ADC12 is the most widely used aluminum die casting alloy in Asia. If you source die cast parts from China, Japan, or Southeast Asia, the default alloy on the quote is usually ADC12 — the same way A380 is the default in North America. The two alloys are closely related but not identical, and knowing the differences matters when you are approving materials for a new program.
We use ADC12 daily across our aluminum die casting production lines at Meituo. Every incoming ingot batch is verified by spectrometer before it enters the melting furnace. This article covers the composition, properties, and practical considerations for ADC12 based on our production experience.
What Is ADC12
ADC12 is an aluminum-silicon-copper casting alloy defined by the Japanese Industrial Standard JIS H 5302. The "ADC" stands for Aluminum Die Casting. It belongs to the same Al-Si-Cu alloy family as A380 but with a different balance of silicon and copper content.
ADC12 goes by several names depending on the standard system:
| Standard | Designation |
|---|---|
| JIS (Japan) | ADC12 |
| ASTM (US) | A383.0 |
| EN (Europe) | EN AC-46100 (AlSi11Cu2) |
| GB (China) | YL113 (YZAlSi11Cu3) |
| BS (UK) | LM2 |
Chemical Composition
| Element | Content Range (wt%) |
|---|---|
| Silicon (Si) | 9.6 – 12.0% |
| Copper (Cu) | 1.5 – 3.5% |
| Iron (Fe) | ≤1.3% |
| Zinc (Zn) | ≤1.0% |
| Magnesium (Mg) | ≤0.3% |
| Manganese (Mn) | ≤0.5% |
| Nickel (Ni) | ≤0.5% |
| Tin (Sn) | ≤0.3% |
| Aluminum (Al) | Balance |
The higher silicon content compared to A380 (9.6–12% vs 7.5–9.5%) gives ADC12 better fluidity during casting. This makes it easier to fill thin-wall sections and complex internal features. The lower copper content (1.5–3.5% vs 3.0–4.0%) means slightly lower peak strength but marginally better corrosion resistance.
Mechanical Properties
| Property | As-Cast (F Temper) |
|---|---|
| Ultimate Tensile Strength | 310 MPa |
| Yield Strength (0.2%) | 150 MPa |
| Elongation at Break | 3.5% |
| Hardness | 75 HB |
| Fatigue Strength | 131 MPa |
The numbers are close to A380 but slightly lower on strength and hardness. In practice, for most die cast parts this difference is not significant enough to affect part performance. ADC12's advantage shows up in casting quality — the higher silicon gives you fewer fill-related defects on complex parts.
ADC12 vs A380: Key Differences
| Property | ADC12 | A380 |
|---|---|---|
| Silicon Content | 9.6 – 12.0% | 7.5 – 9.5% |
| Copper Content | 1.5 – 3.5% | 3.0 – 4.0% |
| Tensile Strength | 310 MPa | 325 MPa |
| Fluidity | Better (higher Si) | Good |
| Corrosion Resistance | Slightly better (lower Cu) | Lower |
| Primary Market | Asia (Japan, China, SE Asia) | North America, Europe |
| Best For | Complex thin-wall parts, general purpose | Higher-strength general purpose |
The practical reality: if your drawing says A380 and your Chinese supplier quotes ADC12, the parts will perform virtually the same for most applications. But the two are not identical specs. If your quality system requires exact grade compliance, make sure the material certificate matches the drawing callout.
Castability and Processing
ADC12 is processed by cold-chamber HPDC, the same as A380. Its higher silicon content gives it a slight edge in mold-filling behavior:
- Fills thin walls (down to ~1.0 mm) with less risk of cold shuts
- Lower shrinkage during solidification — better dimensional stability
- Good pressure tightness for parts that need to seal
- Low die soldering tendency with proper iron and manganese levels
Like A380, ADC12 is not suitable for T6 heat treatment when produced by HPDC due to entrapped gas porosity. Stress-relief (T5) is the practical maximum.
Surface Treatment
ADC12 accepts the same surface treatments as A380:
- Powder coating and painting — standard and reliable with proper pre-treatment
- Electroplating — works well on porosity-free surfaces
- Chromate conversion — good for corrosion protection on internal parts
- Anodizing — same limitation as A380, the high silicon produces a dark, non-uniform finish. Not suitable for decorative anodizing.
Applications
ADC12 shows up across the same industries as A380:
- Automotive: transmission cases, engine brackets, valve bodies, steering components
- Consumer electronics: laptop chassis, smartphone frames, camera housings
- Home appliances: motor end shields, compressor housings, internal brackets
- Industrial: pump bodies, gear housings, pneumatic fittings
In our production, ADC12 is the go-to alloy for home appliance die castings — motor end shields, bearing housings, and structural brackets for washing machines, refrigerators, and air conditioning systems. These parts need good dimensional stability, reliable surface finish for downstream assembly, and consistent mechanical properties across high-volume runs.
Other ADC Series Alloys
ADC12 is the most common, but the JIS standard defines several other grades:
| Grade | Key Difference from ADC12 | Typical Use |
|---|---|---|
| ADC10 | Lower Si (7.5–9.5%), higher Cu — closer to A380 | General purpose, higher strength needed |
| ADC3 | Al-Si alloy with no Cu, better corrosion resistance | Marine and outdoor applications |
| ADC6 | Al-Mg alloy, excellent corrosion resistance | Decorative and marine parts |
Get the Right Alloy for Your Project
If your current program uses ADC12 and you are evaluating a supplier switch, or if you are starting a new project and need alloy selection guidance, send us your part drawing and requirements. We will confirm material compatibility and provide a complete quote covering tooling, unit price, and surface treatment.
