S32707 is a hyperduplex alloy that contains approximately 50% ferrite and 50% austenite. For the most severe operating conditions, high chromium, molybdenum, and nitrogen levels result in a PREN over 49 and a yield strength over 700 MPa.
ASTM A790 S32707 Hyper Duplex Seamless Pipe
UNS S32707, W.Nr. 1.4658, and SAF 2707 HD can be distinguished as ferritic-austenitic stainless steels. We at XTD (Zhejiang Xintongda Special Steel) are trusted manufacturers and suppliers of S32707 hyper duplex seamless pipes. We manufacture pipes that remain consistent with ASTM A790 and A928 standards. Our team cold-rolls, draws, anneals, pickles, and meticulously bends each one. This ensures absolute structural integrity for all your rigorous industrial applications.
ASTM A790 S32707 Hyper Duplex Seamless Pipe has a chemical composition of 26-29% chromium, 5.5-9.5% nickel, 4-5% molybdenum, 0.30-0.50% nitrogen, providing reliable localised corrosion resistance. Its strong chlorine resistance prevents pitting and stress corrosion cracking. This hyper-duplex grade guarantees the integrity of your offshore and desalination infrastructure from -50°C to 300°C, while delivering the enduring mechanical performance necessary for your complex projects.
XTD actively supports global enterprises with 25,000 tonnes of annual production, a mission we’ve held since 1985. We prioritise project execution by delivering industry-leading stock products in just one week. Our team also manages flexible custom production within 15–60 days. Engineers seeking durable pipe solutions in harsh industrial circumstances depend on our high-performance metallurgy and scalable supply.
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Standard
ASTM A790
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OD Range
6-457 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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How S32707 Hyper Duplex Seamless Pipe is Produced
We ensure high-quality S32707 hyperduplex seamless pipe by adhering to strict manufacturing procedures. Hot extrusion or piercing of a hyper duplex ferritic-austenitic stainless steel ingot results in a seamless shell. Cold drawing, cold rolling, and pilger rolling all help to achieve accurate pipe dimensions.
Our team re-establishes the appropriate ferrite-austenite phase equilibrium using solution annealing and guarantees surface cleanliness through pickling. We actively conduct straightening, eddy-current testing, and hydrostatic pressure testing prior to final packaging. These steps ensure your material is perfectly prepared for demanding high-stress industrial applications. To know more about our manufacturing process, visit our page. We actively monitor every stage for your safety. To get more information about our manufacturing, please visit our production page.
Key Features of S32707 Hyper Duplex Seamless Pipe
- Highest PREN Among Duplex Grades: S32707 actively outperforms super duplex S32750 and S32760 in pitting resistance. PREN above 49 handles aggressive chloride conditions. It protects infrastructure from the harshest saltwater corrosion in seawater applications.
- Exceptional Strength-to-Weight Ratio: Yield strength approaching 700 MPa allows for thinner wall designs and significant weight reductions in subsea and desalination piping systems, cutting material costs and installation loads.
- Outstanding Chloride Stress Corrosion Resistance: The duplex microstructure, along with elevated nitrogen levels, effectively mitigates chloride-induced stress corrosion cracking at temperatures that compromise austenitic grades, rendering it dependable for produced-water and seawater injection applications.
- Excellent Fatigue Resistance: Higher fatigue strength than super duplex grades makes S32707 well-suited for cyclic-loaded subsea and offshore risers subjected to wave-induced dynamic loads throughout service life.
- Good Weldability with Controlled Heat Input: S32707 is welded using matching or overmatching duplex filler wire. Strict heat-input control during welding preserves the required ferrite-austenite phase balance and corrosion performance.
- High Critical Pitting Temperature: ASTM G48 Method A validates S32707 for hot brine and seawater service with a critical pitting temperature over 90°C. This exceeds all regular and super duplex grades, keeping your infrastructure safe and reliable in harsh industrial heating settings.
ASTM A790 S32707 Hyper Duplex Seamless Pipe Equivalent Materials
S32707 Hyper Duplex, a well-known hyper duplex stainless steel, is specified across global industries. Common international equivalents support a consistent supply for engineering projects worldwide.
| GRADE | UNS | DIN/EN W.Nr. | Trade Name |
| S32707 Hyper Duplex | S32707 | 1.4658 | SAF 2707 HD |
100% Certified Testing & Documentation
Every shipment of S32707 hyper duplex seamless pipe leaves our facility with detailed documentation validating the chemistry, mechanical performance, corrosion behaviour, and dimensional accuracy. XTD is NORSOK M650 qualified and supplies with full EN 10204 3.1 certification as standard.
- EN 10204 3.1 and 3.2 Material Test Certificates (MTC)
- 100% PMI (Positive Material Identification)
- Heat Treatment Charts
- Third-Party Inspection Reports (TPI / TUV / BV / SGS)
- Manufacturer Test Certificate: Impact, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain Size, ET, UT, HT
- Laboratory Test Certificate from a Government-Approved Lab
S32707 Hyper Duplex Seamless Pipe Industrial Applications
XTD supplies S32707 hyper duplex seamless pipes to industries operating in aggressive chloride environments, including offshore oil and gas, desalination, chemical processing, and power generation.
Subsea Oil and Gas Flowlines
We supply S32707 pipes to protect subsea manifolds, jumpers, and flowlines in deep-water chloride environments. These pipes withstand pressures above 15,000 psi. We prioritise pitting and SCC resistance, ensuring your critical underwater infrastructure performs reliably.
Deep-Water Offshore Risers
Our S32707 Pipes serve offshore production risers and tiebacks where combined fatigue loading and chloride SCC resistance are the primary design drivers for material selection.
Desalination Plant High-Pressure Piping
S32707 is used in reverse-osmosis high-pressure headers, energy-recovery devices, and brine-concentrate pipework for high-temperature, high-concentrate seawater.
Chlor-Alkali Plant Piping
Our pipes handle wet chlorine, hypochlorite, and concentrated brine service in chlor-alkali facilities where standard duplex grades are inadequate, and higher chloride resistance is required.
Mining and Hydrometallurgical Autoclaves
S32707 is used in pressure oxidation autoclaves and acid-chloride leach circuits in copper, nickel, and gold recovery operations where combined acid and chloride attack occurs.
Industrial FGD Absorbers
Our pipes serve limestone and seawater FGD absorbers, where chloride pitting is the primary life-limiting corrosion mechanism, and standard super duplex grades fall short.
Frequently Asked Questions
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What is S32707 hyper duplex Stainless Steel?
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How does S32707 compare to Super Duplex grades?S32707 offers about 15% higher yield strength and significantly higher pitting resistance than S32750 and S32760. It enables thinner walls and extends service into more aggressive chloride-containing environments.
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What is the upper service temperature of S32707?S32707 is limited to roughly 300°C maximum to avoid sigma and chi-phase precipitation. Above this temperature, the ferrite phase destabilises, and both corrosion resistance and toughness degrade rapidly.
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What testing is required for S32707 Pipes?Ferrite quantification according to ASTM E562 and ASTM G48 methodology A pitting test exceeding 50°C and ASTM A923 detrimental-phase screening are common industry verifications mandated in addition to the fundamental ASTM A790 standards.