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303 Stainless Plate
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303 stainless steel plate is a free-machining austenitic stainless steel developed from 304 stainless steel. Its main feature is improved machinability achieved by adding sulfur, making it ideal for high-speed machining and precision component production.
Compared with 304, 303 sacrifices some corrosion resistance and weldability in exchange for much better machining efficiency.
Chemical Composition of 303 Stainless Steel
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 8.0 – 10.0 |
| Carbon (C) | ≤ 0.15 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Sulfur (S) | ≥ 0.15 (added for machinability) |
| Phosphorus (P) | ≤ 0.20 |
| Iron (Fe) | Balance |
Key Feature
The added sulfur content (S) improves chip breaking during machining, significantly enhancing cutting performance.
303 vs 304 Stainless Steel – Key Comparison
| Feature | 303 Stainless Steel | 304 Stainless Steel |
|---|---|---|
| Machinability | Excellent | Moderate |
| Corrosion Resistance | Good | Very Good |
| Weldability | Poor | Good |
| Strength | Similar | Similar |
| Free-Machining Additive | Sulfur (S) | None |
| Application Focus | Machined parts | General use |
Key Properties of 303 Stainless Steel Plate
1. Excellent Machinability
- Designed for high-speed CNC machining
- Reduces tool wear and production cost
- Ideal for mass production of precision parts
2. Good Mechanical Strength
- Similar strength to 304 stainless steel
- Suitable for structural and mechanical components
3. Moderate Corrosion Resistance
- Performs well in mild environments
- Not suitable for marine or high-chloride conditions
4. Limited Weldability
- Sulfur reduces weld performance
- Not recommended for welded structures
Common Applications of 303 Stainless Steel Plate
1. Precision Machined Components
- Screws and bolts
- Nuts and fasteners
- Shafts and bushings
2. Mechanical and Industrial Parts
- Valve components
- Gear parts
- Pump fittings
- Bearing housings
3. Electrical and Instrument Industry
- Precision instrument parts
- Electrical connectors
- Mechanical housings
4. Automotive Industry
- Engine components
- Transmission parts
- Precision machined fittings
Advantages of 303 Stainless Steel Plate
- Outstanding machinability
- Ideal for automated production
- Good dimensional stability
- Cost-efficient for machining processes
- Suitable for mass manufacturing
Limitations Compared to 304
- Lower corrosion resistance
- Poor weldability
- Not suitable for harsh environments
- Limited structural applications
Teda Ganghua – Supply Capability
Teda Ganghua supplies 303 stainless steel plates with stable quality and machining support:
- Multiple thickness and size options
- CNC-ready material supply
- Precision cutting and fabrication services
- Strict quality inspection system
- Export packaging and logistics support
With strong processing capability, Teda Ganghua provides reliable stainless steel solutions for precision machining industries.
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TIANJIN TEDA GANGHUA
Tel: +86 22 86896631
Phone: +86 15822676888
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