Alloy SAF 2507 UNS S32750 is a super duplex stainless stee 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.
Super duplex grades have enhanced pitting and crevice corrosion resistance when compared with 300-series austenitic stainless steel 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.
Usage of Duplex 2507 should be limited to applications below 6000 F (3160 C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy 2507.The high chromium, molybdenum, and nitrogen levels provide excellent resistance to pitting, crevice, and general corrosion.the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking.
Duplex 2507 possesses excellent mechanical properties. Often a light gauge of 2507 material can be used to achieve the same design strength of a thicker nickel alloy. The resulting saving in weight can reduce the overall cost of fabrication.
•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
General Properties
Application
Standards
Chemical Composition
Resistance to Corrosion
Physical Properties
Mechanical Properties
Welding
Processing
ASTM A789/A789M
ASTM A 790/A 790M
Duplex Stainless Steel Pipe
Austenitic-Ferritic Stainless Steel Pipe
Super-Duplex Stainless Steels and their characteristics
2507 S32750(1.4410) Duplex Steel
S32205 S31803(1.4462) Duplex Steel
S32304(1.4362) Duplex Steel
Compared with the ferritic stainless steel, duplex stainless steel vulnerable
Compared with the austenitic stainless steel, duplex stainless steel strengths and vulnerable
Product Information for 2507 Super Duplex stainless steel pipe
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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 |
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 |
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 |
*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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