Process & Material
Maraging Steel Small Hole EDM Drilling Feasibility Review
Maraging Steel can be machined with Small Hole EDM when the geometry matches small through holes, deep holes, angled holes, cooling holes, vent holes, and start holes in hard or heat-resistant alloys. Maraging Steel is a low-carbon high-nickel steel strengthened by aging rather than carbon hardening; the supplied condition affects support, discharge energy, finishing, and inspection.
Quick Answer
Small Hole EDM is suitable for Maraging Steel when the feature is a small, deep, angled, cooling, vent, or start hole in conductive material. The supplied condition must be stated before tolerance and surface requirements are confirmed.
Key Material Decisions
How This Material Behaves
A low-carbon high-nickel steel strengthened by aging rather than carbon hardening. In Small Hole EDM, the supplied condition changes bore stability, breakthrough quality, wall finish, and the inspection plan for straightness and position.
Choosing the Right Condition
Choose Small Hole EDM for small through holes, deep holes, angled holes, cooling holes, vent holes, and start holes in hard or heat-resistant alloys. State the exact Maraging Steel condition, then set tolerance, finish, support, and inspection from the controlled feature rather than the whole part.
Risks to Manage
For Small Hole EDM, solution-treated and aged states have different stress and hardness behavior, especially on precision thin sections. The far end of the hole can drift even when the entry diameter and start position remain stable during the final portion of a high-aspect-ratio hole; acceptance must focus on fatigue-loaded edges and free-state datums. On Maraging Steel, the resulting defect can be exit-position error together with recast or cracking on a fatigue-loaded wall. For Maraging Steel, balance material removal, use lower-energy finishing, and state the allowable recast or microcrack condition on service edges. Control electrode staging and confirm exit position rather than accepting the entry diameter alone; document free-state geometry, recast and the fatigue-critical edge condition for Maraging Steel.
How Small Hole EDM Works on Maraging Steel
Small Hole EDM advances a rotating tubular electrode through Maraging Steel while dielectric exits at the cutting tip. Electrode wear, runout, internal flushing, true hole depth and breakthrough support control entry-to-exit diameter, taper, straightness and wall condition. Hole diameter, depth and depth-to-diameter ratio—not stock thickness alone—define the process limit.
Small Hole EDM Capability Reference
| What you're asking | What you can expect |
|---|---|
| Feature types | small through holes, deep holes, angled holes, cooling holes, vent holes, and start holes in hard or heat-resistant alloys |
| Tolerance | ±0.010–0.050 mm |
| Surface finish | Hole-wall finish is feature-dependent |
| Typical diameter | About 0.3–3.0 mm for ordinary planning |
| Depth driver | Depth-to-diameter ratio, straightness, and breakthrough |
| Main limitation | Very small diameter combined with extreme depth may require specialized equipment, staged electrodes, and dedicated metrology. |
Material Condition Reference
| Condition | What to expect | Watch out for | Surface notes |
|---|---|---|---|
| solution annealed | Use economical roughing with stable support. | Soft sections can mark, bow, or release machining stress. | Protect exposed EDM faces from corrosion and reserve fine finishing for functional areas. |
| aged condition | Sequence rough and finish cuts around the datum scheme. | Residual stress can move thin walls or narrow webs. | Use lower-energy finishing on fatigue and wear faces. |
| stress-relieved finished condition | Use conservative energy and stress-aware fixturing. | Hard edges can microcrack and retain a deeper white layer. | Apply trim passes or recast removal where fatigue or wear matters. |
How This Material Behaves
Maraging steel gains very high strength from aging rather than high carbon content. In EDM, this means the solution-treated and aged conditions can differ in hardness, residual stress, and recast response, while fatigue-critical edges remain sensitive to a brittle resolidified layer. State the aging condition, finish after major stress changes are complete, and remove or limit recast on load-bearing surfaces. For Small Hole EDM, solution-treated and aged states have different stress and hardness behavior, especially on precision thin sections. In deep holes, exit position and wall integrity must be controlled together because residual stress and electrode wear can shift the path.
Surface Integrity and Post-Process
For Small Hole EDM on Maraging Steel, critical fatigue surfaces benefit from lower-energy finishing and a clear recast-layer requirement. Reduce discharge energy near final size and breakthrough, then evaluate entry, exit, taper and wall condition separately. For fatigue-, flow- or seal-critical holes, specify recast acceptance or post-process cleaning and finishing instead of relying on diameter alone.
Maraging Steel Small Hole EDM Checkpoints
- Confirm that the feature matches small through holes, deep holes, angled holes, cooling holes, vent holes, and start holes in hard or heat-resistant alloys.
- State the supplied condition: solution annealed, aged condition, and stress-relieved finished condition.
- Mark the controlled dimensions, functional surfaces, datum scheme, and inspection method.
Typical Parts and Features
- high-strength inserts
- shafts and profiles
- fixtures
- turbine-blade cooling holes
- mold and die vent holes
- injector and nozzle holes
Limits and Better Alternatives
Main Limit
Hole depth, diameter, aspect ratio, flushing, and breakthrough quality—not stock thickness alone—set the practical limit. On Maraging Steel, solution-treated and aged states have different stress and hardness behavior, especially on precision thin sections; the supplied condition still controls support, finishing, and surface-integrity review.
Consider Another Route When
Use mechanical drilling when the tool can reach economically, laser drilling for suitable thin geometry, or Micro EDM for smaller precision holes.
Practical Next Step
Send the Maraging Steel drawing with condition, controlled geometry, tolerance, functional surface callouts, quantity, and inspection requirements. If the route is unclear, we will compare Small Hole EDM with the adjacent EDM or conventional process.
Practical Takeaway
Maraging Steel is compatible with Small Hole EDM when the feature matches the process access. The supplied condition determines support, finishing, surface control, and inspection.
Additional Project Information
Include application, destination and end-use notes together with the material, quantity and drawing requirements.
Project Details for Technical Review
Include application and end-use notes when they affect material, inspection, documentation, or export review.
- Process: Small Hole EDM
- Material: Maraging Steel
- Drawing or part sketch
- Material grade
- Thickness / part size
- Quantity
- Tolerance and critical dimensions
- Surface finish or inspection requirement
STEP/STP, DXF, DWG, PDF, IGS/IGES or ZIP.
Confidential drawing review. NDA support available on request.
Frequently Asked Questions
Can Maraging Steel be machined with Small Hole EDM?
Yes, when the feature is a small, deep, angled, cooling, vent, or start hole in conductive material. Maraging Steel is electrically conductive and the final route follows the feature geometry and supplied condition.
What controls Small Hole EDM on Maraging Steel?
The main process controls are electrode diameter, true hole depth, depth-to-diameter ratio, tubular-electrode wear, flushing pressure, breakthrough quality, and hole-wall inspection. The Maraging Steel condition adds dimensional-stability and surface-integrity requirements.
What is the main risk?
For Small Hole EDM, solution-treated and aged states have different stress and hardness behavior, especially on precision thin sections. The far end of the hole can drift even when the entry diameter and start position remain stable during the final portion of a high-aspect-ratio hole; acceptance must focus on fatigue-loaded edges and free-state datums. On Maraging Steel, the resulting defect can be exit-position error together with recast or cracking on a fatigue-loaded wall. For Maraging Steel, balance material removal, use lower-energy finishing, and state the allowable recast or microcrack condition on service edges. Control electrode staging and confirm exit position rather than accepting the entry diameter alone; document free-state geometry, recast and the fatigue-critical edge condition for Maraging Steel.
What should I send for review?
Send the drawing, exact Maraging Steel condition, controlled geometry, tolerance, functional surface requirements, quantity, and inspection expectations. If any item is undecided, send what you have and we will help complete the review.