Germany · DIN

CW721R

DIN EN 12420 — Copper and copper alloys - Forgings; German version EN 12420:1999

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DIN EN 12164Copper and copper alloys. Rod for free machining purposes
DIN EN 12168Copper and copper alloys - Hollow rod for free machining purposes; German version EN 12168:2011
DIN EN 12167Copper and copper alloys - Profiles and rectangular bars for general purposes; German version EN 12167:1998
DIN EN 12165Copper and copper alloys - Wrought and unwrought forging stock; German version EN 12165:2011
DIN EN 12420Copper and copper alloys - Forgings; German version EN 12420:1999

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wt% · log scale

value range by condition

Element	min	max	Remarks
Al	0.3	1.3
Cu	57	59
Fe	0.2	1.2
Mn	0.8	1.8
Ni		0.3
Pb	0.8	1.6
Sn	0.2	1
Total Others		0.3
Zn			Bal

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
Drop and hand forgings, H100	≥180	≥440	≥15			HV ≥105；HB ≥100

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
					8.30