In extreme environments where standard duplex steel (such as 2205) performs poorly, such as deep-sea operations, seawater desalination, or oil and gas wells containing hydrogen sulfide, the material faces extremely high risks of pitting and crevice corrosion.
For stockists serving the marine and energy industries, Super Duplex S32750 stainless steel is not only a high priced grade, but also a necessary defense against harsh working conditions and a key to high value-added orders.
Why is it called 'super'? (Defining "Super")
The reason why S32750 (SAF 2507) is called a "super duplex steel" lies in its significant improvement in pitting corrosion resistance equivalent number (PREN).
PREN formula: PREN=% Cr+3.3 *% Mo+16 *% N$
Definition criteria: The PREN value of standard duplex steel (2205) is usually around 34-35, while the PREN value of S32750 must be greater than 40.
To achieve this target, S32750 increases chromium (Cr) to 25%, molybdenum (Mo) to 4%, and nitrogen (N) to 0.3%. This high alloy ratio makes its resistance to localized corrosion comparable to or even surpassing expensive 6Mo austenitic stainless steel, but at a more cost-effective cost.
Conquering the ocean: resistant to pitting and crevice corrosion
In seawater environments, the concentration of chloride ions is extremely high. Once the temperature rises or the flow rate decreases (forming gaps), the passivation film on the surface of ordinary stainless steel will quickly rupture, forming pitting corrosion pits.
Critical pitting temperature (CPT): The CPT of S32750 typically exceeds 80 ° C, while 2205 is only around 50 ° C, and 316L is even lower than 20 ° C. This means that in hot seawater or process fluid cooling systems, S32750 can provide extremely high safety margins.
Anti crevice corrosion: At the flange connection surface or gasket, S32750 can effectively resist crevice corrosion caused by oxygen deficient environment, which is crucial for submarine pipelines that are submerged in seawater for a long time.
Strength and Lightweight
In addition to corrosion resistance, the yield strength of S32750 is over 550 MPa, which is three times that of 316L.
In weight sensitive applications such as offshore oil platforms, the use of S32750 allows designers to significantly reduce pipeline wall thickness. This not only reduces material procurement costs, but also significantly reduces the overall structural load and construction costs of the platform.
SMLSCO's special material supply capability
For stockists, the biggest challenge in purchasing S32750 is not price, but rather "compliance" and "completeness". Marine engineering projects typically require extremely strict certifications, and pipe fittings are often difficult to purchase in stock.
SMLSCO integrates the global supply chain and provides seamless special material services for high-end inventory providers:
NORSOK M-650 certification: This is the "passport" to enter high-end oil and gas projects in the Norwegian North Sea and globally. The S32750 pipes and fittings we supply can be traced back to manufacturers who comply with NORSOK M-650 standards.
Pipe fittings matching: We not only provide S32750 seamless pipes, but also synchronously supply matching flanges and fittings.
One stop solution: solve the pain point of "pipes arrive, flanges have to wait for two months" in special material orders, ensuring timely delivery of the entire order.
FAQ
Q1: What is the difference between S32750 and S32760?
A: Both are super duplex steels with similar performance. The main difference is that S32760 additionally adds a small amount of tungsten (W) and copper (Cu). In most oil and gas and offshore applications, the two are interchangeable, but specific requirements must comply with the AML (Approved Vendor List) regulations of the project. SMLSCO can provide corresponding grades according to your project requirements.
Q2: What testing reports can SMLSCO provide when purchasing S32750?
A: In addition to the standard warranty certificate, we can provide corrosion test reports (to verify pitting performance), ferrite content tests, and metallographic structure photos as required to ensure that the material has no harmful phase precipitation.
The Super Dual Phase S32750 is the pinnacle of materials science in balancing strength and corrosion resistance. For projects where 2205 cannot be used due to harsh working conditions, S32750 is the most economical and reliable solution.
SMLSCO is committed to helping stockists solve the difficulties of special material procurement and ensuring that your supply chain meets the highest international standards.
SMLSCO, Steel in Stock. Delivered on the Dot.
Consultation on S32750/S32760 inventory and certification details: info@smlspipestock.com
In extreme environments where standard duplex steel (such as 2205) performs poorly, such as deep-sea operations, seawater desalination, or oil and gas wells containing hydrogen sulfide, the material faces extremely high risks of pitting and crevice corrosion.
For stockists serving the marine and energy industries, Super Duplex S32750 stainless steel is not only a high priced grade, but also a necessary defense against harsh working conditions and a key to high value-added orders.
Why is it called 'super'? (Defining "Super")
The reason why S32750 (SAF 2507) is called a "super duplex steel" lies in its significant improvement in pitting corrosion resistance equivalent number (PREN).
PREN formula: PREN=% Cr+3.3 *% Mo+16 *% N$
Definition criteria: The PREN value of standard duplex steel (2205) is usually around 34-35, while the PREN value of S32750 must be greater than 40.
To achieve this target, S32750 increases chromium (Cr) to 25%, molybdenum (Mo) to 4%, and nitrogen (N) to 0.3%. This high alloy ratio makes its resistance to localized corrosion comparable to or even surpassing expensive 6Mo austenitic stainless steel, but at a more cost-effective cost.
Conquering the ocean: resistant to pitting and crevice corrosion
In seawater environments, the concentration of chloride ions is extremely high. Once the temperature rises or the flow rate decreases (forming gaps), the passivation film on the surface of ordinary stainless steel will quickly rupture, forming pitting corrosion pits.
Critical pitting temperature (CPT): The CPT of S32750 typically exceeds 80 ° C, while 2205 is only around 50 ° C, and 316L is even lower than 20 ° C. This means that in hot seawater or process fluid cooling systems, S32750 can provide extremely high safety margins.
Anti crevice corrosion: At the flange connection surface or gasket, S32750 can effectively resist crevice corrosion caused by oxygen deficient environment, which is crucial for submarine pipelines that are submerged in seawater for a long time.
Strength and Lightweight
In addition to corrosion resistance, the yield strength of S32750 is over 550 MPa, which is three times that of 316L.
In weight sensitive applications such as offshore oil platforms, the use of S32750 allows designers to significantly reduce pipeline wall thickness. This not only reduces material procurement costs, but also significantly reduces the overall structural load and construction costs of the platform.
SMLSCO's special material supply capability
For stockists, the biggest challenge in purchasing S32750 is not price, but rather "compliance" and "completeness". Marine engineering projects typically require extremely strict certifications, and pipe fittings are often difficult to purchase in stock.
SMLSCO integrates the global supply chain and provides seamless special material services for high-end inventory providers:
NORSOK M-650 certification: This is the "passport" to enter high-end oil and gas projects in the Norwegian North Sea and globally. The S32750 pipes and fittings we supply can be traced back to manufacturers who comply with NORSOK M-650 standards.
Pipe fittings matching: We not only provide S32750 seamless pipes, but also synchronously supply matching flanges and fittings.
One stop solution: solve the pain point of "pipes arrive, flanges have to wait for two months" in special material orders, ensuring timely delivery of the entire order.
FAQ
Q1: What is the difference between S32750 and S32760?
A: Both are super duplex steels with similar performance. The main difference is that S32760 additionally adds a small amount of tungsten (W) and copper (Cu). In most oil and gas and offshore applications, the two are interchangeable, but specific requirements must comply with the AML (Approved Vendor List) regulations of the project. SMLSCO can provide corresponding grades according to your project requirements.
Q2: What testing reports can SMLSCO provide when purchasing S32750?
A: In addition to the standard warranty certificate, we can provide corrosion test reports (to verify pitting performance), ferrite content tests, and metallographic structure photos as required to ensure that the material has no harmful phase precipitation.
The Super Dual Phase S32750 is the pinnacle of materials science in balancing strength and corrosion resistance. For projects where 2205 cannot be used due to harsh working conditions, S32750 is the most economical and reliable solution.
SMLSCO is committed to helping stockists solve the difficulties of special material procurement and ensuring that your supply chain meets the highest international standards.
SMLSCO, Steel in Stock. Delivered on the Dot.
Consultation on S32750/S32760 inventory and certification details: info@smlspipestock.com
