Stainless Steel 304 vs 316: Complete CNC Machining Comparison
304 stainless steel is the cost-effective workhorse suitable for most corrosion-resistant applications. 316 adds molybdenum for superior resistance to chlorides and marine environments, essential for medical, marine, and chemical processing applications.
Side-by-Side Property Comparison
| Property | Stainless Steel 304 | Stainless Steel 316 |
|---|---|---|
| Tensile Strength | 515 MPa (75 ksi) | 515 MPa (75 ksi) |
| Yield Strength | 205 MPa (30 ksi) | 205 MPa (30 ksi) |
| Hardness | 201 HB | 217 HB |
| Density | 8.00 g/cm³ | 8.00 g/cm³ |
| Machinability Rating | 45/100 | 36/100 |
| Thermal Conductivity | 16.2 W/m·K | 16.3 W/m·K |
| Melting Point | 1,400–1,450 °C | 1,370–1,400 °C |
| Tolerance | ±0.02 mm | ±0.02 mm |
Key Differences
| Property | Stainless Steel 304 | Stainless Steel 316 | Winner |
|---|---|---|---|
| Chloride Resistance | Moderate | Excellent | Stainless |
| Machinability | 45/100 | 36/100 | Stainless |
| Cost | ~$2.50/lb | ~$3.50/lb | Stainless |
| Marine Suitability | Poor | Excellent | Stainless |
| Biocompatibility | Good | Excellent (316L) | Stainless |
| General Corrosion | Excellent | Superior | Stainless |
Which Material Should You Choose?
Choose Stainless Steel 304 when:
- General-purpose corrosion-resistant parts
- Food processing equipment
- Architectural hardware
- Budget-conscious projects
- Indoor or mild environments
Choose Stainless Steel 316 when:
- Marine environments with saltwater exposure
- Medical devices and surgical instruments
- Chemical processing with chlorides
- Pharmaceutical equipment
- Oil and gas applications
Not Sure Which Material to Choose?
Our engineers can recommend the best material for your application. Upload your design for a free consultation.
Get a Free Quote