SAF 2507, is a 25Cr duplex (ferritic-austenitic) stainless steel. The nominal chemical composition of SAF 2507 is 25% chromium, 7% nickel, 4% molybdenum and other alloying elements such as nitrogen and manganese.[1] The UNS designation for SAF 2507 is S32750 and the EN steel no. is 1.4410.
Typical properties of SAF 2507 duplex stainless steel are:
excellent resistance to stress corrosion cracking in chloride-bearing environments
excellent resistance to pitting corrosion and crevice corrosion
high resistance to general corrosion
very high mechanical strength
physical properties that offer design advantages
high resistance to erosion corrosion and corrosion fatigue
good weldability
Chemical Composition
Density | Test Method | Test Lab | Result | Reach the standard | |
Apparent Density (g/cm3) | ASTM B212 | AMCP Lab | 4.30 | YES | |
Tap Density (g/cm3) | ASTM B527 | AMCP Lab | 4.78 | YES | |
Chemical Composition (wt%) | Test Method | Test Lab | Expected Result | Tested Results | Reach the standard |
Carbon (C) | C/S Analyzer | AMCP Lab | ≤0.03 | 0.0095 | YES |
Chromium (Cr) | ICP-AES | AMCP Lab | 24.00-26.00 | 24.78 | YES |
Nickel (Ni) | ICP-AES | AMCP Lab | 6.00-8.00 | 6.99 | YES |
Molybdenum (Mo) | ICP-AES | AMCP Lab | 3.00-5.00 | 4.05 | YES |
Nitrogen (N) | O/N/H Analyzer | AMCP Lab | 0.24-0.32 | 0.27 | YES |
Iron (Fe) | ICP-AES | AMCP Lab | Balance | Balance | YES |
Silicon (Si) | ICP-AES | AMCP Lab | ≤0.80 | 0.27 | YES |
Manganese (Mn) | ICP-AES | AMCP Lab | ≤1.20 | 0.66 | YES |
Sulphur (S) | ICP-AES | AMCP Lab | ≤0.020 | 0.0051 | YES |
Phosphorus (P) | ICP-AES | AMCP Lab | ≤0.035 | 0.0042 | YES |
Copper (Cu) | ICP-AES | AMCP Lab | ≤0.50 | 0.022 | YES |
Oxygen (O) | O/N/H Analyzer | AMCP Lab | -- | 0.029 | YES |
Duplex Stainless Steel Description by ISSF
Duplex Stainless steels have a structure of half ferrite and half austenite, which means this kind of steel has a body centered cubic crystallographic structure and a face centered cubic crystallographic structure. To achieve this, elements which stabilize the ferrite phase (Cr, Mo, Si, W...) are balanced by elements which stabilize the austenite phase (Ni, N, Mn...). The ferrite/ austenite ratio depends not only on the alloying elements but also on heat treatments.
Duplex stainless steels show high corrosion resistance in a variety of environments like oxidizing industrial solutions, sulphuric acid containing solutions, organic acids, diluted mineral acids and hot alkaline solutions due to the high contents of Cr, Mo and N.
They show an exceptional combination of high strength and good corrosion resistance (Figure 3.1), making it possible to design lighter components and consequentially to decrease the materials and manufacturing costs. This led to the use of duplex stainless steel in applications such as oil and gas, reactors and tanks in the chemical industry, water treatment equipment, desalination plants and heat exchangers.
”Duplex Stainless Steel” by International Stainless Steel Forum
Well-Proportioned PSD
High Sphericity
Low Oxygen Content
Cost Effective
