- High mechanical strength with excellent toughness
- Superior resistance to chloride stress corrosion cracking
- Improved pitting and crevice corrosion resistance
- Excellent performance in marine, chemical, and mildly acidic systems
- Good weldability and formability
- Cost-effective alternative to high nickel stainless steels
Equivalent Grade
| Standard |
Grade |
| UNS |
S31500 |
| EN / DIN |
1.4460 |
| WNR |
1.4460 |
| AFNOR |
Z3CND 22.04 |
| ASTM |
224SMo (Similar) |
ASTM A789 UNS S31500 Chemical Composition
| Element |
Percentage (%) |
| Chromium (Cr) |
21.0 – 23.0 |
| Nickel (Ni) |
4.5 – 6.5 |
| Molybdenum (Mo) |
1.0 – 2.0 |
| Manganese (Mn) |
≤ 2.0 |
| Silicon (Si) |
≤ 1.0 |
| Nitrogen (N) |
0.05 – 0.15 |
| Carbon (C) |
≤ 0.03 |
| Phosphorus (P) |
≤ 0.03 |
| Sulfur (S) |
≤ 0.02 |
| Iron (Fe) |
Balance |
ASTM A789 UNS S31500 Mechanical Properties
| Property |
Value |
| Tensile Strength |
≥ 620 MPa |
| Yield Strength (0.2% Proof) |
≥ 450 MPa |
| Elongation |
≥ 25% |
| Hardness |
≤ 290 HB |
Physical Properties
| Property |
Value |
| Density |
7.80 g/cm³ |
| Thermal Conductivity |
18 W/m·K |
| Electrical Resistivity |
0.80 µΩ·m |
| Modulus of Elasticity |
200 GPa |
| Melting Range |
1350 – 1450°C |
Types of UNS S31500 Tubes
- Seamless Duplex Tubes
- Welded Duplex Tubes
- ERW Tubes
- EFW Tubes
- Heat Exchanger Tubes
- Instrumentation Tubes
- Hydraulic Tubes
Application
- Marine & Seawater Systems
- Chemical Processing Plants
- Pollution Control Equipment
- Heat Exchangers & Condensers
- Oil & Gas Processing
- Desalination Units
- Structural & Mechanical Components
- Pulp & Paper Industry
- Fertilizer & Refinery Applications
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