A.2.3. Brass (a-b)
Leaded
|
||||||
|
PRODUCT |
||||||
|
Type |
Metal Alloy |
|||||
|
Chemical Composition |
40% Zn, 2% Pb, Rem. Cu |
|||||
|
Manufacturer |
H. Rollet & Co. Ltd. 105 –
107 Fore Street, Hertford Hertfordshire
SG14 1AS, UK |
Tel: +44 (0)1992 500818 Fax: +44 (0)1992 509905 Email: www.hrollet.co.uk |
||||
|
EXPERIENCE & AVAILABILITY |
||||||
|
Development Status |
Commercial Product |
|||||
|
Cost Range |
Very Low |
|||||
|
Lot Reproducibility |
ASTM B1224/2, BS 2870 CZ120, CuZn40Pb2 |
|||||
|
Space Experience |
Good |
|||||
|
GENERAL PROPERTIES (Physical,
Mechanical, Thermal, Electrical, Optical) |
||||||
|
Nature |
Typical Value |
Remarks |
||||
|
Specific Gravity |
8.4 |
@ Room Temperature |
||||
|
Ultimate Tensile Strength |
350 to 460 MPa |
@ Room Temperature |
||||
|
Proof Stress (0.2%) |
100 to 390 MPa |
@ Room Temperature |
||||
|
Elongation at Break |
20 to 45% |
@ Room Temperature |
||||
|
Thermal Conductivity |
117 W m -1 °C -1 |
@ Room Temperature |
||||
|
Thermal Expansion Coefficient |
20.9 x 10-6 °C -1 |
@ Room Temperature |
||||
|
PROPERTIES RELEVANT TO SPACE USE |
||||||
|
Nature |
Typical Value |
Type of Test |
||||
|
Atmospheric Corrosion |
Thew resistance to atmospheric corrosion is fair. The
material is generally plated for protection. |
|
||||
|
Stress Corrosion |
The resistance to stress corrosion is low (see notes). |
|
||||
|
SPECIAL RECOMMENDATIONS |
||||||
|
·
When this material is used for PCB terminals
(machined), there must be a Copper or Nickel diffusion barrier (3mm)
between the solder coating and the brass,(See: ECSS-Q-70-08). For swaged
terminals, the lead-free variety should be used. ·
Resistance to stress corrosion is low when the
material is 50% cold rolled. Furthermore, it should not be used in stressed
conditions. See ECSS-Q-70-36 for alternative copper alloys with high
resistance to stress corrosion. |
||||||