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Composition of Common Brass Alloys

What is brass made from?

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BRASS & COPPER SHEET METAL IN COILS
Colin Molyneux/The Image Bank/Getty Images

Brass alloys can be made using a variety of compositions in order to meet the exact demands of a given application.

Although copper and zinc form the basis of any brass, aluminum, lead and arsenic are often used as alloying agents to improve machinability and corrosion resistance.

The chart below summarizes the composition of a number of commonly used brass alloys:

Compositions of Common Brass Alloys

UNS No. AS No. Common Name BSI No. ISO No. JIS No. Copper % Zinc % Lead % Other
C21000 210 95/5 Gilding metal - CuZn5 C2100 94-96 ~5   -
C22000 220 90/10 Gilding metal CZ101 CuZn10 C2200 89-91 ~10   -
C23000 230 85/15 Gilding metal Cz103 CuZn20 C2300 84-86 ~15   -
C24000 240 80/20 Gilding metal Cz103 CuZn20 C2400 78.5-81.5 ~20   -
C26130 259 70/30 Arsenical brass Cz126 CuZn30As C4430 69-71 ~30   Arsenic
0.02-0.06
C26000 260 70/30 Brass Cz106 CuZn30 C2600 68.5-71.5 ~30   -
C26800 268 Yellow brass (65/35) Cz107 CuZn33 C2680 64-68.5 ~33   -
C27000 270 65/35 Wire brass Cz107 CuZn35 - 63-68.5 ~35   -
C27200 272 63/37 Common brass Cz108 CuZn37 C2720 62-65 ~37   -
C35600 356 Engraving brass,
2% lead
- CuZn39Pb2 C3560 59-64.5 ~39 2.0-3.0 -
C37000 370 Engraving brass,
1% lead
- CuZn39Pb1 C3710 59-62 ~39 0.9-1.4 -
C38000 380 Section brass Cz121 CuZn43Pb3 - 55-60 ~43 1.5-3.0 Aluminum 0.1-0.6
C38500 385 Free cutting brass Cz121 CuZn39Pb3 - 56-60 ~39 2.5-4.5 -

Source: Azom.com
URL: http://www.azom.com/article.aspx?ArticleID=4387

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