30% Manganese Copper

Lead-freeDeoxidizer and Desulfurizer Fast Dissolving Manganese Source Predictable Manganese Recovery Two Piece Sizes

Copper-manganese master alloy (70% Cu, 30% Mn) for adding manganese to bronzes, brasses, and copper-nickels. Low melting point for fast dissolution.

Solidus

1,598°F (870°C)

Liquidus

1,652°F (900°C)

Density

0.302 lbs/in³ (8.35 g/cm³)

Primary Elements

Cu, Mn

Nominal Composition

0.25% Fe, 30% Mn, 70% Cu

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Product Overview

30% Manganese Copper is a copper-manganese master alloy with a nominal composition of 70% Cu and 30% Mn. Pure manganese melts at over 2,270°F and oxidizes readily, which makes it difficult to add directly to a copper melt. Alloyed with copper, it melts at roughly 1,600–1,650°F, below normal copper alloy pouring temperatures, so it dissolves quickly and delivers a predictable manganese recovery.

Manganese is an important alloying element in many copper alloys. It is a key strengthening element in manganese bronzes, is added to aluminum bronzes and nickel aluminum bronzes, and is a standard addition in copper-nickel alloys for marine service, where it improves strength and corrosion resistance. Manganese also acts as a deoxidizer and desulfurizer, improving melt cleanliness and castability.

Supplied in two piece sizes: 3–5 lb pieces for production melts and 2″ x 2″ pieces (approximately 3/4 lb each) for smaller heats and precise additions.

Available Forms

2" x 2" Pieces (Approx. 3/4 Lb.), 3-5 Lb. Pieces

Product Code

4693

Technical Info

Thermal Properties

Melting Point (Solidus)1,598°F (870°C)

Melting Point (Liquidus)1,652°F (900°C)

Physical Properties

Density (imperial)0.302 lbs/in³

Density (metric)8.35 g/cm³

Primary ElementsCu, Mn

Lead FreeYes

Key Features

Deoxidizer and DesulfurizerFast Dissolving Manganese SourcePredictable Manganese RecoveryTwo Piece Sizes

Solubility Note

add to the molten bath and stir. Dissolves faster and with less oxidation loss than electrolytic manganese., Melts below typical copper alloy pouring temperatures

Nominal Composition

70% Cu
30% Mn
0.25% Fe

Pure manganese has a high melting point and oxidizes easily, so direct additions dissolve slowly and lose a variable amount of manganese to dross. 30% Manganese Copper melts below normal pouring temperatures, dissolves rapidly, and is protected from oxidation by the copper. That gives more consistent manganese recovery and easier chemistry control.

Divide the manganese you need by 0.30. For example, to add 1% Mn to a 100 lb melt you need 1 lb of manganese, which is 1 ÷ 0.30 = 3.3 lbs of master alloy. Remember that the 70% copper in the master alloy also becomes part of the melt, so account for it when calculating the final composition of copper-based alloys.

Manganese is a major element in manganese bronzes (high-strength yellow brasses) and is added to aluminum bronzes, nickel aluminum bronzes, and copper-nickel alloys such as 90/10 and 70/30 cupronickel. It is also used in smaller amounts as a deoxidizer and desulfurizer in other copper alloy melts.