•High resistance to
chloride stress corrosion cracking•High Strength
•Superior resistance to chloride pitting and
crevice corrosion•Good general corrosion resistance
•Suggested for applications up to 6000 F
•Low rate of thermal expansion
•Combination of properties given by austenitic and ferritic
structure
•Good weldability and workability
Super Duplex Applications:
- Heat exchangers, tubes and pipes for production and handling of gas and oil,
- Heat exchangers and pipes in desalination plants,
- Mechanical and structural components,
- Power industry FGD systems,
- Pipes in process industries handling solutions containing
chlorides,
- Utility and industrial systems, rotors, fans, shafts and press
rolls where the high corrosion fatigue strength can be utilized,
- Cargo tanks, vessels, piping and welding consumables for chemical
tankers.
- High-strength, highly resistant wiring. Product Information for 2507 Super Duplex stainless steel pipe
| Sizes | | Standard Tolerances |
| Products | OD | Wall | Lengths and/or coils | Grades | OD | Wall | Lengths |
| Pressure &Corrosion Tubing Meets or exceeds requirements forwelded Specification: ASTM-A789 | 1/16" (1.59 mm) to 4" (101.6 mm) Metric sizes available | 0.010" (0.25 mm) to 0.220" (5.59 mm) | Random or cut lengths up to 40' (12.2 m) Coils to 1-1/2" OD | Super Duplex 2507 | <1-1/2" (38.1 mm) ±0.005" (0.13 mm) 1-1/2" (38.1 mm) to 3" (76.2 mm) ±0.010" (0.25 mm) 3-1/2" (88.9 mm) to 4" (101.6 mm) ±0.015" (0.38 mm) | ±10% | Randoms up to +2" (50.8 mm) Cuts +1/8" (3 mm) -0" Coils to 80,000' (24,384 m) |
| Subsea Umbilical Tubing Specifications: ASTM-A789 and ASTM-A790 | 3/8" (9.53 mm) to 1-1/2" (38.1 mm) | 0.039" (0.99 mm) to 0.125" (3.18 mm) | Cut lengths to 60' (18.3 m) Coils to 1-1/2" OD* | Super Duplex 2507 | ±0.005" (0.127 mm) | ±10% | Coils to 80,000' (24,384 m) |
Physical Properties of Super Duplex 2507 Alloys in the Annealed Condition at -20°F to +100°F | | | Tensile Strength | Yield Strength | | | | | | |
| Alloy | UNS | Spec. | psi | MPa | ksi | psi | MPa | ksi | Elongation in 2 in. (min.) % | Grain Size Req. | Max. Hardness | Modulus of Elasticity (x106 psi) | Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) | Thermal Conductivity (BTU-in/ ft2-h-°F) |
| SuperDuplex2507 | S32950 | A789,A790 | 100,000 | 690 | 100 | 70,000 | 485 | 70 | 20 | — | 30.5 Rc | — | — | — |
| Super Duplex 2507 | S32750 | A789, A790 | 116,000 | 800 | 116 | 80,000 | 550 | 80 | 15 | — | 32 Rc | 27.5 | 7.2 | 98 |
Composition of Super Duplex 2507 stainless steel tube| Grade | Super Duplex 2507 |
| UNS Designation | S32750 |
| 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 | — |
|Super Duplex 2507 Product Range| Alloy | UNS Designation | Werkstoff NR. | Specifications* |
| Super Duplex 2507 | S32750 | 1.4410 | A/SA789, A/SA790
|
Standard:
ASTM/ASME A240 -UNS S32750
EURONORM: 1.4410-X2 CrNi MoN 25.7.4
AFNOR:23CN 25.06Az
Description:
Super Duplex Stainless Steel is a highly alloyed, good performance
duplex steel with a pitting resistance. Super duplex offers good
resistance to pitting and crevice corrosion.Super duplex is suited
for use in aggressive environments. It has good resistance to
stress corrosion cracking in chloride and sour environments and has
good resistance to erosion corrosion and corrosion fatigue.
Application:
Oil and gas industry equipment.
Offshore platforms, heat exchangers,process and service water
systems, fire-fighting systems, injection and ballast water system.
Chemical process industries, heat exchangers, vessels, and piping.
Desalination plants, high pressure RO-plant and seawater piping.
Mechanical and structural components, high strength,
corrosion-resistant parts.
power industry FGD systems, utility and idustrial scrubber systems,
absorber towers, ducting, and piping.
Chemical composition%
| C | Cr | Ni | Mo | N | Others |
| 0.020 | 25 | 7 | 4.0 | 27 | S=0.001 |
| Pren=(Cr%)+3.3(Mo%)+16(N%) not less than 40 |
Mechanical Performance:
| Ultimate Tensile Strength, Ksi | 116min |
| 0.2%Offset Yield Strength 0.2%,Ksi | 80min |
| 0.1%Offset Yield Strength 0.2%,Ksi | 91min |
| Elongation in 2 inches, % | 15 min |
| Hardness Rockwell C | 32 max |
| Impact Energy, ft.-lbs. | 74min |
Low Temperature Impact Properties:
| Temperature 0F | RT | 34 | -4 | -40 |
| Ft -lbs | 162 | 162 | 155 | 140 |
| Temperature 0F | -76 | -112 | -148 | -320 |
| Ft -lbs | 110 | 44 | 30 | 7 |
Elevated temperature Tensile Properties:
| Temperature 0F | 68 | 212 | 302 | 392 | 482 |
| 0.2%Offset Yield Strength,Ksi | 80 | 65 | 61 | 58 | 55 |
| Ultimate Tensile Strength, Ksi | 116 | 101 | 98 | 95 | 94 |
Processing:
Hot forming
2507 should be hot worked between 18750F and 22500F. This should be
followed by a solution anneal at 19250F 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 austentic 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 hot or cold
forming solution annealing should be done at a minimum of 19250F.
(1025-1125 centigrade) 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.
Welding:
2507 possesses good weldability and can be joined to itself or
other materials by shielded metal arc welding, gas tungsten arc
welding, plasma arc welding, flux cored wire or submerged arc
welding. 2507/P100 filler metal is suggested when welding 2507
because it will produce the appropriate duplex weld structure.
