Selective Laser Melting (SLM) Providers
Selective Laser Melting uses a high-power laser to fully melt metal powder layer by layer, producing near-fully-dense parts suited to aerospace, medical, and industrial applications. SLM supports reactive metals like titanium and nickel superalloys, making it the process of choice for structurally critical components. Browse verified SLM providers screened for material traceability, machine calibration, and post-processing capability.
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How Selective Laser Melting works
SLM is the trademark coined by SLM Solutions (now Nikon SLM Solutions) for the laser powder bed fusion process. Like DMLS and LPBF, it fully melts a thin (20–60 micron) layer of fine metal powder using a high-power fibre laser inside an inert-atmosphere chamber, then lowers the build plate, recoats, and repeats. The resulting parts reach >99.5% of wrought density and accept the same heat-treatment, HIP, and machining post-processing routes as DMLS or LPBF parts.
In sourcing terms, "SLM provider" usually signals a shop running SLM Solutions hardware — most commonly the SLM 280, SLM 500, or the large-format SLM 800 / NXG XII 600. The platform's defining feature is dense multi-laser configurations: the NXG XII 600 runs twelve 1 kW lasers in parallel, delivering build rates that no single-laser system can match. For high-throughput aerospace and energy work — turbine components, rocket-engine hardware, large structurals — SLM-platform shops are often the first choice.
Common SLM applications
Rocket-engine combustion chambers and injectors
Large CuCrZr or Inconel chambers with internal cooling channels, built in days instead of months — a flagship use case for SLM 800 / NXG-class machines.
Aero-engine turbine blades and vanes
Inconel 718 / 625 hot-section components with internal cooling geometry, qualified under AS9100 and customer-specific airworthiness flow-downs.
Large titanium aerospace structurals
Multi-laser builds of bulkhead frames, gimbal mounts, and unitised structural panels in Ti-6Al-4V — replacing forged-and-machined assemblies on a 30–50% weight-saving target.
Heat exchangers and cold plates
AlSi10Mg or copper-alloy thermal-management hardware with internal lattice or TPMS geometry that traditional brazed-plate designs cannot replicate.
F1 and motorsport powertrain hardware
Turbo housings, exhaust manifolds, and gearbox internals in Inconel and Ti, often ordered as race-by-race iterations during the season.
Energy-sector valves and manifolds
Stainless or duplex valves with reduced part count and internal flow paths optimised for pressure drop, serving oil-and-gas and hydrogen applications.
Materials commonly processed by SLM
Ti-6Al-4V (Grade 5 / Grade 23 ELI)
Standard SLM titanium across aerospace and medical — Grade 23 for implants where interstitial limits matter. Always specify HIP for fatigue-critical parts.
Inconel 718 / 625
Workhorse nickel superalloys for hot-section components. SLM-platform shops typically have well-developed double-stage heat-treat protocols (solution + age) for 718.
AlSi10Mg / Scalmalloy
AlSi10Mg is the default lightweight alloy; Scalmalloy is the higher-strength scandium-aluminium grade for performance-critical aerospace and motorsport parts.
Stainless 316L / 17-4 PH / 15-5 PH
Corrosion-resistant and precipitation-hardened stainless across marine, food-contact, and industrial work. 17-4 PH and 15-5 PH reach ~40 HRC after H900 heat treat.
CuCrZr (Copper alloy)
Headline material for rocket-engine cooling channels — combines high thermal conductivity with the hardenability needed for combustion-chamber service.
Tool Steels (H13, M300 / 1.2709 maraging)
Conformal-cooled mould inserts and high-strength tooling. Maraging steel age-hardens to 50–55 HRC.
When to choose an SLM provider over DMLS, LPBF, or EBM
SLM vs DMLS / LPBF: functionally the same process — pick on machine platform and quality system, not branding. SLM-platform shops tend to have an edge on multi-laser large-format builds (SLM 500 / 800 / NXG XII 600); EOS-platform DMLS shops tend to have deeper validated parameter libraries on legacy alloys like MS1 maraging. For most parts under 250 mm in standard alloys, the choice comes down to lead time, price, and quality flow-downs rather than the brand of machine.
SLM vs EBM: SLM gives finer surface finish, broader material range, and higher throughput on most alloys. EBM is the right call only for thick-section titanium where the 700°C+ vacuum chamber reduces residual stress, or for pure-titanium implants where alpha-case formation must be avoided.
SLM vs investment casting: SLM becomes economic against investment casting once geometric complexity (internal channels, lattice structures, consolidated assemblies) drives down the casting yield, or volume drops below ~200 units per year. Above ~500 units of geometrically simple parts, casting still wins on per-part cost.
Lead time and cost expectations for SLM
First-article SLM parts in standard alloys typically deliver in 2–4 weeks with stress relief and basic finishing. Add 1–2 weeks for HIP, double-stage heat treat, or 5-axis CNC of mating surfaces. Multi-laser machines compress build time substantially on tall parts: an NXG-class build that fills the envelope can deliver 3–4× the volume per day of a single-laser equivalent.
Indicative pricing for a 100 cm³ Ti-6Al-4V part (single, supported, basic stress relief): £900–£1,400 / €1,050–€1,650 on a single-laser machine, dropping ~30% on multi-laser large-format builds when nesting fills the plate. Inconel 718 runs roughly 1.3× titanium pricing due to powder cost and slower scan strategies; AlSi10Mg runs roughly 0.5×.
Related processes & materials
Frequently asked questions
Is SLM the same as LPBF and DMLS?
Yes — they describe the same fundamental process. "SLM" was originally trademarked by SLM Solutions, "DMLS" by EOS, and "LPBF" (Laser Powder Bed Fusion) is the ISO/ASTM 52900 vendor-neutral term. For sourcing, treat them as interchangeable — what matters is the machine platform, alloy parameter set, post-processing chain, and quality system the provider operates.
What machines do SLM providers typically run?
Nikon SLM Solutions hardware: the SLM 280 (280 × 280 × 365 mm) is the workhorse single- or twin-laser platform; the SLM 500 (500 × 280 × 365 mm) runs four lasers; the SLM 800 (500 × 280 × 850 mm) is the tall-build production system; and the NXG XII 600 (600 × 600 × 600 mm) runs twelve 1 kW lasers in parallel for high-throughput large-format work.
How does SLM's multi-laser approach affect part quality?
Multi-laser machines partition the layer between lasers and stitch the scan paths together. Modern SLM platforms have well-developed laser-overlap strategies, and density / mechanical properties match single-laser builds when the parameter set is properly qualified. Critical applications usually require first-article CT scanning to verify there are no stitch-line defects.
What surface finish should I expect from SLM?
As-built surface roughness is typically 6–12 µm Ra on vertical walls and 20+ µm Ra on down-facing surfaces, similar to DMLS and other LPBF processes. Critical surfaces are CNC-finished, polished, or vibratory-finished after print. For functional prototypes a media-blasted finish is usually sufficient.
Do SLM parts need HIP?
For fatigue-critical applications — aerospace structurals, rocket engines, medical implants — yes. HIP closes residual gas porosity and lifts properties from "as-built" to wrought-equivalent. For non-fatigue-critical parts (housings, brackets, manifolds with stress safety factors) HIP is often optional, and stress relief alone is enough.