Duplex Alloy 2507 UNS S32750
Duplex Alloy 2507 is a super duplex stainless steel with excellent resistance to chloride stress corrosion cracking, high thermal conductivity, and a low coefficient of thermal expansion.
Strip, Coil, Foil, Wire, ASTM A240
Oil and gas industry equipment, off-shore platforms, heat exchangers, chemical process industry, vessels, piping, desalination plants
Duplex Alloy 2507 is a super duplex stainless steel with 25% chromium, 4% molybdenum and 7% nickel. It 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. The impact strength is also high. Duplex Alloy 2507 is not recommended for applications which require long exposures to temperatures above 570 °F because of the risk of a reduction in toughness.
Carbon: 0.03 max
Manganese: 1.2 max
Phosphorus: 0.035 max
Sulfur: 0.020 max
Silicon: 0.80 max
Chromium: 24.00 - 26.00
Nickel: 6.00 - 8.00
Molybdenum: 3.00 - 5.00
Nitrogen: 0.24 - 0.32
Copper: 0.50 max
Density: 0.28 lbs/in3 7.75 g/cm3
Thermal Conductivity: BTU-ft/hr/ft2/°F (W/m-° K):
At 68 - 212 °F (20 - 100 °C): 9.0 (17.0)
Mean Coefficient of Thermal Expansion: in/in/°F (µm/m•K):
32 - 212 °F: 7.2 x 10·6 (13)
Modulus of Elasticity: ksi (MPa):
29 x 103 (200 x 103) in tension
Melting Point: 2570 - 2660 °F (1410 - 1460 °C)
Coil - Strip, Foil, Ribbon Wire - Profile, Round, Flat, Square
Mechanical Properties at Room Temperature
Ultimate Tensile Strength: 116 KSI min (800 MPa min)
Yield Strength: (0.2 % offset) 80 KSI min (551 MPa min)
Elongation: 15% min
Hardness: Rc32 max
Duplex Alloy 2507 can be cold rolled to various tempers. Contact Ulbrich Technical Service for additional information.
Refer to NACE (National Association of Corrosion Engineers) for recommendations.
# 1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
# 2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process. # 2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA- Bright annealed cold rolled and bright annealed
#CBA- Course bright annealed cold rolled matte finish and bright anneal
#2 - Cold Rolled
# 2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part. Polished - Various grit finish for specific polish finished requirements.
* Not All Finishes are Available for All Alloys - Consult Sales for Applicable Finishes.
XC - Extra clean bright annealed or bright annealed and cold rolled Grease - Ultra-bright finish (for decorative applications) Soap - Soap is not removed from tempered wire to act as a lubricant.
*Contact Ulbrich Wire with special finish requests.
Duplex Alloy 2507 cannot be hardened by heat treatment.
For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".
Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.