N. M. Bronze (a High Tensile Bronze) as Material for Marine Propellers

Abstract

The author explained N. M. Bronze and compared it to ordinary manganese bronze with high and moderate manganese content in regard to the main qualities required for marine propellers, namely,
1. Resistance to corrosion and erosion by sea water,
2. Tensile strength etc., and homogeneity of material,
3. Casting and machining properties,
4. Cost,
5. Suitability for repair by welding, fairing, etc.,
all based on the results of tests actually carried out on propeller castings and gave a conclusion as to the general superiority of N. M. Bronze over the others.