Peeled Round Bars / Stainless Steel
AISI 303
Free Machining Austenitic Stainless Steel
Material Overview
AISI 303 - Free Machining Stainless Steel
Material Type
Type: Austenitic, non-magnetic in annealed condition
Key Benefit: Highest machinability among all austenitic grades
Chemistry Highlights
- Higher sulfur content (0.15-0.35%) for improved machinability
- Chromium-nickel base for corrosion resistance
- Free-machining additives for excellent chip breaking
Corrosion Resistance
Good corrosion resistance, slightly lower than 304 due to sulfur additions. Suitable for atmospheric exposure and mild chemical environments.
Mechanical Properties
| Tensile Strength: | 600-750 MPa |
| Hardness: | 180-220 HB |
| Machinability: | Excellent (Best in class) |
Applications
- High-speed machining parts and precision turned components
- Fittings, fasteners, and threaded components
- Precision gears for food and pharmaceutical equipment
- Valve components and pump parts
- Aircraft fittings and hardware
- Automatic screw machine products
Advantages
- Superior Machinability: Fastest cutting speeds among austenitic stainless steels
- Excellent Surface Finish: Bright, smooth finish ideal for precision parts
- Good Formability: Can be cold worked and formed
- Non-Magnetic: Suitable for applications requiring non-magnetic properties
- Cost-Effective: Reduced machining time lowers production costs
Processing Characteristics
- Welding: Can be welded but not recommended for critical applications
- Heat Treatment: Cannot be hardened by heat treatment
- Cold Working: Work hardens moderately during forming
- Machining: Excellent chip breaking and tool life