Super Duplex 2507 Pipe

Super Duplex 2507 pipe (UNS S32750) is a premium ferritic-austenitic stainless steel engineered to outperform conventional duplex and austenitic grades in aggressive chloride, acidic, and high-pressure environments. With 25% chromium, 4% molybdenum, and 0.3% nitrogen, it delivers PREN ≥42 (Pitting Resistance Equivalent Number), yield strength up to 550 MPa, and unmatched resistance to stress corrosion cracking (SCC). Certified to ASTM A790 and NORSOK MDS D45, it is the go-to solution for offshore oil platforms, desalination plants, and chemical processing systems demanding 50+ years of service life.

Key Advantages

Unrivaled Corrosion Resistance

Resists pitting/crevice corrosion in seawater (Cl⁻ >30.000 ppm) and acidic media (pH 1–10).

Superior to 316L and 2205 in H₂S-saturated environments (NACE MR0175 compliant).

Extreme Mechanical Strength

Double the yield strength of 316L (550 MPa vs. 250 MPa), enabling thinner, lighter pipe designs.

Impact toughness ≥100 J at -40°C for Arctic applications.

Cost Efficiency

30–40% lifecycle cost savings vs. nickel alloys like Inconel 625.

Fabrication Flexibility

Weldable via TIG/SAW with ER2594 filler; cold-forming compatible (max 15% strain).

Global Standards & Grades

Region	Standard	Grade	Surface Finish
USA	ASTM A790	UNS S32750	Pickled & Polished (Ra ≤0.8 µm)
Europe	EN 10216-5	1.4410	Shot Blasted (Sa 3.0)
Middle East	NORSOK MDS D45	SAF 2507	Electropolished
Asia	JIS G3459	SUS 2507	Bright Annealed (BA)

Technical Specifications

Chemical Composition (wt%)

Cr	Ni	Mo	N	Mn	C	Fe
24–26%	6–8%	3–4.5%	0.24–0.35%	≤1.2%	≤0.03%	Balance

Mechanical Properties

Condition	Tensile Strength	Yield Strength	Elongation	Hardness (HV)	PREN
Solution Annealed	800–1.000 MPa	550 MPa (min.)	≥25%	290–320	≥42
Cold Worked	1.100 MPa (max.)	850 MPa (max.)	≥15%	350–400	N/A

Critical Applications

Oil & Gas

Subsea umbilicals, flowlines, and Christmas tree components (API 6A compliance).

Desalination

High-pressure RO (Reverse Osmosis) membranes, brine heaters.

Chemical Processing

Reactor vessels, heat exchangers handling sulfuric/nitric acids.

Marine Engineering

Seawater cooling systems, propeller shafts, and ballast water piping.

Energy

Geothermal well casings, flue gas scrubbers.

Fabrication Guidelines

Welding

Preheat not required; maintain interpass temp <150°C; use Ar/He shielding gas.

Heat Treatment

Solution anneal at 1.040–1.120°C followed by water quenching to avoid sigma phase.

Machining

Use carbide tools with high-speed lubrication (emulsion-free preferred).

Surface Protection

Passivate with HNO3/HF (ASTM A967 Method 3) for enhanced Cr₂O₃ layer formation.

Quality Assurance

Testing Protocols:

100% PMI (Positive Material Identification) via XRF.

Ferrite content verification (35–55% via Feritscope®).

IGC (Intergranular Corrosion) testing per ASTM A262 Practice C.

Certifications:

NORSOK, PED 2014/68/EU, ASME B31.3. DNV GL Offshore Standard.

Traceability:

Digital batch tracking with 3.1 Mill Certificates (EN 10204).

FAQs

Q1: How does Super Duplex 2507 compare to Duplex 2205?

A1: 2507 offers 25% higher strength, superior chloride resistance (PREN 42 vs. 35), and broader thermal stability (-40°C to 300°C).

Q2: Maximum operating temperature?

A2: 300°C (572°F) continuous; avoid prolonged exposure above 280°C to prevent embrittlement.

Q3: Is post-weld heat treatment necessary?

A3: Only for welded joints in H₂S service-anneal at 1.050°C to eliminate residual stresses.

Q4: Can it replace titanium in seawater systems?

A4: Yes-2507 matches Ti Grade 2's corrosion resistance at 1/3 the cost for temps <80°C.

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