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2507 Stainless Steel

2507 Stainless Steel (UNS S32750), commonly referred to as Super Duplex 2507, is a high-alloy duplex stainless steel known for exceptional strength, corrosion resistance, and durability in harsh environments. With 25% chromium, 4% molybdenum, and 7% nickel, it demonstrates superior resistance to chloride pitting, crevice corrosion, and stress corrosion cracking, making it suitable for marine, chemical, and oil & gas applications. However, it’s best used below 600°F (316°C) to avoid toughness reduction due to prolonged elevated temperatures.

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Chemical Composition of 2507 Stainless Steel

Element	Composition (%)
Chromium (Cr)	24.0 – 26.0
Nickel (Ni)	6.0 – 8.0
Molybdenum (Mo)	3.0 – 5.0
Carbon (C)	≤ 0.03
Nitrogen (N)	0.24 – 0.32
Manganese (Mn)	≤ 1.20
Silicon (Si)	≤ 0.80
Phosphorus (P)	≤ 0.035
Sulfur (S)	≤ 0.020
Iron (Fe)	Balance

Technical Specifications of 2507 Stainless Steel

Physical Properties

Property	Metric	Imperial
Density	7.8 g/cm³	0.281 lb/in³
Elastic Modulus	200 GPa	29 x 10⁶ psi
Thermal Conductivity (at 100°C)	15 W/m·K	8.7 BTU/hr·ft·°F
Coefficient of Thermal Expansion	12.5 µm/m°C	6.9 x 10⁻⁶ in/in°F
Specific Heat	460 J/kg·K	0.110 BTU/lb·°F
Electrical Resistivity	0.78 µΩ·m	30.7 µΩ·in

Mechanical Properties

Property	Metric (MPa)	Imperial (ksi)
Tensile Strength	800 min.	116 min.
Yield Strength (0.2% offset)	550 min.	80 min.
Elongation (%)	15 min.	–
Hardness (Rockwell)	≤ 32 HRc	–

Thermal Properties

Property	Metric	Imperial
Thermal Conductivity	15 W/m·K at 100°C	8.7 BTU/hr·ft·°F
Coefficient of Thermal Expansion	12.5 µm/m°C	6.9 x 10⁻⁶ in/in°F
Melting Point	Approximately 1350°C	Approximately 2462°F

Electrical Properties

Property	Metric	Imperial
Electrical Resistivity	0.78 µΩ·m	30.7 µΩ·in

Product Specifications by Solitaire Steel & Engineering LLP

Product Type	Standards	Sizes	Types	Applications
Sheets & Plates	ASTM A240	Thickness: 3/16″ to 3″	Hot Rolled, Cold Rolled	Marine, chemical, oil & gas industries
Pipes & Tubes	ASTM A790, A789	Diameter: 6mm – 1200mm	Seamless, Welded	Seawater systems, chemical processing
Bars	ASTM A276	Diameter: up to 100mm	Round, Square, Hex	Fasteners, shafts, structural parts
Angles, Channels, Beams	ASTM A484	Custom sizes available	L-Angles, U-Channels, I-Beams	Structural applications in construction
Fittings	ASTM A815	Size: 1/2″ – 72″	Buttweld, Socket Weld	Process piping, marine, oil & gas

Processing and Fabrication Properties of 2507 Stainless Steel

Forming: Suitable for standard stainless steel forming techniques. Higher force is required due to high strength; cold forming needs additional measures to prevent work hardening.
Welding: Standard welding processes (SMAW, GTAW, PAW, FCW, and SAW) are suitable. Avoid high interpass temperatures to prevent structural distortion.
Heat Treatment:
- Annealing: Performed at 1040-1120°C, followed by rapid air or water quenching.
- Hardening: Achievable through work hardening rather than thermal treatment.
Machinability: Similar to austenitic stainless grades but requires more cutting force. Use of rigid tooling and reduced feed rates is recommended.

Applications of 2507 Stainless Steel

2507 Stainless Steel is well-suited for industries requiring high durability and resistance to harsh environments:

Oil & Gas: Offshore platforms, pipelines, and storage tanks.
Chemical Processing: Heat exchangers, vessels, and chemical piping.
Marine: Desalination equipment, seawater applications, shipbuilding.
Pulp & Paper: Digesters and bleaching equipment exposed to acidic conditions.
Power Generation: Flue gas desulfurization units, scrubber systems, absorber towers.