When to pick L-PBF 316L
316L's draw is its corrosion resistance in marine, chemical, and biological environments combined with very high ductility. Unusually for AM, L-PBF 316L is stronger than wrought 316L — the fine cellular structure raises yield by 30–50 %.
Pick it for fluid handling, marine fittings, medical instruments, and parts that need both strength and corrosion margin.
Defects and post-processing
Porosity is low (< 0.3 %) and the alloy is very forgiving of parameter drift. The main post-processing decision is whether to anneal — annealing trades ~30 % yield strength for double the elongation.
For pitting resistance in chloride environments, electropolish exposed surfaces.
Suggested parameters
Starting recipe on a 400 W Yb-fiber machine at 30 µm layer.
- Layer thickness: 30 µm
- Laser power: 200 W
- Scan speed: 900 mm/s
- Hatch spacing: 110 µm
- Atmosphere: argon, O₂ < 500 ppm
Frequently asked questions
Is L-PBF 316L really stronger than wrought 316L?
Yes — yield is typically 30–50% higher in the as-built condition due to the sub-micron cellular structure. Annealing erases the difference.
How does it compare to L-PBF 17-4 PH?
316L is much more ductile and corrosion-resistant; 17-4 PH (after H900) is about 2× stronger. Pick by environment first, strength second.
Sources
- ASTM F3184 — AM 316L Stainless
- EOS StainlessSteel 316L datasheet
- MMPDS-2024 (reference wrought values)