Material · Stainless Steels
Stainless Steel 17-4 PH
Stainless that hardens like tool steel: 1,310 MPa in H900 with minimal distortion.
Price index: $$$$
Material properties
| Parameter | Value |
|---|---|
| Tensile strength | 1310 MPa (H900) |
| Yield strength | 1170 MPa (H900) |
| Hardness | 40–44 HRC (H900) |
| Density | 7.75 g/cm³ |
Choose it when
When stainless must also be strong: machine near-final in soft Condition A, age at 482 °C with almost no distortion, and finish-grind only critical features — far simpler than quench-and-temper steels.
Look elsewhere when
Not a 316L substitute in chlorides, and H900 has reduced stress-corrosion resistance (use H1025+ in aggressive environments). For simple corrosion-only duty, 304 costs far less.
Compatible finishes
As-Machined
The baseline finish: straight off the machine, fastest and cheapest.
Passivation
Chemical hygiene for stainless: strips embedded iron so the steel can be as stainless as advertised.
Electropolishing
Reverse plating that brightens, deburrs and passivates stainless in one step.
Bead Blasting
The uniform matte look: erases tool marks, hides fingerprints, preps perfect anodizing.
Brushed Finish
The appliance-grade look: directional satin grain on panels, bezels and show faces.
Polishing
Progressive abrasives down to mirror: the finish for optics, molds and show surfaces.
Vibratory Tumbling
Batch deburring by the bowl-full: every edge broken, every burr gone, at volume prices.
Laser Marking
Permanent identification with zero dimensional change: serials, logos and codes burned in, not stuck on.
PTFE Coating (Teflon)
The slippery armor: fluoropolymer for low friction, non-stick release and chemical inertness.
Typical applications
- Pump and valve shafts
- Robot gearbox components
- Aerospace fasteners and fittings
- Loaded surgical instrument hinges
Compared with similar grades
| Property | Stainless Steel 17-4 PH | Stainless Steel 303 | Stainless Steel 304 | Stainless Steel 316L |
|---|---|---|---|---|
| Tensile strength | 1310 MPa (H900) | ~620 MPa (cold drawn) | 515 MPa | 485 MPa |
| Yield strength | 1170 MPa (H900) | ~415 MPa (cold drawn) | 205 MPa | 170 MPa |
| Hardness | 40–44 HRC (H900) | ≤228 HB | ≤201 HB | ≤217 HB |
| Density | 7.75 g/cm³ | 8.00 g/cm³ | 8.00 g/cm³ | 7.98 g/cm³ |
| Price index | $$$$ | $$$ | $$$ | $$$ |
| Machinability | 2/5 | 4/5 | 3/5 | 3/5 |
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