60% Manganese Aluminum is a highly concentrated master alloy with a nominal composition of 40% Al and 60% Mn, designed as a critical hardener and grain structure modifier for aluminum casting and wrought alloys. Solidus is approximately 1,220°F (660°C) and liquidus approximately 2,050°F (1,120°C), with a density of 0.158 lbs/in³ (4.37 g/cm³) — the highest density in this master alloy category, reflecting manganese’s high atomic weight. Dissolution is temperature-driven at 1,350°F and above.
Manganese serves two primary functions in aluminum alloys. First, it neutralizes the harmful effects of iron impurities by converting brittle, needle-like beta-Al5FeSi phases into less damaging compact alpha-phase intermetallics, significantly improving ductility and impact strength in recycled aluminum melts. Second, it is the primary strengthening element in 3000-series alloys such as 3003 and 3105, used in beverage can stock, architectural siding, and heat exchanger fin stock, where it increases strength without significantly reducing workability or corrosion resistance.
Supplied in broken 5″ x 1/2″ slab form, providing a high-density addition that dissolves reliably in the melt at sufficient temperature.
Available Forms
5" x 1/2" Broken Slab
Product Code
1402
Technical Info
Thermal Properties
Melting Point (Solidus)1,220°F (660°C)
Melting Point (Liquidus)2,050°F (1,121°C)
Physical Properties
Density (imperial)0.158 lbs/in³
Density (metric)4.37 g/cm³
Primary ElementsAl · Mn
Lead FreeYes
Key Features
Iron Phase ModificationDuctility ImprovementGrain Strengthening3000-Series Grade
Solubility Note
Dissolution-driven in aluminum at 1,350°F and above; does not melt instantly — requires adequate temperature and hold time.
Nominal Composition
60% Mn
40% Al
Frequently Asked Questions
Common technical inquiries regarding 60% Manganese Aluminum
Iron in aluminum-silicon alloys normally forms Al5FeSi beta-phase needles — hard, brittle intermetallics that act as crack initiation sites and severely reduce elongation. Manganese additions at a Mn:Fe ratio of approximately 0.5:1 promote the formation of alpha-phase Al15(Fe,Mn)3Si2, which has a more compact, less damaging morphology. This transformation is critical in secondary (recycled) aluminum where iron contamination is unavoidable, allowing acceptable ductility to be maintained without the cost of diluting the iron content with virgin metal.
3003 aluminum contains approximately 1.0–1.5% Mn as its primary alloying element. Manganese forms fine Al6Mn dispersoid particles during solidification and thermomechanical processing that strengthen the alloy through dispersion hardening without significantly impairing formability or corrosion resistance. This makes 3003 approximately 20% stronger than commercially pure 1100 aluminum while retaining the excellent workability needed for deep drawing, spinning, and roll forming into beverage cans, cookware, and architectural products.
The 60% Mn alloy has a liquidus of approximately 2,050°F — far above any practical aluminum melt temperature. This means the intermetallic phases in the master alloy dissolve by solid-state diffusion into the aluminum melt rather than by melting, which is inherently slower. The foundry should add the alloy to a well-stirred melt at maximum practical temperature (1,400°F+), allow sufficient hold time after addition before sampling, and stir periodically to expose fresh alloy surface to the melt. Attempting to rush the addition or sample too early will give falsely low manganese readings.
Al-Be master alloy (97.5% Al, 2.5% Be) for oxidation control and dross reduction in aluminum and magnesium casting melts. 4-5 oz pieces and 5 lb slabs.
Concentrated Al-Be master alloy (95% Al, 5% Be) for oxidation control in large-scale aluminum and magnesium casting. Higher potency than 2.5% grade. 4-5 oz pieces and 5 lb slabs.
Al-Si master alloy (50% Al, 50% Si) for precise silicon additions to improve fluidity and reduce shrinkage in aluminum casting alloys. Waffle and granular forms.
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