January 15, 2019

What is the classification for copper Alloys?

In ASTM standard, it’s easy to verify the copper/brass alloy type.

All copper materiel will be started with the letter of ” C”, for example C95800.

The most common way to categorize wrought and cast copper and copper alloys is to divide them into six families: coppers, high-copper alloys, brasses, bronzes, copper nickels, and nickel silvers. They are further subdivided and identified via the Unified Numbering System (UNS) for metals and alloys.
The designation system is an orderly method of defining and identifying the alloys. The copper section is administered by the Copper Development Association, but it is not a specification. It eliminates the limitations and conflicts of alloy designations previously used and at the same time provides a workable method for the identification marking of mill and foundry products.
In the designation system, numbers from C10000 through C79999 denote wrought alloys. Cast alloys are numbered from C80000 through C999999.

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Generic Classification of Copper Alloys  www.castingquality.com
Generic nameUNS Nos.Composition
Wrought alloys
CoppersC10100–C15815>99% Cu
High-copper alloysC16200–C19900>96% Cu
Leaded brassesC31200–C38500Cu-Zn-Pb
Tin brassesC40400–C48600Cu-Zn-Sn-Pb
Phosphor bronzesC50100–C52400Cu-Sn-P
Leaded phosphor bronzesC53200–C54400Cu-Sn-Pb-P
Copper-phosphorus and copper-silver-phosphorus alloysC55180–C55284Cu-P-Ag
Aluminum bronzesC60800–C64210Cu-Al-Ni-Fe-Si-Sn
Silicon bronzesC64700–C66100Cu-Si-Sn
Other copper-zinc alloysC66400–C69710
Copper nickelsC70100–C72950Cu-Ni-Fe
Nickel silversC73500–C79800Cu-Ni-Zn
Cast alloys
CoppersC80100–C81200>99% Cu
High-copper alloysC81400–C82800 .>94% Cu
Red and leaded red brassesC83300–C84800Cu-Zn-Sn-Pb (75–89% Cu)
Yellow and leaded yellow brassesC85200–C85800Cu-Zn-Sn-Pb (57–74% Cu)
Manganese bronzes and leaded manganese bronzesC86100–C86800Cu-Zn-Mn-Fe-Pb
Silicon bronzes, silicon brassesC87300–C87800Cu-Zn-Si
Tin bronzes and leaded tin bronzesC90200–C94500 Cu-Sn-Zn-Pb
Nickel-tin bronzesC94700–C94900Cu-Ni-Sn-Zn-Pb
Aluminum bronzesC95200–C95900Cu-Al-Fe-Ni
Copper nickelsC96200–C96900Cu-Ni-Fe
Nickel silversC97300–C97800Cu-Ni-Zn-Pb-Sn
Leaded coppersC98200–C98840Cu-Pb
Miscellaneous alloys C99300–C99750 —

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