C67400

Manganese bronze alloys incorporate minor augmentations of manganese, iron, and aluminum, along with the inclusion of lead to enhance lubrication, prevent seizing, and promote adhesion. Similar to aluminum bronze alloys, they offer a unique amalgamation of high tensile strength and superior resistance to corrosion. Manganese bronze bearings are capable of functioning effectively at elevated speeds while bearing heavy loads, yet they necessitate shafts with elevated hardness and operating environments devoid of abrasiveness.

CHEMICAL COMPOSITION
Elements Min (%) Max (%)
Cu 57.00 60.00
Pb 0.50
Sn 0.30
Zn Rem
Fe 0.35
Ni 0.25
Al 0.5 2.00
Mn 2.00 3.50
Si 0.50 1.50
(1) Cu + Sum of Named Elements 99.5% min. (2) Cu value includes Ag. (3) Ni value includes Co.
MECHANICAL PROPERTIES ACCORDING TO SAE J463 C67400 (AS PER TEMPER HO2)
Range (MM) From To UTS Min (Mpa) PS Min (Mpa) ELo Min (%) Hardness Min (HRB) Hardness Max (HRB)
Round (Dia) 8756303708170210
Hex (A/F) 8 70 630 370 8 170 210
Square 8 60 630 370 8 170 210
Rectangle (Thickness) 8 50 630 370 8 170 210
PHYSICAL PROPERTIES
Melting Point – Liquidus°F1625
Melting Point – Solidus°F1590
Density lb/cu in. at 68°F0.292
Specific Gravity8.08
Electrical Conductivity % IACS at 68°F23
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F58
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 11
Specific Heat Capacity Btu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tension ksi16000
Modulus of Rigidity ksi6000
FABRICATION PROPERTIES
Technique Suitability
SolderingFair
BrazingGood
Oxyacetylene WeldingNot Recommended
Gas Shielded Arc WeldingFair
Coated Metal Arc WeldingNot Recommended
Spot WeldGood
Seam WeldGood
Butt WeldGood
Capacity for Being Cold WorkedPoor
Capacity for Being Hot FormedExcellent
Forgeability Rating100
Machinability Rating30

C67400

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