Super Duplex 2507 Pipe & Tube

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Product Overview

Om Export India Pvt Ltd is a premier manufacturer, stockist, and global supplier of high-integrity Super Duplex 2507 Pipes and Tubes (UNS S32750 / Werkstoff 1.4410 / UNS S32760). Super Duplex 2507 is a 25% Chromium, 7% Nickel, 4% Molybdenum, and 0.28% Nitrogen alloyed austenitic-ferritic stainless steel engineered specifically for highly aggressive chloride environments requiring exceptional mechanical strength and corrosion resistance beyond standard duplex grades.

With a Pitting Resistance Equivalent Number (PREN) exceeding 42, Super Duplex 2507 provides outstanding resistance to pitting, crevice corrosion, erosion-corrosion, and chloride-induced stress corrosion cracking (SCC). Our seamless and welded pipes meet stringent international oil and gas specifications including ASTM A790, ASME SA790, ASTM A789, and NORSOK M-650. Designed for severe offshore, subsea, chemical, and desalination applications, our 25Cr Super Duplex inventory combines high yield strength (minimum 550 MPa / 80 ksi) with tight dimensional tolerances and controlled 50/50 phase balance.

Pitting & Crevice Resistance: PREN ≥ 42 ensures maximum protection in seawater, brine, and high-chloride acidic process streams.
High Mechanical Load Capability: Minimum yield strength of 550 MPa (80 ksi) allows significant wall-thinning and overall weight reduction in piping systems.
Stress Corrosion Cracking Immunity: Superior resistance to sulfide stress corrosion cracking in sour (H2S) oilfield services.

Key Features

High Pitting Resistance: High PREN (≥ 42) ensures resistance against pitting and crevice corrosion in hot seawater.
Mechanical Strength: High yield strength (≥ 550 MPa) allows design engineers to reduce pipe wall thickness and total weight.
Stress Corrosion Resistance: Excellent resistance to chloride- and sulfide-induced stress corrosion cracking in sour environments.
Erosion & Cavitation Resistance: High surface hardness prevents localized erosion attack in high-velocity seawater piping.
Phase Balance Control: Solution annealed processing guarantees a 50/50 austenitic-ferritic phase matrix.
Thermal Efficiency: Lower coefficient of thermal expansion compared to standard austenitic stainless steels, reducing thermal stress.

Product Specifications

Specification Parameter	Standard Specification / Technical Value
Seamless Pipe Size Range	1/8" NB to 12" NB (Outer Diameter: 4.0 mm to 219.0 mm OD)
Welded & EFW Size Range	1/2" NB to 48" NB (Outer Diameter: 5.0 mm to 1219.2 mm OD)
Wall Thickness & Schedules	SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, SCH XXS (0.35 mm to 20.0 mm WT)
Governing Standards	ASTM A790, ASME SA790, ASTM A789, ASME SA789, ASTM A928, EN 10216-5
Heat Treatment Condition	Solution Annealed at 1050°C – 1120°C (1920°F – 2050°F) followed by rapid water quenching
Standard Pipe Lengths	Single Random Length (SRL), Double Random Length (DRL), Custom Cut Lengths up to 12,000 mm
Surface Delivery Condition	Solution Annealed & Pickled (AP), Bright Annealed (BA), Polished (180 to 600 Grit), Descaled
End Configurations	Plain Square Cut End (PE), Beveled End (BE 30° / 37.5° per ASME B16.25), Threaded & Coupled

Dimensions & Sizes

Nominal Pipe Size (NPS)	Outside Diameter (OD mm / in.)	Wall Thickness (WT mm / in.)	Nominal Schedule	Weight (kg/m)	Weight (lb/ft)
1/2" NB	21.34 mm (0.840")	2.11 mm (0.083")	SCH 10S	1.02 kg/m	0.68 lb/ft
1/2" NB	21.34 mm (0.840")	2.77 mm (0.109")	SCH 40S	1.29 kg/m	0.85 lb/ft
1/2" NB	21.34 mm (0.840")	3.73 mm (0.147")	SCH 80S	1.65 kg/m	1.09 lb/ft
3/4" NB	26.67 mm (1.050")	2.11 mm (0.083")	SCH 10S	1.30 kg/m	0.87 lb/ft
3/4" NB	26.67 mm (1.050")	2.87 mm (0.113")	SCH 40S	1.71 kg/m	1.13 lb/ft
3/4" NB	26.67 mm (1.050")	3.91 mm (0.154")	SCH 80S	2.23 kg/m	1.48 lb/ft
1" NB	33.40 mm (1.315")	1.65 mm (0.065")	SCH 5S	1.31 kg/m	0.88 lb/ft
1" NB	33.40 mm (1.315")	2.77 mm (0.109")	SCH 10S	2.13 kg/m	1.43 lb/ft
1" NB	33.40 mm (1.315")	3.38 mm (0.133")	SCH 40S	2.54 kg/m	1.68 lb/ft
1" NB	33.40 mm (1.315")	4.55 mm (0.179")	SCH 80S	3.29 kg/m	2.17 lb/ft
1-1/4" NB	42.16 mm (1.660")	2.77 mm (0.109")	SCH 10S	2.73 kg/m	1.83 lb/ft
1-1/4" NB	42.16 mm (1.660")	3.56 mm (0.140")	SCH 40S	3.44 kg/m	2.31 lb/ft
1-1/2" NB	48.26 mm (1.900")	2.77 mm (0.109")	SCH 10S	3.16 kg/m	2.12 lb/ft
1-1/2" NB	48.26 mm (1.900")	3.68 mm (0.145")	SCH 40S	4.11 kg/m	2.72 lb/ft
1-1/2" NB	48.26 mm (1.900")	5.08 mm (0.200")	SCH 80S	5.49 kg/m	3.63 lb/ft
2" NB	60.33 mm (2.375")	2.77 mm (0.109")	SCH 10S	3.99 kg/m	2.64 lb/ft
2" NB	60.33 mm (2.375")	3.91 mm (0.154")	SCH 40S	5.52 kg/m	3.66 lb/ft
2" NB	60.33 mm (2.375")	5.54 mm (0.218")	SCH 80S	7.60 kg/m	5.03 lb/ft
2-1/2" NB	73.03 mm (2.875")	3.05 mm (0.120")	SCH 10S	5.35 kg/m	3.59 lb/ft
2-1/2" NB	73.03 mm (2.875")	5.16 mm (0.203")	SCH 40S	8.77 kg/m	5.89 lb/ft
3" NB	88.90 mm (3.500")	3.05 mm (0.120")	SCH 10S	6.56 kg/m	4.34 lb/ft
3" NB	88.90 mm (3.500")	5.49 mm (0.216")	SCH 40S	11.47 kg/m	7.58 lb/ft
4" NB	114.30 mm (4.500")	3.05 mm (0.120")	SCH 10S	8.50 kg/m	5.62 lb/ft
4" NB	114.30 mm (4.500")	6.02 mm (0.237")	SCH 40S	16.32 kg/m	10.80 lb/ft
6" NB	168.28 mm (6.625")	3.46 mm (0.134")	SCH 10S	14.04 kg/m	9.30 lb/ft
6" NB	168.28 mm (6.625")	7.11 mm (0.280")	SCH 40S	28.69 kg/m	18.99 lb/ft
8" NB	219.08 mm (8.625")	3.76 mm (0.148")	SCH 10S	20.27 kg/m	13.62 lb/ft
8" NB	219.08 mm (8.625")	8.18 mm (0.322")	SCH 40S	43.20 kg/m	28.55 lb/ft
10" NB	273.05 mm (10.750")	4.19 mm (0.165")	SCH 10S	28.22 kg/m	18.96 lb/ft
10" NB	273.05 mm (10.750")	9.27 mm (0.365")	SCH 40S	61.22 kg/m	41.14 lb/ft
12" NB	323.85 mm (12.750")	4.57 mm (0.180")	SCH 10S	36.54 kg/m	24.55 lb/ft
12" NB	323.85 mm (12.750")	9.53 mm (0.375")	SCH 40S	75.02 kg/m	50.41 lb/ft

Chemical Composition

Grade / Alloy	C (%) Max	Mn (%) Max	P (%) Max	S (%) Max	Si (%) Max	Cr (%)	Ni (%)	Mo (%)	N (%)	Cu (%) Max	Fe (%)
UNS S32750 (2507 / 1.4410)	0.030	1.20	0.035	0.020	0.80	24.0 – 26.0	6.0 – 8.0	3.0 – 5.0	0.24 – 0.32	0.50	Balance
UNS S32760 (F55 / 1.4501)	0.030	1.00	0.030	0.010	1.00	24.0 – 26.0	6.0 – 8.0	3.0 – 4.0	0.20 – 0.30	0.50 – 1.00	Balance (W: 0.5–1.0)

Mechanical Properties

Mechanical Property	Specified Limit (UNS S32750 / EN 1.4410)	Technical Value / Test Method
Tensile Strength (Min)	800 MPa (116 ksi / 116,000 psi)	ASTM A790 / ASTM A789 Requirement
Yield Strength (0.2% Offset, Min)	550 MPa (80 ksi / 80,000 psi)	ASTM A790 / ASTM A789 Requirement
Elongation in 2 in. / 50 mm (Min)	15% – 20% Min	ASTM A790 Specification
Hardness (Rockwell C / Brinell, Max)	32 HRC Max / 310 HBW Max	NACE MR0175 / ISO 15156 Compliance
Modulus of Elasticity	200 GPa (27.5 x 10⁶ psi)	Room Temperature Elasticity
Thermal Expansion Coefficient	13.0 x 10⁻⁶ /K (7.2 x 10⁻⁶ in/in/°F)	Mean Coefficient (20°C to 100°C)
Charpy V-Notch Impact Toughness	≥ 80 J at -40°C (-40°F)	ASTM A923 Method B / ISO 148-1

Standards & Specifications

Governing Organization	Standard Designation	Scope & Product Type
ASTM / ASME	ASTM A790 / ASME SA790	Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe (UNS S32750 / S32760)
ASTM / ASME	ASTM A789 / ASME SA789	Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
ASTM / ASME	ASTM A928 / ASME SA928	Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
European Standard (EN)	EN 10216-5 / EN 10217-7	Seamless and Welded Steel Tubes for Pressure Purposes (1.4410 / X2CrNiMoN 25.7.4)
German Standard (DIN)	DIN 17456 / DIN 17458	General and Pressure Purpose Stainless Steel Seamless Tubes (Werkstoff 1.4410 / 1.4501)
International Standard	ISO 15156 / NACE MR0175	Materials for use in H2S-containing environments in oil and gas production
Norwegian Standard	NORSOK M-650 / M-630	Qualification of manufacturers of special materials (MDS D51 / MDS D55)

Applications

Super Duplex 2507 stainless steel pipes and tubes are utilized across demanding offshore, chemical processing, and energy generation sectors:

Offshore Oil & Gas Platforms: Subsea flowlines, production manifolds, riser pipes, gas injection systems, and seawater deluge fire-protection systems.
Seawater Desalination Plants: High-pressure Reverse Osmosis (RO) brine lines, membrane pressure vessel headers, and seawater intake pipework.
Chemical & Petrochemical Processing: Nitric, phosphoric, and organic acid processing lines, process reboilers, and heat exchangers.
Flue Gas Desulfurization (FGD): Scrubber absorption towers, ductwork systems, and slurry recirculating piping exposed to high chlorides and sulfuric acid.
Marine & Subsea Engineering: Propeller shafting, subsea umbilical hydraulic tubing, and high-strength subsea control lines.
Pulp & Paper Bleach Plants: Bleaching equipment, chlorination towers, and drum washers requiring high pitting resistance.

Frequently Asked Questions

Q1: What is the main difference between Duplex 2205 and Super Duplex 2507?
Super Duplex 2507 contains higher concentrations of Chromium (25% vs. 22%), Nickel (7% vs. 5%), and Molybdenum (4% vs. 3%), as well as elevated Nitrogen. This elevates its Pitting Resistance Equivalent Number (PREN) to ≥42 compared to 2205’s PREN of ~35, providing superior resistance in hot seawater and severe acidic halide environments along with higher mechanical strength.

Q2: What is the maximum service temperature for Super Duplex 2507 piping?
Super Duplex 2507 is recommended for continuous operation within a temperature window of -50°C to 300°C (-58°F to 572°F). Exposure to temperatures exceeding 300°C can precipitate brittle intermetallic phases (such as Sigma phase), causing loss of toughness and corrosion resistance.

Q3: Why is Super Duplex 2507 widely specified for desalination Reverse Osmosis (RO) systems?
High-pressure RO membranes operate at high fluid pressures (60 to 80 bar) with concentrated chloride solutions. 2507’s combination of high yield strength (550 MPa) and resistance to pitting and crevice corrosion prevents localized failures without requiring excessive wall thickness.

Q4: How does Om Export India Pvt Ltd ensure the absence of Sigma phase in 2507 products?
All our Super Duplex 2507 pipes and tubes undergo solution annealing and rapid water quenching, followed by ASTM A923 Method A (Microscopic Etch Test), Method B (Charpy Impact Test at -40°C), and Method C (Ferric Chloride Pitting Test) verification.