Order Super Duplex 1.4410
Buy Super Duplex 1.4410 stainless steel in pipes, plates, bars, flanges and fittings. Competitive cost and ex-stock supply. Beyond materials, BACH INDUSTRY AG machines components, supports prototyping, and delivers full B2B services.
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Super duplex 1.4410 – also known by its UNS designation S32750 and the trade name SAF 2507 – is a high‑alloy duplex stainless steel. It combines roughly equal proportions of austenite and ferrite in its microstructure, which provides exceptional yield strength, very high resistance to pitting and crevice corrosion, and superior stress‑corrosion cracking performance compared with conventional austenitic steels. Thanks to its composition, the alloy is the material of choice in aggressive chloride environments such as offshore oil & gas, desalination plants and chemical processing. BACH INDUSTRY AG supplies super duplex 1.4410 products in a wide range of shapes and dimensions. We offer competitive pricing and responsive lead times, and we can sell or ship to Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa — wherever your project is located.
Chemical Composition
The corrosion resistance and mechanical strength of 1.4410 stem from its carefully balanced composition. High chromium (24–26 %), molybdenum (3–5 %) and nitrogen (0.24–0.32 %) contents significantly raise the pitting resistance equivalent number (PREN) and improve resistance to localized corrosion. Low carbon and sulfur levels ensure excellent weldability. The table below summarises typical compositional ranges for super duplex 1.4410.
| Element | Typical range (wt %) |
|---|
| Cr | 24 – 26 |
| Ni | 6 – 8 |
| Mo | 3 – 5 |
| Mn | ≤ 1.20 |
| Si | ≤ 0.80 |
| Cu | ≤ 0.50 |
| N | 0.24 – 0.32 |
| C | ≤ 0.030 |
| S | ≤ 0.020 |
| Fe | balance |
Thanks to the high alloying additions, super duplex 1.4410 achieves a PREN greater than 41. A PREN above 40 indicates outstanding pitting resistance and a critical pitting temperature exceeding 50 °C in chloride solutions. The PREN is calculated as Cr + 3.3 × Mo + 16 × N; increasing any of these elements improves localized corrosion resistance.
Mechanical and Physical Properties
Super duplex 1.4410 offers approximately twice the yield strength of common 300‑series stainless steels. The material is supplied in solution‑annealed condition, providing high toughness and good impact resistance down to sub‑zero temperatures. Typical properties are summarised below using values from bar and plate products.
| Property (room temperature) | Typical value |
|---|
| Density | 7.8 – 7.9 g/cm³ |
| Melting point | 1350 – 1450 °C |
| Thermal conductivity | ~13.5 W/m·K |
| Coefficient of thermal expansion | 13 – 14 × 10⁻⁶ /K (20–200 °C) |
| Yield strength Rp0.2 | ≥ 550 MPa (bars and plates) |
| Tensile strength Rm | 750 – 1000 MPa |
| Elongation | ≥ 25 % |
| Hardness | ≤ 300 HB (≤ 32 HRC) |
| Impact toughness | ≥ 45 J at –46 °C |
These high mechanical properties enable lighter constructions and improved safety factors compared with standard duplex grades. For instance, 1.4410 offers yield strengths around 550 MPa compared with ~450 MPa for grade 2205 (1.4462), enabling thinner wall sections without sacrificing strength.
Corrosion Resistance
The primary appeal of super duplex 1.4410 is its exceptional resistance to corrosion. High chromium, molybdenum and nitrogen contents deliver excellent resistance to pitting and crevice corrosion as well as chloride stress‑corrosion cracking. Manufacturers typically guarantee a PREN above 40, which corresponds to pitting resistance superior to most austenitic and standard duplex steels. The alloy maintains resistance in acidic environments and shows a critical pitting temperature exceeding 50 °C in chloride media. This makes 1.4410 suitable for seawater, brines, sour gas, and chemical processing environments where lesser steels quickly fail.
Comparison with Related Duplex Grades
1.4410 vs 2205 (1.4462)
Standard duplex 2205 (1.4462) contains about 22 % chromium, 5 % nickel and 3 % molybdenum. In contrast, 1.4410 contains roughly 25 % Cr, 7 % Ni, 4 % Mo and ≈0.27 % N. These higher alloy additions increase the PREN and raise both yield strength and tensile strength. Typical tensile strengths for 1.4410 pipes fall between 730 – 930 MPa with a minimum yield strength of about 530 MPa, while 2205 duplex pipe provides lower mechanical values. Consequently, 1.4410 offers markedly better resistance to pitting, crevice corrosion and stress‑corrosion cracking and allows for lighter, more corrosion‑resistant designs.
1.4410 vs S32760 (1.4501)
Both UNS S32750 (1.4410) and UNS S32760 (1.4501) are super duplex grades. They share similar mechanical properties and PREN values. S32760 contains controlled additions of copper and tungsten to improve corrosion resistance in certain acid or brine environments, whereas 1.4410 is optimized for general high‑chloride service. When evaluating between the two, designers consider specific media (e.g., sour brine), temperature and fabrication requirements. Both grades offer yield strengths around 550 MPa and tensile strengths around 750–930 MPa.
Thermal and Processing Considerations
Super duplex 1.4410 exhibits lower thermal expansion and higher thermal conductivity than austenitic stainless steels, which reduces distortion during fabrication and improves heat dissipation. The alloy is typically supplied in the solution‑annealed condition. Heat treatment involves solution annealing at approximately 1025 – 1100 °C followed by rapid quenching to restore corrosion resistance and mechanical properties. Welding requires strict control of heat input and interpass temperature; improper welding can degrade the duplex microstructure and reduce toughness. Processes such as SMAW, GTAW and SAW are commonly used with suitable super duplex filler metals.
Standards and Certification
Numerous international standards cover super duplex 1.4410 in different product forms. Plates, sheets and coils conform to ASTM A240, EN 10028‑7, EN 10088‑2 and EN 10088‑4. Bars and forgings are specified by ASTM A276, ASTM A479 and ASTM A182. Reference standards for corrosion testing include NACE MR0175/ISO 15156‑3 and NACE MR0103/ISO 17945, which certify suitability for sour oil and gas service. BACH INDUSTRY AG can supply mill test certificates (EN 10204 3.1 MTC) on request.
As part of our purchase options, we supply ASTM A182 F53 flanges, ASTM A240 1.4410 plates and ASTM A276 1.4410 bars to ensure that buyers receive products manufactured to recognized international standards.
Applications
Because of its strength and corrosion resistance, super duplex 1.4410 is widely used in demanding industries. Common applications include:
Offshore oil & gas – subsea pipelines, risers, manifolds and heat exchangers.
Desalination and water treatment – pressure vessels, pumps and evaporators.
Chemical processing and petrochemical – reactors, columns and piping systems.
Pulp & paper – digester components and bleaching equipment.
Structural and marine – load‑bearing beams, flanges, shafts and propellers.
Super duplex 1.4410 is also selected for fans, wire, fittings, storage vessels, hydraulic piping, heat exchangers and hot water tanks.
Product Forms Available from BACH INDUSTRY AG
BACH INDUSTRY AG stocks a comprehensive range of super duplex 1.4410 products to suit different project requirements. Our catalogue includes super duplex 1.4410 pipe (both seamless and welded), tube, sheet, plate, bar (including round bar), flanges, fittings and fasteners — ensuring the exact product for your application. Typical shapes include:
| Product form | Notes |
|---|
| Pipes & tubes | Seamless and welded pipe/tube suitable for high‑pressure fluid transport. Available in sizes up to OD 630 mm. |
| Sheet & plate | Cold‑rolled and hot‑rolled plates with thicknesses from 0.4 mm up to 60 mm. |
| Bar & round bar | Hot‑finished and cold‑drawn bars in diameters from 16 mm to 406 mm. |
| Flanges & fittings | Forged flanges and fittings conforming to ASTM A182 F53; options include weld neck, slip‑on and blind flanges. |
| Fasteners | Bolts, nuts and screws produced from 1.4410 offer high strength and corrosion resistance. |
Our inventory also includes equivalent grades such as UNS S32750 and SAF 2507, as well as complementary super duplex alloys (e.g., UNS S32760). We accommodate minimum order quantities and can provide bespoke cut lengths or machining services. All products are supplied with traceable documentation and can be shipped worldwide.
Buying from BACH INDUSTRY AG
As a specialist supplier, manufacturer and distributor of super duplex 1.4410 stainless steels, BACH INDUSTRY AG offers more than just material. We provide technical support, logistics and competitive price per kg quotes. When you buy from us, you benefit from:
Competitive costs and transparent pricing – our close relationships with qualified mills allow us to offer favourable cost structures. Our sales team can prepare quotations detailing the price per kilogram or per unit length for customers in Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa.
Fast lead times and reliable stock – as a stockist we maintain an extensive inventory of pipes, sheets, plates and bars. We can accommodate minimum order quantities (MOQs) to reduce lead time and ensure timely delivery.
Quality documentation – every batch is accompanied by EN 10204 3.1 Material Test Certificates (MTC 1.4410) and, where required, compliance with NACE MR0175/ISO 15156 for sour‑service applications.
Technical assistance – our metallurgists can advise on material selection, welding procedures and machining techniques to help you optimize performance and total cost of ownership. We also assist in selecting the correct product form (pipe, tube, sheet, plate, bar, flange, fitting or fastener) for your application.
Whether you need a small quantity for prototype work or bulk volumes for a major project, BACH INDUSTRY AG can help. Contact us today to request a quote or to discuss your buying requirements. We are proud to support customers across Europe and Africa with premium super duplex materials.
Conclusion
Super duplex 1.4410 (UNS S32750, SAF 2507) is a high‑performance stainless steel designed for extreme environments. Its high chromium, molybdenum and nitrogen contents deliver a PREN greater than 41 and ensure resistance to pitting, crevice corrosion and stress‑corrosion cracking. The alloy offers yield strengths around 550 MPa and tensile strengths up to 1000 MPa, enabling lighter structures without compromising safety. As a leading supplier, BACH INDUSTRY AG provides certified super duplex products, competitive pricing and global logistics support. For more information, please contact us — our team is ready to help you find the right solution for your next project.
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