How many types of brass are there?

1, lead brass

Lead is actually insoluble in brass and distributes at grain boundaries as a free particle. Lead brass has α and (α+β) according to its structure. Alpha lead brass can only be cold deformed or hot extruded due to the large harmful effect of lead and low plasticity at high temperature. (α+β) lead brass has good ductility at high temperature and can be forged.

2, tin brass

The addition of tin in brass can obviously improve the heat resistance of alloy, especially the ability to improve the corrosion resistance of seawater, so tin brass is called "navy brass".

Tin can be dissolved into copper - based solid solution to strengthen the solution. However, with the increase of tin content, there will be brittle R phase (CuZnSn compound) in the alloy, which is not conducive to the plastic deformation of the alloy, so the tin content of tin brass is generally in the range of 0.5% ~ 1.5%.

Commonly used tin brass hSN70-1, HSN62-1, HSN60-1 and so on. The former is a α alloy with high plasticity and can be processed by cold and hot pressure. The latter two kinds of alloy have (α+β) two-phase structure, and often a small amount of R phase, room temperature plasticity is not high, can only be deformed under hot state.

3. Manganese brass

Manganese has a greater solubility in solid brass. The strength and corrosion resistance of the alloy can be significantly improved without decreasing the ductility by adding 1% ~ 4% manganese into brass.

Manganese brass has (α+β) microstructure and hMN58-2 is commonly used. It has good pressure machining performance under cold and hot states.

4, iron brass

In iron brass, iron is precipitated by iron-rich particles as crystal nuclei to refine grains and prevent recrystallization grains from growing up, so as to improve the mechanical and technological properties of the alloy. Iron brass in the iron content is usually less than 1.5%, its structure is (α+β), with high strength and toughness, plasticity is very good at high temperature, cold state can also be deformed. The commonly used brand is HFE59-1-1.

5, nickel brass

Nickel and copper can form continuous solid solution and enlarge α phase region significantly. The corrosion resistance of brass in air and sea water can be improved by adding nickel. Nickel can also increase the recrystallization temperature of brass and promote the formation of finer grains.

Hni65-5 nickel-brass has a single-phase α structure, which has good plasticity at room temperature and can be deformed at hot state. However, the content of lead impurity must be strictly controlled, or the hot working property of the alloy will be seriously deteriorated.

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