Stainless Steel 303 Round Bar (UNS S30300)
Stainless Steel 303 Round Bar (UNS S30300) is a free-machining austenitic stainless steel developed by adding sulfur to the 304 chemistry. This modification significantly improves machinability while retaining good corrosion resistance in mild environments. UNS S30300 round bars are widely used for high-speed machining applications where excellent surface finish, dimensional accuracy, and productivity are required.
Key Features
- Excellent machinability due to sulfur addition
- Good surface finish after machining
- Austenitic structure with good toughness
- Suitable for high-speed automatic machining
- Cost-effective for precision-machined components
Specification Table
| Parameter | Details |
|---|---|
| Product Form | Round Bar |
| Grade | Stainless Steel 303 |
| UNS Number | S30300 |
| Standard | ASTM A276 / ASTM A479 |
| Condition | Annealed / Cold Drawn |
| Finish | Bright, Polished |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | 303 |
| EN | 1.4305 |
| DIN | X8CrNiS18-9 |
| JIS | SUS 303 |
| AFNOR | Z8CNF18-09 |
Sizes
| Diameter Range | Length |
|---|---|
| 3 mm to 300 mm | 3 m, 6 m, or Custom Cut Lengths |
303 Round Bar Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.15 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 8.0 – 10.0 |
| Sulfur (S) | 0.15 – 0.35 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.20 |
| Iron (Fe) | Balance |
SS 303 Round Bar Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 228 HB |
UNS S30300 Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1400 – 1450°C |
| Thermal Conductivity | 16.2 W/m·K |
| Electrical Resistivity | 0.72 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of SS 303 Round Bar
- Cold Drawn Round Bar
- Bright Round Bar
- Centerless Ground Round Bar
- Polished Round Bar
Applications
- Precision machined components
- Shafts, studs, and fasteners
- Screws, nuts, and bolts
- Bushings and fittings
- Automotive and engineering parts
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