Video
Todd DunningMSUnited States
Optical materials for industrial photonics systemsPublished
Jan 6, 2026
Hastelloy Laser Cleaning
The beam removes weld heat tint and surface oxide from this nickel-chromium-molybdenum grade, clearing the coupon before acid pickling or media blasting would touch the corrosion-resistant surface. The Ni-Cr-Mo composition resists chloride and acid attack rather than forming the flaking iron oxide that builds on carbon steel, so cleaning targets a thin passivation layer, not a rust job. Hastelloy is not Inconel: Inconel's nickel-chromium-iron makeup targets high-temperature oxidation resistance, while Hastelloy's molybdenum content is built for wet corrosive service, and each alloy carries a different heat-tint color and thickness that changes beam settings. The process also skips electroplated nickel finishes, since a plated layer sits on a different substrate and needs a plating-safe approach instead. Shops reach for it ahead of orbital welding or passivation testing, where residual weld heat tint would compromise the corrosion resistance the alloy is specified for.
Steps and considerations when laser cleaning Hastelloy
Hastelloy cleaning on the bench starts with a grade call on corrosion-resistant nickel superalloy stock, metal dust controls at the head, and a staged coupon map before production energy rises. Polymer recipes stay off this metal path until that call is done (PMC laser-controlled coating removal review).
1Confirm grade and reject wrong films
- Record Hastelloy grade and alloy notes before setup, C-276 and other corrosion grades do not share the same coupon map as Inconel turbine stock.
- Polymer or organic cleaning recipes rule out this nickel path; stop and open a fresh coupon plan instead of copying them.
2Stage metal dust capture
- Treat Hastelloy cleaning as particulate work under OSHA Table Z-1 and California Title 8 section 5155 framing.
- Run local exhaust at the head before the first coupon pass, not after oxide starts lifting.
3Coupon, then freeze the map
- Raise energy in small steps on scrap until acid-service oxide or weld tint lifts without marking bare metal, then lock that map for production.
- Compare with nickel laser cleaning when the substrate call matches commercially pure nickel stock.
- Compare with Inconel laser cleaning when high-temperature superalloy hardware is on the bench instead of wet-process Hastelloy.
Sources(1 reference)
- Research Progress and Challenges in Laser-Controlled Coating Removal pmc.ncbi.nlm.nih.gov (opens in new tab) — staged laser coating removal on metal substrates
Common questions when laser cleaning Hastelloy
What dust rules apply for Hastelloy laser cleaning?
Hastelloy laser cleaning still counts as metal particulate work under OSHA Table Z-1 and California Title 8 section 5155. Source capture at the head stays on even when the beam path is dry.
Can Hastelloy use the same settings as Inconel?
Hastelloy often needs higher first-pass energy than Inconel because acid-service oxide absorbs differently than turbine heat tint. Grade and coating class still need their own coupon map before production copies superalloy settings.
When should operators stop raising energy on Hastelloy?
Bare metal color change or new roughness on corrosion-resistant stock means pausing the job. Inspect the test piece and reduce beam energy before the next scan (Sage ns laser surface treatment review).
Sources(1 reference)
- The theory and application of nanosecond Laser surface treatment technology: A review journals.sagepub.com (opens in new tab) — staged energy control on metal laser cleaning
How Hastelloy takes a laser pass
Hastelloy laser interactions at 1064 nanometers depend on how acid-service oxide and chromate film leave before bare nickel superalloy marks. Light absorption near 0.42 on charted stock means the face takes a moderate share of each pulse, while service scale from wet-process duty absorbs more strongly than the polished base (MatWeb material property data). Oxide and chemical-service deposits usually leave near 1.2 to 1.7 joules per square centimeter on coupon work (Surface and Coatings Technology turbine cleaning study). Charted metal injury on this page sits near 2.8 joules per square centimeter, tighter than nickel but giving enough room to clear NiO and MoO3 scale before the corrosion-resistant face tints. Thermal conductivity near 9.8 watts per meter kelvin keeps heat local on C-276 hardware, yet overlap and line speed still need inspection so the passive film stays intact after cleaning (Sci. Rep. 2024).
Sources(3 references)
- MatWeb Material Property Data — Online Materials Information Resource matweb.com (opens in new tab) — hastelloy absorptivity near 0.42 at 1064 nm
- Laser cleaning process of high-pressure turbine blade: Characterization and removal of surface contaminants, Surface and Coatings Technology, 2023 sciencedirect.com (opens in new tab) — nickel superalloy oxide cleaning fluence
- Nanosecond pulsed laser ablation of Inconel 718, Sci. Rep. 2024, s41598-024-81233-0 doi:10.1038/s41598-024-81233-0 (opens in new tab) — 8–20 J/cm² nickel-family metal injury band
Material properties that matter when laser cleaning Hastelloy
Charted Hastelloy for this page carries about 690 megapascals tensile strength and roughly 8,890 kilograms per cubic meter density (MatWeb material property data). The stock is a nickel-chromium-molybdenum superalloy chosen for pitting and crevice corrosion resistance in acid and chloride service, denser and stiffer than aluminum peers but conducting heat more slowly than nickel in the same bay. Thermal conductivity near 9.8 watts per meter kelvin keeps energy local during oxide removal on C-276 hardware. Light absorption near 0.42 at 1064 nanometers means operators coupon rather than copying steel rust settings meant for a different absorption stack.
Sources(1 reference)
- MatWeb Material Property Data — Online Materials Information Resource matweb.com (opens in new tab) — 690 MPa tensile, 8890 kg/m³ density, 9.8 W/m·K conductivity
The production window when laser cleaning Hastelloy
Hastelloy on the specialty-alloy chart carries a tighter usable band than nickel because oxide lifts near 1.2 joules per square centimeter while charted metal injury sits near 2.8 joules per square centimeter. That leaves about 0.65 joules per square centimeter of room on this page, the narrowest spacing among specialty peers. Published nickel-family superalloy coupons still report an 8 to 20 joule per square centimeter injury span for short-pulse near-infrared work (Sci. Rep. 2024). Keep dust capture on for the whole dry job while energy stays in that span, and re-check the corrosion-resistant face before weld prep or coating follows.
- This material (highlighted)
- Other materials in this group
Sources(1 reference)
- Nanosecond pulsed laser ablation of Inconel 718, Sci. Rep. 2024, s41598-024-81233-0 doi:10.1038/s41598-024-81233-0 (opens in new tab) — 8–20 J/cm² nickel-family injury span
Cleaning parameters when laser cleaning Hastelloy
Hastelloy cleaning runs as two linked stages on the coupon. Acid-service oxide and weld heat tint usually leave near 1.2 to 1.7 joules per square centimeter before bare metal marks near 2.8 joules per square centimeter on charted work (Surface and Coatings Technology turbine cleaning study). One shared setting for both stages usually either leaves NiO and MoO3 scale or strips the corrosion-resistant passive film, so operators map a light first pass, inspect, then finish on the bright stock (Sci. Rep. 2024).
Sources(2 references)
- Laser cleaning process of high-pressure turbine blade: Characterization and removal of surface contaminants, Surface and Coatings Technology, 2023 sciencedirect.com (opens in new tab) — nickel superalloy service oxide cleaning near 1.2–1.7 J/cm²
- Nanosecond pulsed laser ablation of Inconel 718, Sci. Rep. 2024, s41598-024-81233-0 doi:10.1038/s41598-024-81233-0 (opens in new tab) — 8–20 J/cm² nickel-family injury span
Key facts when laser cleaning Hastelloy
Hastelloy facts on this chart cover corrosion-resistant nickel superalloy stock in the specialty alloy group. Charted tensile strength sits near 690 megapascals, density near 8,890 kilograms per cubic meter, and thermal conductivity near 9.8 watts per meter kelvin (MatWeb material property data). Short-pulse 1064 nanometer fiber sources are the usual class for this property set. See semiconductor tooling cleaning for field contexts that run the same metal.
| Parameter | Value |
|---|---|
| Canonical substrate | Inconel 625 / 718 envelope (nearest cited ns/1064 superalloy family) |
| Tensile strength | 690 MPa |
| Density | 8,890 kg/m³ |
| Typical wavelength | 1064 nm, pulsed |
Sources(1 reference)
- MatWeb Material Property Data — Online Materials Information Resource matweb.com (opens in new tab) — 690 MPa tensile, 8890 kg/m³ density, 9.8 W/m·K conductivity
Failure modes when laser cleaning Hastelloy
Hastelloy cleaning fails when grade notes get skipped or when metal capture is missing at the head. Wrong-class energy on unidentified nickel superalloy stock can mark the corrosion-resistant face before oxide is gone, and uncaptured nickel and molybdenum dust breaks exposure plans even when beam energy looked safe on the coupon (Surface and Coatings Technology turbine cleaning study) (Sci. Rep. 2024).
| Condition | Consequence |
|---|---|
| No local exhaust for nickel and molybdenum dust[1] | Crews breathe nickel-bearing particulate when capture is missing |
| Grade ignored before production[1] | Wrong-class energy or passive-film loss on unidentified Hastelloy stock |
| Single energy setting for oxide and bare metal[1] | Leftover acid-service scale or heat tint on the finished face |
Sources(1 reference)
- Laser cleaning process of high-pressure turbine blade: Characterization and removal of surface contaminants, Surface and Coatings Technology, 2023 sciencedirect.com (opens in new tab) — nickel superalloy oxide removal without substrate damage
Related videos
Standards and exposure limits for Hastelloy laser cleaning
Dry nickel superalloy laser cleaning raises nickel- and molybdenum-bearing dust that needs capture before the coupon pass. Federal limits sit in OSHA Table Z-1 (29 CFR 1910.1000 Table Z-1), California shops follow Title 8 section 5155 for nickel metal and nickel compounds, and Bay Area plumes must stay at Ringelmann No. 1 for no more than three minutes per hour (OSHA Table Z-1) (Cal/OSHA Title 8 §5155 airborne contaminants) (BAAQMD Regulation 6 particulate matter).
OSHA
View official documentation (opens in new tab)29 CFR 1910.1000 Table Z-1 frames nickel metal dust and fume exposure when dry laser cleaning runs without source capture at the head on Hastelloy stock.[1]
Cal/OSHA
View official documentation (opens in new tab)Title 8 section 5155 Table AC-1 still governs nickel metal and insoluble nickel compound exposure in California shops when laser cleaning raises oxide and metal particulate from nickel superalloy hardware.[2]
BAAQMD
View official documentation (opens in new tab)Regulation 6 limits visible emissions to Ringelmann No. 1 for no more than three minutes per hour on industrial plumes, so capture still matters on Bay Area Hastelloy cleaning work even when the beam stays dry.[3]
Sources(3 references)
- 29 CFR 1910.1000 Table Z-1 — Limits for Air Contaminants osha.gov (opens in new tab) — OSHA Table Z-1 nickel dust and fume framing
- Cal/OSHA Title 8 §5155 — Airborne Contaminants (Table AC-1) dir.ca.gov (opens in new tab) — Title 8 section 5155 nickel exposure tables
- BAAQMD Regulation 6 — Particulate Matter, Common Definitions and Test Methods baaqmd.gov (opens in new tab) — BAAQMD Regulation 6 visible emissions Ringelmann No. 1
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Precision Surfaces
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View details: Oxide Scale. Category: contaminants.Anneal and service heat grow a bonded oxide scale on [steel](/materials/steel-laser-cleaning), [stainless steel](/materials/stainless-steel-laser-cleaning), titanium, and Inconel that pulsed light separates through thermal expansion mismatch rather than grinding or acid pickling. What matters is each metal's own melt ceiling, chromium-bearing dust on stainless and Inconel, and a coupon-proven setting before the production part. Clearing scale is not the same as restoring corrosion resistance.
Metallic Surface Deposits
View details: Metallic Surface Deposits. Category: contaminants.Workpiece metal that pressure-welds onto a [tool steel](/materials/tool-steel-laser-cleaning) rake or a [carbide](/materials/tungsten-carbide-laser-cleaning) cutting edge comes off under pulsed light so the tool can cut again. What matters is telling the deposit from the tool itself, avoiding a nicked edge, and capturing metal dust as it leaves. Prove the pass on a spare tool first because the deposit and the host can share the same color and the same base metal.
Hard Coatings
View details: Hard Coatings. Category: contaminants.Thin hard wear films on [tool steel](/materials/tool-steel-laser-cleaning) and [carbide](/materials/tungsten-carbide-laser-cleaning) come off under pulsed light so an edge can take a new coat. What matters is not nicking the cutting edge, capturing cobalt-bearing dust from carbide, and proving the strip on a spare tool because these skins are thin and the host sits close underneath.
Organic Grease Oil
View details: Organic Grease Oil. Category: contaminants.Shop grease and oil sit on [steel](/materials/steel-laser-cleaning) and [aluminum](/materials/aluminum-laser-cleaning) as films that soak into surface roughness, then come off under pulsed light as heat breaks the hydrocarbon apart at the metal. What matters is leftover film that blocks a weld or a coat, smoke from the burned oil, and proving a water-break land on scrap before the production part. A wet degrease line is the other path this job replaces.