Super Duplex S32750 pipes have gained popularity across various industries for their remarkable properties and exceptional performance under extreme conditions. These pipes are made of a high-alloy material engineered to offer superior strength, corrosion resistance, and durability. In this blog post, we will explore the composition, physical, and mechanical properties of S32750 Super Duplex pipes. We will also discuss the various uses of these pipes, heat treatment procedures, and their corrosion resistance. So let’s get started!
What are Super Duplex S32750 Pipes?
ASTM A790 UNS S32750 pipe is made of stainless steel alloy that offer: higher strength than conventional austenitic stainless steels, superior corrosion resistance compared to most the other duplex alloys, good weldability and formability, and a combination of both improved yield strength and tensile strength. This makes them ideal for applications in aggressive chloride-bearing environments and industries such as oil & gas production and chemical processing.
Composition of Super Duplex S32750 Pipes
Super Duplex stainless steel S32750 pipes are made up of a combination of austenitic and ferritic stainless steels, giving them unique properties. The composition of Super Duplex S32750 pipes includes 24-26% chromium, 6-8% nickel, 3% molybdenum, and 0.24-0.32% nitrogen. The addition of nitrogen in Super Duplex S32750 pipes offers improved corrosion resistance, while the high chromium and molybdenum content provides excellent corrosion resistance against a wide range of acids, alkalis and other corrosive chemicals.
| GRADE | SUPER DUPLEX 2507 |
|---|---|
| Carbon (C) Max. | 0.030 |
| Manganese (Mn) Max. | 1.20 |
| Phosphorous (P) Max. | 0.035 |
| Sulphur (S) Max. | 0.020 |
| Silicon (Si) Max. | 0.80 |
| Chromium (Cr) | 24.0–26.0 |
| Nickel (Ni) | 6.0–8.0 |
| Molybdenum (Mo) | 3.0–5.0 |
| Nitrogen (N) | 0.24–0.32 |
| Iron (Fe) | Bal. |
| Copper (Cu) | 0.50 |
| Other Elements | – |
Physical Properties of Super Duplex S32750 Pipes
The physical properties of S32750 Super Duplex pipes include high strength, high yield strength, and exceptional formability and weldability. These pipes have a 7.8 g/cm³ density and a melting point of 1350-1400°C. The thermal conductivity of these pipes is relatively low, which makes them suitable for high-temperature applications.
Mechanical Properties of Super Duplex S32750 Pipes
Stainless steel Super Duplex S32750 pipes exhibit exceptional mechanical properties, making them ideal for demanding applications. They offer high yield strength, tensile strength, and excellent toughness even at low temperatures. Some of the key mechanical properties of Super Duplex S32750 pipes include a minimum tensile strength of 795 MPa, a minimum yield strength of 550 MPa, and an elongation of 15%.
| TENSILE STRENGTH | YIELD STRENGTH | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ALLOY | UNS DESIGNATION | SPEC. | PSI | MPA | KSI | PSI | MPA | KSI | ELONGATION IN 2 IN. (MIN.) % | GRAIN SIZE REQ. | MAX. HARDNESS | MODULUS OF ELASTICITY (X106PSI) | MEAN COEFFICIENT OF THERMAL EXPANSION (IN./IN./°F X 10-6) | THERMAL CONDUCTIVITY (BTU-IN/ FT2-H-°F) |
| 2507 | S32950 | A789, A790 | 100,000 | 690 | 100 | 70,000 | 485 | 70 | 20 | – | 30.5 Rc | – | – | – |
| 2507 | S32750 | A789, A790 | 116,000 | 800 | 116 | 80,000 | 550 | 80 | 15 | – | 32 Rc | 27.5 | 7.2 | |
Super Duplex S32750 Pipes Equivalent
| ALLOY | UNS DESIGNATION | WERKSTOFF NR. | SPECIFICATIONS | AFNOR | GRADE | DIN | EN | SS |
|---|---|---|---|---|---|---|---|---|
| 2507 | S32750 | 1.4410 | A/SA789, A/SA790 | Z3 CN 25.06 Az | F53 | X 2 Cr Ni MoN 25.7.4 | 1.4410 | 2328 |
Uses of Super Duplex S32750 Pipes
Stainless Super Duplex pipes are widely used in various industries due to their exceptional properties. They are commonly used in chemical processing, seawater desalination plants, the oil and gas industry, pulp and paper mills, and in the manufacturing of heat exchangers, pressure vessels, and storage tanks. Their high corrosion resistance and excellent mechanical properties make them ideal for harsh and corrosive environments.
Heat Treatment of Super Duplex S32750 Pipes
Super Duplex S32750 pipes can be heat treated to improve their mechanical properties. The heat treatment procedure involves heating the pipes to a temperature range of 1020-1100°C, followed by water quenching. This process enhances the pipes’ strength, toughness, and resistance to fatigue.
Corrosion Resistance of Super Duplex S32750 Pipes
Super Duplex S32750 pipes exhibit excellent corrosion resistance, making them ideal for corrosive environments. They offer excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. These pipes are also chloride-resistant, making them suitable for seawater applications.
Conclusion:
Super Duplex S32750 pipes offer exceptional properties ideal for various industries. Their unique composition of austenitic and ferritic stainless steels provides them with high corrosion resistance, exceptional mechanical properties, and excellent formability and weldability. They are widely used in chemical processing, seawater desalination plants, the oil and gas industry, and pulp and paper mills. The exceptional mechanical properties, corrosion resistance, and heat treatment make these pipes versatile in harsh and corrosive environments. Therefore, if you want a pipe that can withstand extreme conditions, Super Duplex S32750 pipes are an excellent option.
A passionate metal industry expert and blogger. With over 5 years of experience in the field, Palak brings a wealth of knowledge and insight to her writing. Whether discussing the latest trends in the metal industry or sharing tips, she is dedicated to helping others succeed in the metal industry.
