CNC Machining 3004 (AlMn1Mg1) — 3xxx Series Material
This article provides essential technical information about 3004 (AlMn1Mg1), a manganese-magnesium alloy from the 3xxx series, known for its excellent formability, moderate strength, and superior corrosion resistance. 3004 is widely used in sheet metal forming and structural applications, but it also offers good machinability for precision CNC parts requiring a balance of strength and ductility. Dongguan Stirling Metal Products Co., Ltd. specializes in machining 3004 for components in the beverage, automotive, and building industries.
Chemical Composition (ASTM B209 / EN 573-3)
| Element | Content (%) | Role |
|---|---|---|
| Aluminum (Al) | Balance (approx. 96.0 – 98.5) | Base metal |
| Manganese (Mn) | 1.00 – 1.50 | Primary strengthening element; improves corrosion resistance |
| Magnesium (Mg) | 0.80 – 1.30 | Secondary strengthening; improves formability |
| Iron (Fe) | ≤ 0.70 | Impurity; controlled for ductility |
| Silicon (Si) | ≤ 0.30 | Impurity |
| Copper (Cu) | ≤ 0.25 | Trace; minor strengthening |
| Zinc (Zn) | ≤ 0.25 | Trace |
| Titanium (Ti) | ≤ 0.10 | Grain refiner |
| Others (each) | ≤ 0.05 | – |
| Others (total) | ≤ 0.15 | – |
Mechanical Properties (Typical, H32 Temper)
| Property | Value | Standard (ASTM B209) |
|---|---|---|
| Tensile Strength (MPa) | 220 – 260 | ≥ 215 |
| Yield Strength (0.2% offset, MPa) | 170 – 210 | ≥ 165 |
| Elongation (%) | 10 – 18 | ≥ 8 |
| Hardness (HBW) | 55 – 70 | – |
| Shear Strength (MPa) | 140 – 160 | – |
| Modulus of Elasticity (GPa) | 69 | – |
| Fatigue Strength (MPa, 10^7 cycles) | ~90 | – |
CNC Machining Parameters
3004 is a soft, ductile alloy that machines similarly to 1100 but with slightly higher strength. Use sharp, polished carbide tools and moderate cutting speeds to avoid built-up edge. The following parameters are for H13 carbide with DLC coating.
| Operation | Cutting Speed (m/min) | Feed (mm/rev) | Depth of Cut (mm) | Coolant |
|---|---|---|---|---|
| Turning (rough) | 250 – 400 | 0.10 – 0.25 | 1.0 – 2.5 | Water-miscible (5-8%) |
| Turning (finish) | 350 – 500 | 0.05 – 0.12 | 0.2 – 0.5 | Mist or air blast |
| Milling (rough) | 200 – 350 | 0.08 – 0.20 (mm/tooth) | 1.0 – 2.0 | Water-miscible |
| Milling (finish) | 300 – 450 | 0.04 – 0.10 (mm/tooth) | 0.2 – 0.5 | Mist or air blast |
| Drilling | 80 – 150 | 0.05 – 0.15 | – | Water-miscible |
Applications
- Beverage Industry: Can bodies, ends, and tabs (sheet form); machined fill nozzles and inspection fixtures.
- Building & Construction: Roofing sheets, siding, gutters, and structural panels requiring corrosion resistance.
- Automotive: Heat shields, fuel tank components, and interior trim parts.
- Chemical Equipment: Storage tanks and piping for mild chemical environments.
- Custom CNC Parts: Machined brackets, enclosures, and prototypes where formability and corrosion resistance are critical.
CNC Machining Tips
Tool Material: Uncoated or DLC-coated carbide (ISO K10/K20). For high-volume production, PCD tools are recommended for extended life.
Coating: DLC (diamond-like carbon) reduces friction and prevents built-up edge. Uncoated polished carbide also works well.
Coolant: Water-miscible coolant at 5-8% for roughing; mist or compressed air for finishing to avoid thermal distortion. 3004 is prone to galling, so adequate lubrication is essential.
Heat Treatment: 3004 is not heat treatable. Use H32 (strain hardened and stabilized) or H34 tempers for improved machinability. O temper (annealed) is very soft and gummy.
Chip Control: Use sharp, positive rake tools and high feed rates. For drilling, use peck cycles to break chips. Avoid dwell marks that cause work hardening.
Surface Finish: Achievable Ra 0.4 – 0.8 µm. For anodized parts, a uniform surface is essential; use finishing passes with low feed rates.
Why Choose Professional CNC Machining
Precision CNC machining of 3004 aluminum requires expertise in handling soft, ductile materials to achieve tight tolerances and excellent surface finishes. Dongguan Stirling Metal Products Co., Ltd. utilizes advanced CNC lathes and milling centers with high-pressure coolant systems to ensure consistent quality. Our one-stop service includes material sourcing (with MTC), machining, surface treatment (anodizing, polishing), and quality inspection. From prototype to production, we deliver reliable components for your 3004 applications.
Published: 2025-03-21
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