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ASTM A312 Uns S31254 Super Duplex 2507 Stainless Steel Pipe
Material
The ASTM A312 Uns S31254 is a type of super duplex stainless steel pipe. It belongs to the austenitic-ferritic stainless steel family, which combines the desirable properties of both types of stainless steel. The material is highly resistant to corrosion, with excellent strength and toughness.
Specification
The ASTM A312 specification sets the standard for seamless, welded, and heavily cold worked austenitic stainless steel pipes. In the case of Uns S31254, the specification ensures that the pipe meets certain chemical composition, mechanical properties, and physical properties.
Key Features
Excellent corrosion resistance in a wide range of environments, including chlorides and seawater
High strength and toughness, allowing for usage in demanding applications
Good weldability and formability, making it suitable for various fabrication processes
Improved resistance to stress corrosion cracking in comparison to conventional duplex stainless steels
Chemical Composition
| Element | Composition |
| Chromium (Cr) | 20.0 - 22.0% |
| Nickel (Ni) | 17.5 - 18.5% |
| Molybdenum (Mo) | 6.0 - 6.5% |
| Nitrogen (N) | 0.18 - 0.22% |
| Carbon (C) | 0.030% max |
| Silicon (Si) | 0.80% max |
| Manganese (Mn) | 1.00% max |
| Phosphorus (P) | 0.035% max |
| Sulfur (S) | 0.010% max |
Mechanical Properties
| Property | Value |
| Tensile Strength (MPa) | 800 - 1000 |
| Yield Strength (MPa) | 550 - 750 |
| Elongation (%) | 25% min |
| Hardness (Hv) | 270 max |
| Impact Toughness (J) | 100 min |
Physical Properties
| Property | Value |
| Density (g/cm³) | 7.8 |
| Melting Range (°C) | 1320 - 1390 |
| Thermal Conductivity | 15.0 W/(m·K) |
| Electrical Resistivity | 8.0 μΩ·m |
Process Performance
| Property | Value |
| Hot Working Temperature (°C) | 1150 - 1000 |
| Annealing Temperature (°C) | 1050 - 1100 |
| Welding Processes | GTAW, GMAW, SMAW |
| Post Weld Heat Treatment | Solution Annealing |
Steel Grade
ASTM A312 Uns S31254 is classified under the steel grade UNS S31254. It is also commonly referred to as 6% moly.
Application
The Super Duplex 2507 stainless steel pipe can be found in various industries and applications due to its exceptional corrosion resistance, strength, and durability. Some common applications include:
Offshore and marine environments
Chemical processing plants
Desalination plants
Oil and gas industry
Pulp and paper industry
Heat exchangers
Possible Alternative Grades
While ASTM A312 Uns S31254 is highly regarded for its performance, there are some alternative grades that can be considered for certain applications. These include:
SAF 2507 (UNS S32750)
SAF 2707 HD (UNS S32707)
Alloy 255 (UNS S32550)
Zeron 100 (UNS S32760)
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