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Alloy 674 Manganese Bronze

Sequoia Brass & Copper sells alloy 674 manganese bronze. Available in rod or shapes product forms, 674 manganese bronze has excellent hot forging and pressing capabilities with a forgeability rating of 100. There is a higher lead content in 673 manganese bronze which increases the machinability but decreases the yield values. Typical uses of 674 manganese bronze include industrial cams, gears, wear plates, bushings, chain guides, shafts, and connecting rods.

  • Chemical Composition
  • Fabrication Properties
  • Casting Characteristics
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  Cu Al Fe Pb Mn Ni Si Sn Zn
Min/Max 57.0 - 60.0 0.5 - 2.0 0.35 0.5 2.0 - 3.5 0.25 .50 - 1.5 0.3 Rem.
Nominal 58.5 1.2 2.8 1 36.5
Joining Technique Suitability
Soldering Fair
Brazing Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Fair
Coated Metal Arc Welding Not Recommended
Spot Weld Good
Seam Weld Good
Butt Weld Good
Capacity for Being Cold Worked Poor
Capacity for Being Hot Formed Excellent
Forgeability Rating: 100
Machinability Rating: 30
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Common Fabrication Processes For 674 Manganese Bronze

Hot forging and pressing, machining

Typical Uses

Cams, gears, wear plates, bushings, food conveyer chain, chain guides, shafts, connecting rods