6912 FHTB1

Manganese bronze alloys incorporate minor amounts of manganese, iron, and aluminum, along with the inclusion of lead to enhance lubrication, prevent seizing, and promote bonding. Similar to aluminum bronzes, manganese bronze alloys effectively blend high tensile strength with outstanding resistance to corrosion. Manganese bronze bearings are capable of performing efficiently at elevated speeds and while bearing heavy loads. However, it’s essential to note that they necessitate high shaft hardness and must operate under nonabrasive conditions to maintain their performance.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu56.0060.00
Pb0.501.50
Sn0.601.10
Fe0.301.25
Mn0.502.00
Al0.20
Total Others0.50
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO 6912 FHTB1 (AS PER TEMPER HB)
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia)1.57543018015
Hex (A/F)37043018015
Square (A/F)36043018015
Rectangle (Thickness)35043018015
Physical Properties
Melting Point – Liquidus°F1630
Melting Point – Solidus°F1590
Densitylb/cu in. at 68°F0.302
Specific Gravity8.36
Electrical Conductivity% IACS at 68°F24
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F61
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F)11.8
Specific Heat CapacityBtu/ lb /°F at 68°F0.09
Modulus of Elasticity in Tensionksi15000
Modulus of Rigidity ksi5600
FABRICATION PROPERTIES
Technique Suitability
SolderingExcellent
BrazingExcellent
Oxyacetylene WeldingGood
Gas Shielded Arc WeldingFair
Coated Metal Arc WeldingNot Recommended
Spot WeldGood
Seam WeldFair
Butt WeldGood
Capacity for Being Cold WorkedPoor
Capacity for Being Hot FormedExcellent
Forgeability Rating80
Machinability Rating30

6912 FHTB1

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