What is 439 Stainless Steel?
439 stainless steel is a high-performance alloy used in various industrial applications. This comprehensive guide covers chemical composition, mechanical properties, and machining characteristics per ASTM A240 standard.
Chemical Composition
| Element | Content (%) | Standard |
|---|---|---|
| C | ≤0.03 | ASTM/GB |
| Mn | ≤1.00 | ASTM/GB |
| P | ≤0.04 | ASTM/GB |
| S | ≤0.03 | ASTM/GB |
| Si | ≤1.00 | ASTM/GB |
| Cr | 17.0-19.0 | ASTM/GB |
| Ti | ≥0.20+4(C+N) | ASTM/GB |
| Fe | Balance | ASTM/GB |
Mechanical Properties
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥415 MPa | ASTM A240 |
| Yield Strength (0.2% offset) | ≥275 MPa | ASTM A240 |
| Elongation (in 50mm) | ≥20% | ASTM A240 |
| Hardness (Vickers) | ≤200 HV | ASTM E384 |
| Density | 7.70 g/cm³ | At 20°C |
Key Features
- Excellent corrosion resistance in various environments
- Good mechanical properties for structural applications
- Suitable for CNC machining with proper parameters
- Widely used in industrial manufacturing
- Heat treatable for enhanced properties
Common Applications
- CNC machined precision parts
- Industrial equipment components
- Marine and offshore applications
- Automotive and aerospace industries
- Food processing equipment
- Medical devices and surgical instruments
Machinability & CNC Processing
439 stainless steel has moderate machinability. Recommended parameters:
| Parameter | Recommended Value |
|---|---|
| Cutting Speed (Vc) | 60-100 m/min (Carbide tools) |
| Feed Rate (f) | 0.1-0.25 mm/rev |
| Depth of Cut (ap) | 0.5-2.0 mm |
| Tool Material | Carbide (YG6/YG8) with TiAlN coating |
| Coolant | Soluble oil or synthetic coolant |
Why Choose Us for 439 Parts?
At CNC Machining Factory, we specialize in precision stainless steel machining:
- ✅ Material expertise with ASTM/GB/T standards
- ✅ Advanced 3/4/5-axis CNC equipment
- ✅ ISO 9001 certified quality control
- ✅ Fast turnaround: 3-5 days prototype
- ✅ Competitive factory pricing
- ✅ Full material certification available
Need a quote for 439 stainless steel parts? Contact us today with your drawings!
Related Articles
- 304 vs 316 Stainless Steel: Complete Comparison
- CNC Machining Stainless Steel: Best Practices
- Stainless Steel Grade Selection Guide
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