When to pick this combination
Pick DED-powder 316L for large stainless structural sections (pressure vessels, marine fittings, large valve bodies) that exceed an L-PBF chamber, and for cladding new corrosion-resistant material onto carbon-steel substrates. The combination of 316L's weldability and DED's deposition rate makes this one of the most established large-part AM routes.
- Pressure-vessel structural sections > 50 kg
- Marine and oil-and-gas fittings
- Corrosion-resistant cladding onto carbon steel
- Hybrid build on machined-from-billet substrates
Typical defects and how the model accounts for them
Inter-layer porosity at vector turnaround and Marangoni-driven surface waviness are the dominant defects. Plan 3–8 mm of machining allowance per face. Sensitisation (Cr-carbide precipitation) is a risk on reheat-affected zones; pick L for the lower-carbon stabilisation.
Required post-processing
The allowables above assume the full post-processing chain. Skipping any step degrades the row by 15–35 %.
- Stress relief: 600 °C / 2 h / Ar
- Solution: 1050 °C / 1 h / WQ (optional, for sensitisation recovery)
- Rough then finish machine all functional surfaces
- Liquid-penetrant inspect machined surfaces
- Passivate per ASTM A967
Suggested build parameters
Starting recipe; tune against first-article inspection on geometry-sensitive features.
- Deposition rate: 0.4–1.0 kg/h
- Layer: 0.5–1 mm
- Powder feed: 15–25 g/min
- Shield gas: Ar (high purity)
Frequently asked questions
How does DED-316L compare to weld-clad 316L?
Quality is comparable but DED gives tighter dimensional control and parameter traceability. Most welding codes already cover the relevant qualifications.
Sources
- AWS D20.1/D20.1M:2023 Specification for Fabrication of Metal Components using AM
- ASTM A240 — Standard Specification for Cr and CrNi Stainless Steel Plate