Anti-Lock Brake System
430F is used where a high level of magnetic permeability is required. This derives from its fully ferritic structure. Its high level of machinability allows volume throughput of components.
Approximate Composition – 17% Cr, 0.15% minimum S (sulphur) (Exact composition ranges vary between EN and ASTM standards).
This grade combines the following characteristics:
- Fair pitting and crevice corrosion resistance
- “Soft” magnetic properties. Low coercivity giving reversibly magnetic properties in electromagnetic devices
- High magnetic permeability
- Excellent machinability
430F is the most common stainless steel grade used for electromagnetic devices. Although its magnetic properties are not as good as the iron-silicon alloys, where corrosion resistance is required, it provides an excellent combination of properties. The processing of the grade is also important to ensure the optimum microstructure. The test certificate includes details of the magnetic properties where applicable.
Applications which illustrate these features include:
Magnetic cores, solenoid valves, relays, fuel injection systems, anti-lock braking systems, electromagnetic pumps.