Stainless pipe fitting,stainless fitting,duplex stainless,31803,32750,32760,we are one of largest sour service stainless fitting supplier according to ISO 10156.
Duplex stainless steel alloys have ferritic/austenitic properties which give these materials superior strength and excellent resistance to oxidation. While the duplex grade family includes a wide range of specific formulations, Duplex S31803 (2205) and Super Duplex S32750 (2507) stainless steels are two of the most common. These stainless steel products are extremely versatile and have many applications in the oil and gas, petrochemical and chemical processing industries.
S31803 and S32750 Performance
Duplex S31803, also known as Stainless Steel Grade 2205, is a standardised formulation that conforms to UNS specifications. Its temperature range is typically specified as -50° to 300° C (-58° to 572° F), outside of which its performance characteristics degrade. In particular, Duplex S31803 micro-components suffer precipitation with prolonged exposure to high temperatures, and ductility suffers when immersed in extremely cold environments.
Its general capabilities include:
- Excellent oxidation resistance
- Outstanding performance in marine/sea water environments
- Low thermal expansion coefficients
- High heat conductivity
Super Duplex S32750 (2507) is a variant stainless steel alloy used primarily in the oil and gas industry, particularly for offshore platforms, heat exchangers, structural and architectural components. In addition to very high tensile and yield strengths, Super Duplex S32750 is highly resistant to stress corrosion cracking, pitting and is highly weldable and versatile.
For more information on the performance characteristics of duplex stainless steel products, or for any other enquiries, please contact a member of the Ram Alloys team. We have over 100 years of combined industry experience and can answer any questions you may have about steel alloys and their grades.
Duplex Chemical Composition
UNS: S31803
| Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulpher (S) | Silicon (Si) | Chrome (Cr) | Nickel (Ni) | Nitrogen (N) | Molybdenum(Mo) | |
|---|---|---|---|---|---|---|---|---|---|
| Min | 21.0 | 4.5 | 0.08 | 2.5 | |||||
| Max | 0.030 | 2 | 0.030 | 0.020 | 1.00 | 23.0 | 6.5 | 0.20 | 3.5 |
Duplex Mechanical Composition
UNS: S31803
| Grade | UNS Number | Tensile Min (psi) | Yield Min (psi) | Elongation Min % | Reductions Min % | Hardness BHN |
|---|---|---|---|---|---|---|
| Duplex | S31803 | 90,000 | 65,000 | 25 | 50 | 290 Max |
Super Duplex Chemical Composition
UNS: S32750
| Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulpher (S) | Silicon (Si) | Chrome (Cr) | Nickel (Ni) | Nitrogen (N) | Molybdenum (Mo) | Copper (Cu) | |
|---|---|---|---|---|---|---|---|---|---|---|
| Min | 24.0 | 6.0 | 0.24 | 3.0 | ||||||
| Max | 0.030 | 1.20 | 0.035 | 0.020 | 0.80 | 26.0 | 8.0 | 0.32 | 5.0 | 0.50 |
Super Duplex Mechanical Composition
UNS: S32750
| Grade | UNS Number | Tensile Min (psi) | Yield Min (psi) | Elongation Min % | Reductions Min % | Hardness BHN |
|---|---|---|---|---|---|---|
| Super Duplex | S32750 | |||||
| Less or Equal To 2″ | 116,000 | 80,000 | 15 | * | 310 Max | |
| Greater Than 2″ | 110,000 | 75,000 | 15 | * | 310 Max |