Order Duplex 1.4462 Stainless Steel – Fast Delivery, Certified Quality

Introduction

Duplex 2205, also known by the EN designation 1.4462, is a duplex stainless steel that combines ferritic and austenitic phases in roughly equal proportions. Common aliases include UNS S31803, UNS S32205, Werkstoff 1.4462 and the German steel name X2CrNiMoN22‑5‑3. This alloy derives its name from its typical composition: around 22 % chromium and 5 % nickel. Its balanced two‑phase microstructure provides high strength, good toughness and much better resistance to chloride‑induced corrosion than standard austenitic grades such as 316L. Because of this performance, Duplex 2205 has largely replaced high‑nickel alloys like 904L in many applications.

BACH INDUSTRY AG is a Swiss procurement specialist supplying duplex 1.4462 stainless steel and other high‑performance materials. The company operates a global sourcing hub with more than 120 verified partners, manages production and customs formalities, and performs 100 % incoming goods inspection in Switzerland. Raw materials stocked include duplex 1.4462 and super duplex 1.4410, and standard components are available from a Swiss warehouse with no minimum order quantity and call‑off within five working days. The following guide presents key technical data on Duplex 2205 and explains how to purchase it from BACH INDUSTRY AG.

What is Duplex 2205 (EN 1.4462)?

Duplex 2205 is the archetypal duplex stainless steel. Its metallurgical structure consists of approximately 50 % austenite and 50 % ferrite, which imparts a combination of strength and corrosion resistance that is superior to conventional austenitic grades. The alloy contains high levels of chromium (22–23 %), molybdenum (2.5–3.5 %), nickel (4.5–6.5 %) and nitrogen (0.14–0.20 %). Two UNS designations exist: S31803 is the original specification, while S32205 is an updated formulation with slightly higher chromium, molybdenum and nitrogen contents. S32205 therefore offers marginally better pitting resistance, but both grades are often dual‑certified and marketed simply as duplex 2205.

Compared with standard austenitic stainless steels (304/316), duplex 2205 delivers nearly twice the yield strength, allowing designers to reduce section thickness and lower material costs. The alloy’s pitting and crevice corrosion resistance (calculated via the Pitting Resistance Equivalent Number, PREN) is around 35 – 36, comparable to the high‑alloy austenitic grade 904L. However, duplex 2205 contains less nickel and is therefore more cost‑effective.

The mixed microstructure provides good toughness but imposes service temperature limits. At temperatures above about 300 °C brittle intermetallic phases can precipitate, and at temperatures below –50 °C a ductile–to‑brittle transition occurs; the alloy should not be used outside this range. Fushun Special Steel recommends limiting continuous service between –46 °C and 315 °C and avoiding prolonged exposure between 315 °C and 980 °C to prevent sigma‑phase formation.

Chemical Composition & Microstructure

Duplex 2205’s composition is tightly controlled. Table 1 summarises typical chemical ranges for the two UNS designations.

These alloying additions produce a ferrite–austenite balance of roughly 50:50. The high chromium and molybdenum contents, combined with nitrogen, yield a PREN of around 35 – 36—considerably higher than 316L (PREN ≈ 25) and similar to 904L. Such composition provides superior resistance to pitting and crevice corrosion.

Key Properties at a Glance

Mechanical properties

Duplex 2205 has mechanical strength far exceeding 300‑series austenitic stainless steels. Typical values for flat products are shown in Table 2.

For comparison, 316L stainless steel has a yield strength around 205 MPa and tensile strength of 520–720 MPa. The much higher yield strength of duplex 2205 enables weight reduction in pressure vessels and structural components.

Physical properties

Duplex 2205 also offers favourable physical properties. Its density is approximately 7.8 g/cm³, slightly lower than carbon steel. The modulus of elasticity at 20 °C is about 200 GPa. Thermal conductivity at 20 °C is roughly 15 W/m·K, and the coefficient of thermal expansion between 20 °C and 100 °C is about 13.7×10⁻⁶ /°C. Duplex 2205 is ferromagnetic.

Corrosion and durability

The high chromium, molybdenum and nitrogen contents give duplex 2205 excellent resistance to localized corrosion. Mega Mex notes that the alloy’s corrosion resistance is superior to 316L and 317L in most environments, while Fushun reports a critical pitting temperature (CPT) significantly higher than 316L and 317L. Grade 2205 resists chloride stress corrosion cracking up to about 150 °C and exhibits good resistance to general corrosion, erosion corrosion and corrosion fatigue. Because it has a low coefficient of thermal expansion, distortion during welding is lower than in austenitic grades.

Service temperatures

Duplex 2205 should be used between –46 °C and 315 °C. Fushun states that continuous service above 600 °F (315 °C) can cause sigma‑phase precipitation and degrade toughness and corrosion resistance. Conversely, the microstructure becomes brittle below –50 °C. Designers should therefore restrict long‑term service to this moderate temperature window.

Forms, Standards & Certificates

BACH INDUSTRY AG offers duplex 1.4462 in a wide range of product forms. Typical dimensions supplied by Fushun are listed below to illustrate the breadth of available products:

• Plates and sheets: thicknesses from 0.5 mm to 150 mm, widths up to 3 m, and lengths up to 12 m.

• Bars and rods: round, square, flat and hexagonal sections; diameters from 5 mm to 300 mm and lengths up to 6 m.

• Pipes and tubes: seamless and welded pipes with outside diameters from 6 mm to 508 mm, and seamless or welded tubes up to 25 m long.

• Fittings and flanges: elbows, tees, reducers, caps, threaded fittings and flanges conforming to ASTM A815 and ASTM A182.

• Fasteners: bolts, nuts and washers can be supplied on request.

Standard specifications include ASTM A240 for plate, A276 for bar, A789/A790 for seamless and welded tube/pipe, A182 for forgings and flanges and EN 10088 for European plate and sheet. BACH INDUSTRY AG provides material certificates to EN 10204 3.1, and material can be supplied compliant with NACE MR0175, PED/CE marking and DFARS/EU origin as required. The company also offers cutting to size, export packing and preparation of customs documentation. Customers in Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa benefit from fast delivery because standard components are stocked in Switzerland and can be dispatched without minimum order quantities.

Welding, Heat Treatment & Processing

Heat treatment

Optimal properties are achieved through solution annealing between 1040 °C and 1150 °C (1900–2100 °F) followed by rapid cooling, preferably water quenching. Stress relief at lower temperatures is not recommended because it can precipitate deleterious phases. Service temperatures should be limited to –50 °F (–46 °C) to 600 °F (315 °C); prolonged exposure above this range promotes sigma‑phase formation and reduces toughness.

Forming

Due to its high strength, duplex 2205 requires higher forming forces than austenitic stainless steels. Hot forming should be performed between 950 °C and 1230 °C (1750–2250 °F) and followed by solution annealing and rapid cooling to restore the optimum phase balance. Cold forming demands roughly 50–60 % more force than 304/316 stainless steels and minimum bend radii of three to four times the material thickness. Significant cold work (>10 % deformation) should be followed by solution annealing.

Welding

Duplex 2205 is readily weldable but requires control of heat input to maintain the ferrite/austenite balance. Recommended filler metals are E2209/ER2209, which match the base‑metal chemistry. Heat input should be kept between 0.5 – 2.5 kJ/mm and the interpass temperature limited to 150 °C. Pure argon shielding gas may be enriched with 1–3 % nitrogen to promote austenite formation. Preheating is generally unnecessary, and post‑weld heat treatment is usually avoided unless solution annealing is needed to restore corrosion resistance.

Machining

The high strength and work hardening rate of duplex 2205 require adjustments when machining. Cutting speeds should be roughly 20 % lower than those used for 304/316 stainless steels. Robust machine tools, sharp cutting edges and large rake angles are recommended to reduce work hardening and tool wear. Adequate cooling and relatively large feed rates help maintain tool life.

After fabrication, surfaces should be cleaned, pickled and passivated to maintain corrosion resistance.

Where 2205 Excels: Typical Applications

Duplex 2205’s strength and corrosion resistance make it suitable for many demanding applications:

• Oil and gas industry: used in flowlines, separators, process piping and offshore platform components because of its high resistance to sour‑gas environments and chloride stress corrosion.

• Chemical processing: pressure vessels, storage tanks, heat exchangers and reactors handling aggressive chemicals benefit from 2205’s corrosion resistance and high strength.

• Marine and desalination: seawater systems, propeller shafts, structural components and desalination equipment exploit the alloy’s superior chloride resistance.

• Pulp and paper: digesters, bleach washers and stock handling equipment resist the corrosive chloride-containing chemicals used in pulp processing.

• Environmental control: flue‑gas desulfurisation systems and scrubbers.

• Food processing: storage tanks and equipment exposed to acidic products and cleaning solutions.

• Structural applications: bridge components and support structures in aggressive marine or industrial atmospheres take advantage of 2205’s high strength and corrosion resistance.

Compared with austenitic grades, these applications often allow thinner sections, reducing weight and cost. Because of its performance, duplex 2205 is now widely used in place of 304/316 stainless steels and even high‑nickel alloys like 904L.

2205 vs Alternative Grades

316L and 317L

Standard 316L stainless steel contains about 16 % Cr, 10 % Ni and 2 % Mo. Its yield strength (~205 MPa) and resistance to chloride pitting are much lower than those of duplex 2205. Mega Mex notes that 2205 provides corrosion resistance superior to both 316L and 317L in most environments. 316L, however, offers easier processing and welding and is suitable for applications where high strength is not required.

904L

Grade 904L is a nickel‑rich austenitic stainless steel containing 23–28 % Ni and 4–5 % Mo. It offers excellent resistance to reducing acids and has good formability, but its high alloy content makes it expensive. The AZoM datasheet notes that many applications formerly using 904L are now replaced by lower‑cost duplex 2205. Duplex 2205 delivers similar pitting resistance and significantly higher strength.

Super duplex 1.4410 (2507)

Super duplex stainless steels, typified by EN 1.4410 (UNS S32750/2507), contain 24–26 % Cr and 3–5 % Mo and have PREN values above 40. As a result they provide even greater corrosion resistance than 2205 but at higher cost and with reduced formability. Tensile and yield strengths for 2507 can reach ~1 000 MPa and 800 MPa respectively. Duplex 2205 therefore offers an attractive balance between cost, mechanical strength and corrosion resistance for most applications.

304 stainless steel

304 stainless steel contains approximately 18 % Cr and 8 % Ni and lacks molybdenum. While it is the most economical option, its susceptibility to chloride pitting and lower mechanical strength make it unsuitable for aggressive environments compared with duplex 2205.

Pricing, Availability & How to Buy

The cost of duplex 1.4462 products depends on factors such as alloy surcharge (tied to chromium, nickel and molybdenum prices), product form, dimension and order quantity. BACH INDUSTRY AG mitigates price volatility by keeping stock in its Swiss warehouse and working with more than 120 partners worldwide. Standard plates, bars and tubes can often be dispatched within five working days. Custom dimensions or large projects may require additional manufacturing time, but the company’s AI‑based matching algorithm quickly finds the optimal production route and price.

Customers in Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa benefit from local support and logistics. Our Swiss warehouse holds duplex 1.4462 plate, sheet, coil, pipe and bar ready for immediate purchase. Prices per kilogram are competitive across these regions, and BACH INDUSTRY AG can provide cost breakdowns and buying options on request. When budgeting projects, remember that the high strength of duplex 2205 allows thinner sections and can reduce overall cost, especially when replacing 316L or 904L. The sales team can also arrange export packing, customs clearance and door‑to‑door delivery to the EU or Africa.

To obtain a quote, send your technical drawing or bill of materials to BACH INDUSTRY AG. Specify the product form (plate, tube, bar, fittings, flanges or fasteners), dimensions, tolerances, required surface finish and destination. Our team will confirm stock availability, lead time and pricing for your region (for example, Switzerland or Belgium). Volume discounts are available for large orders, and there is no minimum order quantity for standard components.

Quality, Compliance & Documentation

BACH INDUSTRY AG operates under ISO‑compliant quality management. Incoming goods are inspected, materials are analysed and functional tests are performed according to customer specifications. Each shipment is supplied with a material test certificate (EN 10204 3.1) and full traceability. When required, the material can be supplied with NACE MR0175 certification for sour‑service applications, PED/CE marking for pressure equipment, and DFARS/EU origin declarations.

Packaging follows international standards; pipes and tubes can be supplied with end caps and wrapped to prevent contamination, and plates and bars are shipped on pallets or in crates. For exports outside Switzerland, BACH INDUSTRY AG prepares customs documents and manages clearance. Customers in Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa benefit from local customs expertise and duty‑free warehousing when available.

Request a Quote

To begin your project, request a quote from BACH INDUSTRY AG. Upload your drawings or material lists and indicate the following details:

• Product form (plate, sheet, coil, bar, pipe, tube, fittings, flanges or fasteners) and specification (ASTM/EN standard).

• Required thickness/diameter, width and length, including cut‑to‑size requirements.

• Surface finish, tolerances and any heat treatment or testing requirements.

• Destination (Switzerland, Germany, Austria, Liechtenstein, Belgium, Africa or other region) and preferred delivery terms.

• Required certificates (EN 10204 3.1, NACE MR0175, PED/CE, DFARS/EU origin) and any project‑specific documents.

Our team will evaluate your request, check stock or allocate production, and provide an offer including price, lead time and shipping options. With an extensive partner network and Swiss quality control, BACH INDUSTRY AG ensures reliable supply of duplex 1.4462 wherever you operate.