Material Selection

Design optimization is depending upon selecting the correct material to achieve the required criteria as per the table of "design requirements versus material properties" which identifies the critical design requirements and material properties that influence them.

Careful examination of the properties required for a particular design and the ranking of these properties in order of importance will assist the designer in selecting of material that has the required combination of properties.



Design Requirements Versus Material Porperties

Design Requirements
Material Property
Normal Force Modulus of Elasticity, Material Dimensions & Tolerances
Insertion Cycles or Durability Resistance to Permanent Set, Fatigue (Low Cycle, R = O), Contact Finish
Load / Deflection Limits
Design Stress
Yield Strength, Modulus of Elasticity
Current Carrying Capacity Conductivity (Electrical & Thermal), Stress Relaxation
Reliability Stress Relaxation, Contact Finish
Cost Density
Fabrication / Size Formability, Machinability, Solderability


Copper Alloy Composition And Density


UNS
Designation
Brush
Alloy
Alloy Name
Chemical Composition
(wt%), Cu Balance
Density
(Ib./in3)
(g/cm3)
C17200*
25
Beryllium Copper
1.8 Be, 0.2 Co
0.302**
8.36**
 
190
Beryllium Copper
1.8 Be, 0.2 Co
0.302**
8.36**
 
290
Beryllium Copper
1.8 Be, 0.2 Co
0.302**
8.36**
C17300*
M25
Beryllium Copper
1.8 Be, 0.2 Co, 0.2-0.6 Pb
0.302**
8.36**
C17000*
165
Beryllium Copper
1.7 Be
0.304**
8.41**
C17510*
3
Beryllium Copper
1.7 Ni, 0.3 Be
0.319***
8.83***
C17500*

10

Beryllium Copper
2.6 Co, 0.5 Be
0.319***
8.83***
C17410*
174
Beryllium Copper
0.3 Be, 0.5 Co
0.318
8.80
C19150

1915

Leaded Ni Copper
1.0 Ni, 0.8 Pb, 0.25 P
0.320
8.88
C19400
 
Copper Iron
2.4 Fe, 0.1 Zn
0.317
8.78
C26000
 
Cartridge Brass
30 Zn
0.308
8.53
C51000
 
Phosphor Bronze A
5.0 Sn, 0.1 P
0.320
8.86
C52100
 
Phosphor Bronze C
8.0 Sn, 0.1 P
0.318
8.80
C65400
 
Silicon Bronze
3.0 Si, 1.5 Sn, 0.1 Cr
0.309
8.55
C68800
 
Aluminum Brass
22.7 Zn, 3.4 A1, 0.4 Co
0.296
8.19
C72500
 
Cu-Ni-Sn
9.5 Ni, 2.3 Sn
0.321
8.89
C7025*
 
Cu-Ni-Si
3.0 Ni, 0.65 Si, 0.15 Mg
0.318
8.80
C72700*
 
Spinodal
9.0 Ni, 6.0 Sn, 0.1 Mn
0.321
8.89
C72900*
 
Spinodal
15.0 Ni, 8.0 Sn
0.323
8.95
N03360*
360
Beryllium Nickel
2.0 Be, 0.5 Ti, Ni balance
0.294
8.14

* = age hardenable materials
** = density before age hardening = 0.298 lb/in3 (8.25 g/cm3)
*** = density before age hardening = 0.316 lb/in3 (8.75 g/cm3)