HOW TO CHOOSE THE RIGHT CARBIDE GRADE FOR STAINLESS STEEL TURNING
Optimization Strategies for ISO M-Class Machining
Machining stainless steel (ISO M) is notoriously difficult due to its high toughness, low thermal conductivity, and rapid work-hardening. Selecting the wrong carbide grade leads to premature chipping, built-up edge (BUE), and high scrap rates.
1. The PVD vs. CVD Coating Dilemma
For stainless steel, the coating is your first line of defense against heat. Most BEYOND® inserts utilize one of these two technologies:
PVD Coating (VP15TF)
Best for Finishing: Thin, sharp coatings that prevent work-hardening. Ideal for precision 300-series stainless steel where surface finish is critical.
CVD Coating (US735)
Best for Roughing: Thick thermal barriers that handle the high heat generated during heavy material removal or interrupted cuts.
2. Selection Matrix by Application
| Operation Type | Recommended Grade | Key Feature |
|---|---|---|
| High Speed / Finishing | MP7035 / VP15TF | Ultra-sharp edge, BUE resistance |
| General Purpose | US735 | Balanced wear & toughness |
| Heavy Interrupted Cut | MC7025 | High impact resistance |
3. Solving Built-Up Edge (BUE)
One of the biggest issues in stainless machining is the material welding itself to the insert. To prevent this:
- Increase Cutting Speed (Vc): Higher speeds generate enough heat to soften the chip but move it off the tool quickly.
- Use Sharp Chipbreakers: Choose -FM or -EF geometries for light-depth cuts to ensure the material is "sliced" rather than pushed.
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