What is brass

Brass is an alloy of copper and zinc. If brass consists only of copper and zinc, it is called plain brass. Brass material is called special brass if it is a variety of alloys composed of more than two elements, such as copper alloys composed of lead, tin, manganese, nickel, iron and silicon.

Classification of brass

According to the different kinds of alloy elements contained in brass, brass is divided into ordinary brass and special brass.

Ordinary brass

When zinc content is less than 39%, zinc can dissolve in copper to form single phase A, called single phase brass, good plasticity, suitable for hot and cold compression processing. When the zinc content is greater than 39%, there is a single phase and copper and zinc based B solid solution, called dual-phase brass, B makes the plasticity small and tensile strength rise, only suitable for thermal pressure processing. If the mass fraction of zinc continues to increase, the tensile strength will decrease and it is useless.

Brass alloys containing less than 36% zinc are composed of solid solutions and have good cold working performance. For example, brass containing 30% zinc is commonly used to make shell casings, commonly known as shell brass or seventy-three brass. Brass alloys with zinc content between 36 and 42% are composed of and solid solutions, of which the most commonly used is hexagonal brass with zinc content of 40%.

Under normal circumstances, cold deformation processing with single-phase brass, hot deformation processing with dual-phase brass.

Special brass

In order to improve the corrosion resistance of brass, strength, hardness and the machinability and so on, add a small amount of in copper and zinc alloy (commonly 1% ~ 2%, 3% ~ 4% minority, extremely individual was 5% ~ 6%) of tin, aluminum, manganese, iron, silicon, nickel, lead and other elements that constitute the three yuan, four yuan, five yuan alloy, even is the complex of brass, which is also called special brass.

(1) zinc equivalent coefficient complex brass organization, according to the addition of elements in brass "zinc equivalent coefficient" to calculate. Because the addition of a small amount of other alloying elements to the cu-Zn alloy usually only shifts the α/ (α+β) phase region in the Cu-Zn state diagram to the left or right. Therefore, the tissue of special brass is usually equivalent to that of ordinary brass with increased or reduced zinc content. For example, adding 1% silicon to the cu-Zn alloy is equivalent to adding 10% zinc to the cu-Zn alloy. So silicon has a zinc equivalent of 10. The α/ (α+β) phase boundary in The Cu-Zn series moves significantly towards the copper side, that is, the α phase region is strongly reduced. The "zinc equivalent coefficient" of nickel is negative, that is, the α phase region is enlarged.

(2) the performance of special brass α phase and β phase in special brass are multiple complex solid solution, its strengthening effect is large, while α and β phase in ordinary brass is simple Cu-Zn solid solution, its strengthening effect is low. Although zinc equivalents are equivalent, the properties of the multiple solid solution are different from those of the simple binary solid solution. Therefore, a small amount of multiple strengthening is a way to improve the properties of the alloy.

(3) several commonly used special deformed brass structure and pressure processing performance: lead brass, manganese brass, iron brass, nickel brass and so on.

Recommended products

Brass is an alloy of related very closely to human and, because of its excellent electrical conductivity, thermal conductivity, ductility, corrosion resistance, wear resistance and other characteristics, widely used in electric power, electronics, energy and petrochemical industry, machinery and metallurgy, transportation, light industry, emerging industries and areas such as, the consumption of non-ferrous metal materials in China is second only to aluminum. Therefore, in quality control, material classification, alloy identification, safety prevention, recycling and other field applications, copper alloy brand identification, rapid analysis of metal composition is very important.

For this kind of demand, TrueX handheld alloy analyzer can quickly qualitative analysis and brand identification of copper alloy, with fast, high precision, lightweight, easy to carry advantages, to provide users with rapid, efficient, accurate data information.