What is 440B Stainless Steel?
440B 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 | 0.37-0.45 | ASTM/GB |
| Mn | 0.50-0.80 | ASTM/GB |
| P | ≤0.035 | ASTM/GB |
| S | ≤0.035 | ASTM/GB |
| Si | 0.17-0.37 | ASTM/GB |
| Fe | Balance | ASTM/GB |
Mechanical Properties
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥760 MPa | ASTM A240 |
| Yield Strength (0.2% offset) | ≥450 MPa | ASTM A240 |
| Elongation (in 50mm) | ≥14% | ASTM A240 |
| Hardness (Vickers) | ≤270 HV | ASTM E384 |
| Density | 7.75 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
440B 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 440B 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 440B stainless steel parts? Contact us today with your drawings!
