6912 FHTB1

DESCRIPTION

Manganese bronze contains small additions of manganese, iron, and aluminium, plus lead for lubricity, anti-seizing, and bonding. Like the aluminium bronzes, they combine high strength with excellent corrosion resistance. Manganese bronze bearings can operate at high speeds under heavy loads, but require high shaft hardness and nonabrasive operating conditions

CHEMICAL COMPOSITION

Elements Min (%) Max (%)
Cu56.0060.00
Pb0.501.50
Sn0.601.10
Fe0.301.25
Mn0.502.00
Al-0.20
Total Others - 0.50
Zn Remainder

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

TYPICAL USES

  • Automotive
  • Fasteners
  • Industrial
  • Marine