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Centerway steel specializes in the production of the stainless steel pipe and fittings, and large inventory of resources, Factory direct sales
Centerway steel specializes in the production of the stainless steel pipe and fittings, and large inventory of resources, Factory direct sales
Duplex 2507 (UNS S32750) is a super duplex stainless steel with 25% chromium, 4% molybdenum, and 7% nickel designed for demanding applications which require exceptional strength and corrosion resistance, such as chemical process, petrochemical, and seawater equipment.
Duplex Stainless Steels, also referred to as austeniticferritic stainless steels, are a family of grades having around equal proportions of austenite and ferrite.
These steels have a duplex microstructure which contributes to their high strength and high resistance to stress corrosion cracking.
Duplex steels offer high resistance to uniform and local corrosion because of their high content of nitrogen, chromium and molybdenum. Duplex stainless steels have good weldability.
Standards
ASTM/ASME A240 - Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
EURONORM 1.4410 - X2 Cr Ni MoN 25.7.4
AFNOR Z3 CN 25.06 Az
Chemical Analysis
|
Element |
Composition, % |
|
C |
≤0.030 |
|
Mn |
≤1.20 |
|
P |
≤0.035 |
|
S |
≤0.020 |
|
Si |
≤0.80 |
|
Cr |
24.0–26.0 |
|
Ni |
6.0–8.0 |
|
Mo |
3.0–5.0 |
|
N |
0.24–0.32 |
|
Cu |
≤0.50 |
Physical Properties
|
Interval |
Thermal |
°C |
Resistivity |
Thermal |
Specific |
Young |
Shear |
|
20-100 |
13 |
20 |
80 |
17 |
450 |
200 |
75 |
|
20-100 |
13 |
100 |
92 |
18 |
500 |
190 |
73 |
|
20-200 |
13.5 |
200 |
100 |
19 |
530 |
180 |
70 |
|
20-300 |
14 |
300 |
105 |
20 |
560 |
170 |
67 |
Product Forms & International Equivalent
|
Product Form |
Standard & Grade |
|
Forging |
ASTM A182 F53 |
|
Sheets, Plate |
ASTM A240 S32750 |
|
Seamless Tube |
ASTM A789 S32750 |
|
Welded Tube |
ASTM A789 S32750 |
|
Seamless Pipe |
ASTM A790 S32750 |
|
Welded Pipe |
ASTM A790 S32750 |
|
Bar & Shape |
ASTM A276 S32750 |
|
Billet & Bar |
ASTM A314 S32750 |
|
Sanitary Tubing |
ASTM A270 S32750 |
|
Bar & Shape |
ASTM A479 S32750 |
|
Pipe Fitting |
ASTM A815 WPS32750 |
|
Forging |
EN 10222-5 1.4410 |
|
Flat Product |
EN 10028-7 1.4410 |
|
Bar |
EN 10272 1.4410 |
|
Seamless Tube |
EN 10216-5 1.4410 |
|
Welded Tube |
EN 10296-2 1.4410 |
|
Seamless Tube |
EN 10297-2 1.4410 |
Processing
Hot Forming
2507 should be hot worked between 1875 F and 2250 F. This should be followed by a solution anneal at 1925F minimum and a rapid air or water quench.
Cold Forming
Most of the common stainless steel forming methods can be used for cold working 2507. The alloy has a higher yield strength and lower ductility than the austenitic steels so fabricators may find that higher forming forces, increased radius of bending, and increased allowance for springback are necessary. Deep drawing, stretch forming, and similar processes are more difficult to perform on 2507 than on an austenitic stainless steel. When forming requires more than 10% cold deformation, a solution anneal and quench are recommended.
Heat Treatment
2507 should be solution annealed and quenched after either hot or cold forming. Solution annealing should be done at a minimum of 1925 F. Annealing should be followed immediately by a rapid air or water quench. To obtain maximum corrosion resistance, heat treated products should be pickled and rinsed.
