6912 FMN1

Manganese bronze alloys incorporate minor additions of manganese, iron, and aluminum, and they also include lead to enhance lubrication, prevent seizing, and promote bonding. Similar to aluminum bronzes, manganese bronze alloys effectively blend high tensile strength with outstanding corrosion resistance. Manganese bronze bearings are well-suited for high-speed operations under heavy loads, but it is important to note that they necessitate high shaft hardness and must operate in nonabrasive conditions to maintain their performance.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu56.5060.00
Pb1.001.50
Fe0.30
Mn0.501.20
Total Others0.75
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO 6912 FHTB2 (AS PER TEMPER HB)
Range (mm) From To UTS Min (MPa) PS Min Elongation Min (%) Hardness Min Hardness Max
Round (Dia)1.57539520
Hex (A/F)37039520
Square (A/F)36039520
Rectangle (Thickness)35039520
Physical Properties Metric English
Density8.40 g/cc0.303 lb/in3
CTE, linear26.0 ᶙm/m-˚C14.4 ᶙin/in-˚F
Specific Heat Capacity0.380 J/g-˚C0.0908 BTU/lb-˚F
Thermal Conductivity113 W/m-K784 BTU-in/hr-ft²-˚F
Melting Point880-900 ˚C1620 – 1650 ˚F
Solidus880 ˚C1620 ˚F
Liquidus900 ˚C1650˚F
FABRICATION PROPERTIES
Machinability (CuZn39Pb3 = 100 %)80.00%
Capacity for Being Cold WorkedPoor
Capacity for Being Hot WorkedEquivalent Alloy

6912 FMN1

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