Key Characteristics & Performance
- Superior Machinability:Sulfur content (≥0.15%) enables faster machining speeds, reduced tool wear, and better chip breaking compared to standard SS304.
- Corrosion Resistance:Maintains good resistance to mild atmospheric conditions and oxidizing acids, though slightly less than SS304 due to sulfur content.
- Non-Magnetic:Austenitic structure provides minimal magnetism in annealed condition.
- Mechanical Properties:Tensile strength: 500-700 MPa; Yield strength: 190 MPa min.
- Heat Treatment:Cannot be hardened by heat treatment - best used in annealed condition.
Chemical Composition (Mass Fraction %)
|
Grade
|
Chemical composition (mass fraction) % |
||||||
|
C |
Si |
Mn |
P |
S |
Ni |
Cr |
|
|
ss303 |
≤0.15 |
≤1.0 |
≤2.0 |
≤0.20 |
≥0.15 |
8.0-10.0 |
17.0-19.0 |
Available Forms
- Hot Rolled Round Bars:Diameter: 5mm-300mm
- Cold Finished Round Bars:Diameter: 3mm-100mm
- Forged Round Bars:Diameter: 50mm-500mm
SS303 Bright Bar (Precision Cold Drawn)
Our SS303 bright bars undergo additional cold drawing and polishing processes to achieve superior dimensional accuracy and surface finish (Ra ≤ 0.8μm).
Advantages:
- Tight tolerances: h9-h11
- Mirror-like surface finish
- Straightness: ≤0.3mm/m
- Ideal for shafts, fasteners, and precision components
SS303 Ground Bar (Precision Centerless Ground)
For applications requiring ultra-precise dimensions and finest surface finish, we offer SS303 ground bars with:
- Diameter tolerance: ±0.005mm
- Surface finish: Ra ≤ 0.4μm
- Straightness: ≤0.1mm/m
- Perfect for hydraulic cylinders, bearing races, and high-precision fittings
Processing Capabilities:
- Custom Cutting:Precision saw cutting to required lengths
- Centerless Grinding:For ultra-precise diameters
- Surface Polishing:Mirror, satin, or brushed finishes
- Threading: All standard and custom thread forms
Applications:
- Automotive:Shafts, bushings, fasteners
- Medical:Surgical instrument components
- Industrial: Valve stems, pump shafts, fittings
- Food Processing:Machinery components
Packaging:
- VCI paper wrapping for corrosion protection
- Plastic end caps for damage prevention
- Wooden crates for export shipments
- Custom packaging available
FAQ
Q: Why choose SS303 over SS304 for machining applications?
A: SS303 offers significantly better machinability (up to 25% faster machining speeds) while maintaining adequate corrosion resistance for many applications.
Q: Can SS303 be welded?
A: Not recommended for welding due to sulfur content which can cause hot cracking. For welded assemblies, consider SS304 or SS316.
Q: What is the difference between bright bars and ground bars?
A: Bright bars are cold drawn with good surface finish, while ground bars undergo additional centerless grinding for ultra-precise dimensions and finer finish.
Q: Do you provide certification with materials?
A: Yes, all materials come with full material test certificates (MTC) including chemical composition and mechanical properties.
Note:SS303 is not recommended for marine or high-chloride environments. For such applications, consider our free-machining SS316F grade.
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