Brass & Special Brass CuZn21Si3P (CW724R)

The lead free silicon brass CuZn21Si3P, CW724R, also known as a special brass, combines very good machinability with good cold and hot formability as well as high strength values, making it a highly versatile material. CuZn21Si3P offers good corrosion resistance and dezincification resistance as well as resistance to stress corrosion cracking.

Properties

Chemical properties

Cu	75,0 - 77,0 %
Al	max. 0,05 %
Fe	max. 0,3 %
Mn	max. 0,05 %
Ni	max. 0,2 %
P	0,02 - 0,10 %
Pb	max. 0,1 %
Si	2,7 - 3,5 %
Sn	max. 0,3 %
Zn	Rest
Others	max. 0,2 %

Mechnical properties - bars

Condition	Tensile strength R_m N/mm²Tensile strength R_m N/mm²	Yield strength R_{p 0,2} N/mm²	Elongation A %	Hardness HB
Round bars
Ø 2-9 mm R670 - H170	≥ 670	≥ 400	≥ 10	170 - 220
Ø 10-40 mm R600 - H150	≥ 600	≥ 300	≥ 12	150 - 220
Ø 41-80 mm R500 - H130	≥ 500	< 450	≥ 15	130 - 180
Hexagon bars
SW 2-14 mm R670 - H170	≥ 670	≥ 400	≥ 10%	170 - 220
SW 15-39 mm R600 - H150	≥ 600	≥ 300	≥ 12%	150 - 220
SW 40-80 mm R500 - H130	≥ 500	< 450	≥ 15%	130 - 180

Product variants

Round bars

Alloy	CuZn21Si3P, CW724R
Variant	till Ø 60 mm extruded and drawn, stress released from Ø 61 mm extruded both sides chamfered, lenght 3 m
Norm	DIN EN 12164
Tolerance	DIN 1756, h10 Ø 5 - 6 mm +0/-0,05 mm Ø 7 - 11 mm +0/-0,06 mm Ø 12 - 18 mm +0/-0,07 mm Ø 19 - 32 mm +0/-0,08 mm Ø 33 - 50 mm +0/-0,16 mm Ø 51 - 60 mm +0/-0,19 mm Ø 61 - 120 mm +0/-1,2 mm
Datasheet	Datasheet

Flat bars

Alloy	CuZn21Si3P, CW724R
Tolerance	+/- 0,15 ; +/- 0,09 mm

Hexagon bars

Alloy	CuZn21Si3P, CW724R
Variant	extruded and drawn, stress released, both sides chamfered lenght 3 m
Norm	DIN EN 12164
Tolerance	DIN EN 12164 SW 8 - 11 mm +0/-0,09 mm SW 12 - 18 mm +0/-0,11 mm SW 19 - 30 mm +0/-0,13 mm SW 31 - 50 mm +0/-0,16 mm
Datasheet	Datasheet

Similar materials

C 69300

Typical applications

CuZn21Si3P is a highly versatile material, so the industries and applications listed below are examples rather than a complete picture:

Turned parts
Hot forged components
Process equipment and valves
Potable water applications
Pumps
Mechanical engineering

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