BearMet221

Aluminum Bronze

Characteristics：

It is a special high-strength nickel-aluminum bronze alloy with a significant addition of iron. The inclusion of nickel and iron boosts the alloy's strength without reducing its excellent ductility, toughness, and resistance to oxidation and corrosion. The alloy offers outstanding anti-galling and wear-resistant properties.

Typical applications:

Typical applications for BearMet221 include aerospace landing gear components, wing flap bearings, marine fasteners (bolts and nuts), valve spindles, and components. It is also widely used for plunger tips, hydraulic bushings, valve balls, bushings, pump parts, valve guides and seats for automotive engines.

Standardization and composition

UNS	/
EN	CuAl10Ni5Fe4 (CW307G)
JIS	/
GB	T61780 (QAl10-4-4)
Cu	balance %
Al	8.5-11.0%
Fe	3.0-5.0%
Ni	4.0-6.0%
Mn	≤1.0%

Physical properties①

Note①：The testing temperature is 20℃. Note②：The testing temperature range is 20℃ to 300℃.

Density (g/cm³)	7.6
Metling point(℃)	1054
Electrical conductivity (%IACS)	7.0
Thermal conductivity (W / m x K)	39.1
Coefficient of thermal expansion ②(10-6/K)	15.6
Modulus of elasticity (GPa)	121

Fabrication Properties

Note③：C37700 = 100% Note④：C36000 = 100%

Capacity for being cold worked	Poor
Capacity for being hot formed	Good
Brazing	Fair
Resistance welding	Good
Forgeability rating③	75%
Machinability rating④	30%

Mechanical Properties⑤

Note⑤：bedra technical standards

Temper	Diameter (mm)	Tensile Strength (MPa min.)	Yield Strength (MPa min.)	Elongation (A% min.)	Hardness⑤ (HB min.)
R680	8.0≤Φ≤120	680	320	10	170
R740	10≤Φ≤120	740	400	8	200

Dimension Tolerance and Delivery Form

Note⑥：The tolerances listed in the table are specified as all plus or all minus. When tolerances are specified as plus and minus (±), half the values given.

			Straight bar
Diameter (mm)	Tolerance⑥ (mm)	Ovality (mm)	Length (mm. max.)	Straightness (mm/m max.)
8 ≤ Φ ＜ 10	0.12	0.06	3600	1.0
10 ≤ Φ ＜ 18	0.16	0.08	3600	1.0
18 ≤ Ф ＜ 50	0.20	0.10	4000	1.0
50 ≤ Ф ＜ 60	0.30	0.15	4000	1.0
60 ≤ Ф ＜ 70	0.30	0.15	4000	3.0
70 ≤ Ф ＜ 90	1.20	0.60	3000	3.0
90 ≤ Ф ≤ 120	2.0	0.80	2000	5.0