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Copper Alloys Products


Brass is good in terms of machinability, castability, electrical conductivity, heat conductivity and seawater resistance, and thus is commonly used for machine components for various industries, bushes, components of cars and ships.

Brass is called 'notsoe' in Korean and 'sinju' in Japanese. The two letters of the Chinese word for brass(黃銅), '黃' and '銅', represent yellow and copper. The most common brass consists of copper (65%) and zinc (35%). It is also called the following names listed below according to the proportions of copper and zinc.

Red Brass: Zinc is less than 5~20%, and the name originated from its red color. It’s also called gunmetal.
7-3 Brass: It is a type of brass where copper (70%) and zinc (30%) are mixed.
6-4 Brass: It is a type of brass where copper (60%) and zinc (40%) are mixed. Its color is yellow which is close to gold.
Naval Brass: The color of naval brass becomes lighter as the proportion of zinc contained increases and redder as the proportion decreases. Although hardness increases as the proportion of zinc contained increases in general, its brittleness increases as well in such a case, thus the proportion of zinc used shall be less than 45%.


On top of this, there are free-cutting brass where lead is added to increase machinability (cutting) and another type of naval brass (also called navy brass) where tin is added to increase seawater resistance. The Anseong brassware which is the Korean Important Intangible Cultural Heritage No. 77 is an alloy of copper (78%) and tin (22%).

Brass is easy to process in making castings, boards, bars, wires, pipes, etc. and is widely used for daily products, artistic handicrafts, etc..

In addition, brass is commonly used for musical instruments as well. Blond-colored large-size wind instruments are mostly made of brass, and the word ‘brass band’ also originated from the English word 'brass'. Wind instruments used by brass bands also include musical instruments made of copper, bronze, etc..

Among such various uses of brass, the most common use is to make cartridge cases. Brass is not easily broken or ripped (which means it is good in terms of ductility), and thus serves as an ideal material for cartridge cases. Especially in the case of small-caliber cartridges where big momentary pressure changes are applied and where it is hard to make cartridges small, cartridge cases are mostly made of brass.

When brass is used for industrial use, it is often used for connecting parts of pressure vessels like gas containers because its adhesive strength is so good that the gas doesn't leak. Brass is used for valves as well for the same reason.

Because of its processability and harmlessness to the human body, and because it has been recently known to be excellent in terms of hygiene, brass is more commonly used for table wares and grill pans.

Type Code Chemical Composition (Mass%) Tensile strength
    Cu Sn Pb Zn Fe Ni P Al Mn STD No. Designation STD No. Designation
YBsC1(Type1) CAC201 83.0~88.0 0~0.1 0~0.5 11.0~17.0 0~0.2 0~0.2 0 0~0.2 0 145 H5101 YBsC1    
YBsC2(Type2) CAC202 65.0~70.0 0~1.0 0.5~3.0 24.0~34.0 0~0.8 0~1.0 0 0~0.5 0 195 H5101 YBsC2 B505 C85400
YBsC3(Type3) CAC203 58.0~64.0 0~1.0 0.5~3.0 30.0~41.0 0~0.8 0~1.0 0 0~0.5 0 245 H5101 YBsC3 B505 C85700
Product Name Property of Alloy Use
YBsC1(Type1) Easy to solder Flange products, electrical components, ornaments, etc.
YBsC2(Type2) Relatively easy to cast compared to other brass castings Blowholes, electrical terminals, general electrical components, contacts, etc.
YBsC3(Type3) Good in terms of mechanical properties Plumbing irons, electrical components, structural irons, general machine components, daily products, general goods, etc.