Bronze is classified BrAZh9-4 tinless bronzes pressure treated. In another way, it is referred to as CuA19Fe3.
Manufactured in accordance with GOST 18175, bronze BrAZh9-4 alloyed aluminum (not to exceed 10%) and iron (not more than 4%), also contains impurities (Mn impurity should not exceed 0.5% of lead - 0.01%).
Aluminium allows bronze buy additional corrosion resistance, good anti-friction properties. Bronze Iron improves the strength, but the ductility is slightly reduced. The material also shows heat resistance, has a high density of castings, a good conductor of current. In addition to these properties, different acceptable price.
The disadvantages to a considerable shrinkage, lack of resistance to superheated steam, the getter liquid melt, the formation of columnar crystals, resulting in alloy brittleness.
Bronze BrAZh9-4 melts at 1040 degrees and has a linear shrinkage of 2.49%. The coefficient of friction with lubrication BrAZh9-4 equal to 0.004, without lubrication - 0.18. The density of 7500 kg / m3.
Recommended cast bronze continuous method, then processed by quenching in water or oil - which can further increase strength. To improve the strength of the same bronze is aged.
Comes BrAZh9-4 bronze in form of ingots / billets. It is used for the needs of the aerospace, mechanical engineering, to create various parts of engines, chemical industry, defense and oil. Well this shows itself in different nodes bronze manufacturing equipment friction. It is perfectly suited for the manufacture of sliding bearings, can withstand heavy loads and work at high speeds.