Stainless steel 3D printing with robotic Wire Arc Additive Manufacturing (WAAM) is an advanced robotic manufacturing process that deposits standard industrial welding wire layer by layer into dense, certified components. It is heavily used for offshore and maritime applications to bypass highly congested supply chains.
Duplex and super duplex forgings, such as flanges, manifolds, valve bodies, and pressure vessel nozzles, typically experience severe lead times of 6-18 months from specialist foundries. Because the global supply of duplex forging capacity is concentrated in very few facilities, a single part delay can stall an entire offshore infrastructure project. MX3D solves this by starting production within weeks, eliminating the need for custom tooling and bypassing the foundry queue. This DNV-certified process rigorously covers SS316L, duplex 2205, and super duplex 2507.
Why WAAM Is Ideal for Stainless Steel and Duplex Components
The Offshore Supply Chain Problem, and WAAM’s Answer
Procuring duplex and super duplex forgings involves navigating a limited global supply, accepting lead times of 6-18 months, and frequently committing to high minimum order quantities. Wire Arc Additive Manufacturing starts production in weeks, allows for a single-piece minimum order, and eliminates tooling costs.
Duplex Grades: Why WAAM Works Thermally
Duplex stainless steels require a highly specific, balanced austenite/ferrite microstructure (roughly 50/50) to achieve their strength and corrosion resistance. The WAAM process allows for a highly controlled thermal cycle that can be meticulously managed to maintain this necessary duplex microstructure. This is typically followed by a rigorous solution annealing process at 1020-1080°C to perfectly restore the required phase balance.
Available Stainless Steel Grades
| Grade | Type | UNS / EN | Key Properties | Application |
| SS316L | Austenitic | S31603 / 1.4404 | Corrosion-resistant, weldable, widely certified | Piping, valve bodies, and general marine |
| Duplex ER2205 | Duplex | S32205 / 1.4462 | High strength (2× austenitic) + corrosion resistance | Offshore vessels, pressure piping, and manifolds |
| Duplex ER2209 | Duplex Filler Metal | S39209 / W 22 9 3 NL | High tensile strength, over-alloyed with nickel for proper ferrite balance | Welding consumables for Duplex 2205 |
| Super Duplex ER2594 | Super Duplex | S32750 / 1.4410 | Highest pitting resistance (PREN ~42), seawater resistant | Subsea, chloride-rich environments, heat exchangers |
Do you need specific information about any material? Talk to our materials specialists now →
MX3D Stainless Steel 3D Printing: What We Deliver
Mechanical Properties
| Property | WAAM ER316LSi (MX3D) | Wrought S316L | WAAM Duplex ER2209 (MX3D) | Wrought Duplex 2205 | WAAM Super Duplex ER2594 (MX3D) | Wrought Super Duplex 2507 |
| UTS | 610 MPa | 485 MPa | 750 MPa | 620 MPa | 760 – 850 MPa | 800 – 1000 MPa |
| YTS | 330 MPa | 170 MPa | 580 MPa | 450 MPa | 550 – 580 MPa | 550 MPa |
| A% | 34% | 40% | 30% | 25% | 30 – 35% | 25% |
Chemical & Hardness Properties
| Property | WAAM ER316LSi (MX3D) | Wrought S316L | WAAM Duplex ER2209 (MX3D) | Wrought Duplex 2205 | WAAM Super Duplex ER2594 (MX3D) | Wrought Super Duplex 2507 |
| PREN | ~27 | ~24 | – | ~35 | ~42 | > 41 |
| Hardness | 185 HV10 | ~150 HB | 260 HV10 | ~290 HB | AFTER | ≤ 300 HB (~290 HB) |
Post-Processing Capabilities
- Solution Annealing: Rigorously applied and required for duplex grades to stabilize microstructure.
- Non-Destructive Testing (NDT): Comprehensive UT, RT, PT, and MT testing as required per certification standards.
- Surface Treatment: Passivation and targeted surface treatments applied as required for extreme environments.
Planning to start your next project with us? Request a Stainless Steel Quote
Applications for 3D Printed Stainless Steel
Energy
We utilize duplex and super duplex grades to 3D print certified components for extreme conditions.
Maritime & Shipbuilding
Operating with specialized grades, we supply shipbuilders with large on-demand spares such as Aluminum Cowl Vents and Bronze Propellers to drastically reduce downtime.
Defense
We provide a localized, independent supply chain for the defense sector, printing high-strength steel replacements and large structural elements entirely on demand.
Automotive
From custom Wheel Brackets to massive chassis prototypes and specialized tooling, our technology accelerates engineering for vehicles and heavy transport.
Architecture & Construction
We turn digital coordinates into physical reality. As seen in the ESA Floor and the Takenaka Steel Connector , WAAM allows structural engineers to fabricate complex structural steel nodes and one-off architectural elements.
Manufacturing & Tooling
We use rapid-prototype tooling inserts and manufacture robust custom parts like industrial Molds and Robot Arms using specialized carbon and tool steels.
Art & Design
We bring massive, complex metallic designs to life. Installations like The Underground Tree, the Gradient Screen, and the Dolium stand as perfect testaments to our ability to combine total geometric freedom with absolute structural integrity.
Find out more about our MX3D Art Lab methods and start your next print with us.
Frequently Asked Questions About Stainless Steel 3D Printing
Can WAAM print duplex stainless steel?
Yes, WAAM is highly effective for printing duplex stainless steel. By carefully managing the thermal cycle during robotic deposition and applying rigorous post-print solution annealing at 1020-1080°C, the required 50/50 austenite/ferrite microstructure is successfully achieved.
What stainless steel grades can be 3D printed with WAAM?
WAAM supports a robust portfolio of industrial stainless steels. This actively includes standard austenitic grades like SS316L, high-strength Duplex 2205, and highly corrosion-resistant Super Duplex 2507, all deposited using standard commercial welding wires.
What are the mechanical properties of WAAM stainless steel compared to forged?
WAAM stainless steel parts deliver mechanical properties that closely match or occasionally exceed those of standard wrought materials. For example, WAAM-deposited SS316L and Duplex 2205 achieve comparable Ultimate Tensile Strength (UTS), yield limits, and required hardness thresholds, making them a safe replacement for heavy forgings.
Is WAAM stainless steel DNV certified?
Yes, MX3D’s WAAM stainless steel production operates under strict DNV certification. This comprehensive qualification covers the materials and robotic processes required to safely deploy large-scale 3D printed components directly into offshore and maritime environments.
How does WAAM stainless steel compare to forging for offshore applications?
Forging offshore duplex components requires 6 to 18 months of lead time and heavy custom tooling investments. WAAM eliminates mold costs, limits raw material waste via near-net-shape deposition, and delivers fully dense, DNV-certified structural parts in a matter of weeks rather than months.
Can WAAM print super duplex 2507?
Yes. Super Duplex 2507 is a critical material in the WAAM portfolio, selected specifically for subsea components and manifolds that require the highest possible pitting resistance equivalent number (PREN) to survive highly corrosive seawater and chloride-rich environments.
Need a Stainless or Duplex printed part?
Whether you need DNV-certified SS316L, duplex 2205, or super duplex 2507, MX3D operates Europe’s most certified and automated production facility to deliver your heavy components on time.
