Standard Specification for General Requirements for Wrought Precious Metal Electrical Contact Materials

Importancia y uso:

11.1 For purpose of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with Practice E29.

Property

Unit

Rounded Unit
for Observed or
Calculated Value

Chemical composition

percent

 

Hardness
Knoop (100-g load unless other-
  wise specified)
Vicker (specify load)
Rockwell (all scales, specify which)
Rockwell superficial (all scales,
  specify which)

 

nearest unit on the last right
 hand place of figure of
 specified limit

 Resistivity

 μΩ·cm

 

 Tensile strength

 psi (MPa)

nearest 1000 psi (nearest 10
 MPa)

 Yield Strength

 psi (MPa)

nearest 1000 psi (nearest
 10 MPa)

Elongation

 

 

 Below 5 %

 percent

nearest multiple of 0.5 %

 5 % and over

 percent

nearest 1 %

Grain size

 

 

 Up to 0.055 mm  incl.

 mm

nearest multiple of  0.005
 mm

 Over 0.055 to 0.160, mm, incl.

 mm

nearest 0.01 mm

Subcomité:

B02.05

Referida por:

B0522-01R21, B0685-20, B0683-20, B0628-98R21, B0780-16R21, B0617-98R21, B0693-17R22, B0477-21, B0684_B0684M-22, B0844-98R21, B0541-24, B0596-21, B0563-01R22, B0540-21

Volúmen:

02.04

Número ICS:

77.120.99 (Other non-ferrous metals and their alloys)

Palabras clave:

contacts; electrical contact materials; wrought precious metal;