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Brass is one of the most-used materials in the world. The term brass generally applies to alloys of copper where the main alloying ingredient beside copper is zinc. Other alloys of copper where the main alloying ingredient is tin are usually referred to as bronze.

Brass is generally known for several things - decent strength and electrical conductivity, it can be polished easily, and there seems to be a brass for just about every application. With few exceptions, most notably C230 Red Brass and C770 Nickel Silver, materials in this category generally are yellow in color. OnlineMetals.com currently stocks six brass alloys.

C230 Brass	(available in Pipe)
C260 Brass	(available in Foil, Plate, Sheet, Tube)
C360 Brass	(available in Hex, Rectangle, Round, Square)
C464 Brass	(available in Plate, Round, Sheet)
C770 Nickel Silver	(available in Sheet)

230 Brass (Red Brass)
As the name would imply, this material is reddish in color. It is one of the stronger brass items that we carry.

C230 Red Brass
Minimum Properties	Ultimate Tensile Strength, psi	70,300
	Yield Strength, psi	57,300
	Elongation	5%
	Rockwell Hardness	B77
Chemistry	Copper (Cu)	84 - 86%
	Zinc (Zn)	15%
	Iron (Fe)	0.05% min
	Lead (Pb)	0.06% min

260 Brass (Cartridge Brass)
260 Brass is known by about a zillion different names, but the most common are yellow brass and cartridge brass, the second because it is generally used for shell casings. As a rule, it is only available in sheet, and is not very machinable, but is a great combination of formability and workability.

C260 Cartridge Brass
Minimum Properties	Ultimate Tensile Strength, psi	61,600
	Yield Strength, psi	52,200
	Elongation	23%
	Rockwell Hardness	B77
Chemistry	Copper (Cu)	68.5 - 71.5%
	Zinc (Zn)	28.5 - 31.5%
	Iron (Fe)	0.05% max
	Lead (Pb)	0.07% max

330 Brass (no nickname for this brass, and it gets picked on by the other brasses)
We've never figured out why this material doesn't have a nickname, but that is the metals industry for you. It is normally only available in tubing products, and has a good balance of both workability and machinability (the latter due to the presence of lead).

If you've ever seen a brass fire pole, or, um, any other kind of brass poles, chances are you were looking at 330 Brass.

C330 Brass
Minimum Properties	Ultimate Tensile Strength, psi	65,300
	Yield Strength, psi	50,000
	Elongation	32%
	Rockwell Hardness	B70
Chemistry	Copper (Cu)	65 - 68%
	Zinc (Zn)	33.5%
	Iron (Fe)	0.07% max
	Lead (Pb)	0.2 - 0.8%

360 Brass (Free Machining Brass)
Free Machining brass is the most commonly used of the brass rod and bar items. The presence of lead in the alloy creates a highly machinable material that can easily be cut and shaped into whatever you need. It is not so good, however, at forming operations.

C360 Free Machining Brass
Minimum Properties	Ultimate Tensile Strength, psi	58,000
	Yield Strength, psi	45,000
	Elongation	25%
	Rockwell Hardness	B78
Chemistry	Copper (Cu)	60 - 63%
	Zinc (Zn)	35.5%
	Iron (Fe)	0.35% min
	Lead (Pb)	2.5 - 3.7%

464 Naval Brass / Naval Bronze
Used primarily in applications where corrosion resistance is important, the material has a small amount of tin added to help deal with corrosion, especially in seawater.

C464 Naval Brass / Naval Bronze
Minimum Properties	Ultimate Tensile Strength, psi	75,000
	Yield Strength, psi	52,900
	Elongation	20%
	Rockwell Hardness	B82
Chemistry	Copper (Cu)	59 - 62%
	Zinc (Zn)	39.25%
	Iron (Fe)	0.10% max
	Tin (Sn)	0.5 - 1.00%

770 (Nickel Silver)
Nickel Silver is named for its silvery appearance, but surprisingly contains no silver at all.

C770 Nickel Silver
Minimum Properties	Ultimate Tensile Strength, psi	108,000
	Yield Strength, psi	89,900
	Elongation	2.5%
	Rockwell Hardness	B96
Chemistry	Copper (Cu)	53.5 - 56.5%
	Iron (Fe)	0.25% max
	Manganese (Mn)	0.5% max
	Nickel (Ni)	16.5 - 19.5%
	Lead (Pb)	0.1% max
	Zinc (Zn)	27%

At OnlineMetals, we all failed shop class. Multiple times. As a matter of fact, our employment applications specifically ask to see people's grades for their high school shop classes. If they're too high, they go into the rejected pile. We're also not engineers, and cannot make any specific recommendations about the suitability of a given alloy, temper, or shape for your project or application.

 

 

출처: http://www.onlinemetals.com/brassguide.cfm