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Alloy SAF 2507 (UNS S32750) is a super duplex stainless steel pipe 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. The steel has excellent resistance to chloride stress corrosion cracking, high thermal conductivity, and a low coefficient of thermal expansion. The high chromium, molybdenum, and nitrogen levels provide excellent resistance to pitting, crevice, and general corrosion.
“Super” duplex grades have enhanced pitting and crevice corrosion resistance when compared with 300-series austenitic stainless steels or conventional duplex alloys. This can be attributed to the enhanced levels of chromium, molybdenum and nitrogen found in these materials. Alloy 2507 is the most common “super” duplex grade.
General Properties
Application
Standards
Chemical Composition
Resistance to Corrosion
Physical Properties
Mechanical Properties
Welding
Processing
S32750 Stainless Steel Tube | S32750 Stainless Steel Pipe
304 | 304L | 304H| 316/316L| 316Ti| 317L| 321/321H | 309S | 310S | 347/347H| S32205/S31803| S32750| 904L
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Sizes |
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Standard Tolerances |
| Products |
OD |
Wall |
Lengths and/or coils |
Grades |
OD |
Wall |
Lengths |
| Pressure & Corrosion Tubing
Meets or exceeds requirements for welded
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
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Tensile Strength |
Yield Strength |
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| Alloy |
UNS Designation |
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) |
| Super Duplex 2507 |
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 |
| 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 |
*Note: The specifications noted including ASTM, ASME, or other applicable authorities are correct at the time of publication. Other specifications may apply for use of these materials in different applications.
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