2017 aluminum alloy is a heat-treatable wrought alloy belonging to the Al-Cu-Mg series (similar to AA2017). It offers an excellent balance of high strength, good machinability, and moderate corrosion resistance, making it a preferred material for precision CNC machined components in aerospace, automotive, and industrial equipment. At Dongguan Stirling Metal Products Co., Ltd., we combine deep metallurgical knowledge with advanced CNC machining capabilities to deliver parts that meet the most demanding specifications.
Introduction
2017 aluminum alloy is one of the earliest high-strength aluminum alloys developed, with a history dating back to the 1920s. It is often referred to as “duralumin” due to its superior strength-to-weight ratio. The alloy is solution heat-treated and naturally aged to achieve its mechanical properties. Unlike 6061 or 7075, 2017 offers a unique combination of high shear strength and excellent chip formation during machining, which reduces tool wear and cycle times. Its typical density is 2.79 g/cm³, and it has a melting range of 510–640°C. For CNC machining service providers, understanding the nuances of 2017 is critical to optimizing cutting parameters and achieving tight tolerances.
Chemical Composition
The precise chemical composition of 2017 aluminum alloy is defined by international standards such as ASTM B221 and EN 573-3. The nominal composition ranges (by weight percent) are as follows:
| Element | Composition Range (%) |
|---|---|
| Aluminum (Al) | Balance (87.2 – 94.7) |
| Copper (Cu) | 3.5 – 4.5 |
| Magnesium (Mg) | 0.40 – 0.80 |
| Manganese (Mn) | 0.40 – 1.0 |
| Silicon (Si) | 0.20 – 0.80 |
| Iron (Fe) | 0.70 max |
| Zinc (Zn) | 0.25 max |
| Titanium (Ti) | 0.15 max |
| Other (each) | 0.05 max |
| Other (total) | 0.15 max |
Copper is the primary alloying element, providing significant strengthening through precipitation hardening. Magnesium and manganese further enhance strength and improve workability. The controlled iron content ensures good ductility, while silicon aids in fluidity during casting. For CNC machining, the copper content contributes to the formation of short, broken chips, which is advantageous for automated machining centers. Always request a material certificate (EN 10204 3.1) from your supplier to verify composition.
Mechanical Properties
2017 aluminum alloy is typically supplied in the T4 temper (solution heat-treated and naturally aged). The mechanical properties are highly dependent on the temper and section thickness. Typical values for 2017-T4 are:
| Property | Metric Value | Imperial Value |
|---|---|---|
| Ultimate Tensile Strength (UTS) | 390 – 430 MPa | 56,600 – 62,400 psi |
| Yield Strength (0.2% offset) | 240 – 280 MPa | 34,800 – 40,600 psi |
| Elongation at Break | 10 – 20% | 10 – 20% |
| Shear Strength | 260 – 290 MPa | 37,700 – 42,100 psi |
| Hardness (Brinell) | 105 – 120 HB | 105 – 120 HB |
| Modulus of Elasticity | 71 – 73 GPa | 10.3 – 10.6 × 10⁶ psi |
| Fatigue Strength (10⁷ cycles) | 125 – 140 MPa | 18,100 – 20,300 psi |
Compared to 6061-T6 (UTS ~310 MPa), 2017-T4 offers approximately 25–30% higher tensile strength. However, its corrosion resistance is lower, so protective coatings or anodizing are recommended for outdoor applications. The alloy maintains good toughness even at cryogenic temperatures, making it suitable for aerospace structural components.
CNC Machining Parameters
2017 aluminum alloy is classified as having excellent machinability, with a rating of 90% relative to free-cutting brass (100%). Its chip formation is short and discontinuous, which minimizes built-up edge and allows for high cutting speeds. Below are recommended CNC machining parameters for common operations using carbide tooling:
| Operation | Cutting Speed (m/min) | Feed Rate (mm/rev) | Depth of Cut (mm) | Coolant |
|---|---|---|---|---|
| Rough Turning | 300 – 500 | 0.20 – 0.40 | 2.0 – 5.0 | Water-soluble emulsion (5–8%) |
| Finish Turning | 400 – 600 | 0.05 – 0.15 | 0.2 – 0.5 | Mist or flood coolant |
| Face Milling | 500 – 800 | 0.10 – 0.25 mm/tooth | 1.0 – 3.0 | Flood coolant recommended |
| Drilling (HSS) | 50 – 80 | 0.10 – 0.20 | N/A | High-pressure coolant for chip evacuation |
| Drilling (Carbide) | 100 – 150 | 0.15 – 0.30 | N/A | Through-spindle coolant preferred |
| Threading (Carbide insert) | 100 – 200 | 0.05 – 0.10 per pass | N/A | Oil-based lubricant |
Key machining considerations:
- Use sharp, polished carbide inserts with a positive rake angle to reduce cutting forces and prevent work hardening.
- For tight tolerances (±0.01 mm), allow the workpiece to cool to room temperature before final finishing passes to avoid thermal expansion errors.
- Surface finish achievable: Ra 0.4 – 0.8 µm with proper finishing parameters.
- Chip control: The alloy produces short, helical chips; use chip breakers on inserts for automated chip removal.
- For thin-walled parts, reduce depth of cut and use step-over strategies to minimize vibration.
Applications
Due to its high strength and machinability, 2017 aluminum alloy is widely used in the following industries and components:
- Aerospace: Structural brackets, fittings, ribs, and interior components (non-critical stress parts).
- Automotive: Engine mounts, transmission housings, suspension components, and custom CNC-machined prototypes.
- Mechanical Manufacturing: Gears, pulleys, shafts, jigs, and fixtures requiring high wear resistance.
- CNC Machined Parts: Precision turned and milled components for robotics, medical devices, and electronics enclosures.
- Industrial Equipment: Hydraulic manifolds, valve bodies, and pump components where strength and dimensional stability are critical.
- Defense: Ordnance components, weapon system mounts, and military vehicle parts.
Quality Control
At Dongguan Stirling Metal Products Co., Ltd., we implement a rigorous quality control protocol for every 2017 aluminum alloy project:
- Incoming Material Inspection: Verification of chemical composition via Optical Emission Spectrometry (OES) and mechanical property testing (tensile, hardness) per ASTM E8/E18.
- In-Process Inspection: Dimensional checks using CMM (Coordinate Measuring Machine) with accuracy ±0.002 mm at critical features.
- Surface Finish Measurement: Profilometer testing to ensure Ra values meet customer specifications (typically 0.4 – 1.6 µm).
- Non-Destructive Testing (NDT): Dye penetrant inspection for surface cracks on high-stress components; ultrasonic testing for internal defects when required.
- Final Inspection: 100% dimensional check for first articles; AQL sampling per ISO 2859 for batch production.
- Certification: Full material traceability with EN 10204 3.1 mill certificates and inspection reports.
Why Choose Us
Dongguan Stirling Metal Products Co., Ltd. is your trusted partner for 2017 aluminum alloy CNC machining. With over 15 years of experience, we combine material science expertise with state-of-the-art 5-axis CNC machining centers (Mazak, DMG MORI) to deliver parts with tolerances as tight as ±0.005 mm. Our team of certified engineers provides DFM (Design for Manufacturability) feedback to optimize your designs for cost and performance.
- ✅ Material Procurement: Genuine 2017-T4/T6 sourced from certified mills (Alcoa, Constellium), with full material certificates and traceability.
- ✅ CNC Machining: Precision ±0.01 mm standard, ±0.005 mm on request; surface finishes down to Ra 0.2 µm.
- ✅ Sample Making: Fast delivery in 3-5 days for prototypes; iterative design support included.
- ✅ Batch Production: Delivery in 7-15 days for production runs; JIT (Just-In-Time) scheduling available.
- ✅ Post-Processing: Anodizing (Type II/III), powder coating, passivation, and assembly services.
For a free quote, please Contact Us! Our engineering team is ready to review your 2017 aluminum alloy project and provide a competitive quotation within 24 hours.
