CW101C Beryllium Copper Alloy Bright Bars With Good Thermal Conductivity
Product Normal Description:
Product Name: Beryllium Copper Alloy Bright Bars
Grade: CW101C
Standard: ASTM B196,251,463; SAE J461,463; AMS 4533,4534,4535; AMS 4650,4651; RWMA Class 4
Product Diameter: 5mm-100mm
State: A(TB00),1/2H (TD02), H(TD04),AT(TF00),HT(TH04)
Typical Application: For electrical industry
Product Brand: jinshunlai
CW101C Beryllium Copper Alloy Information:
| Alloy |
Shape |
Specification |
Chemical Composition |
Density |
Density before age hardening |
Elastic Modulus |
Thermal Expansion Coefficient |
Thermal Conductivity |
Melting Range |
| UNS.C17200 |
Rods/Bars |
ASTM B196,251,463; SAE J461,463; AMS 4533,4534,4535; AMS 4650,4651; RWMA Class 4
|
Beryllium(Be): 1.80-2.00%
Cobalt(Co) + Nickel(Ni): 0.20% Min
Cobalt(Co) + Nickel(Ni) + Iron(Fe): 0.60% Max
Lead: 0.02% Max
Copper(Cu): Balance
Note: Copper plus additions equal 99.5% Minimum.
|
8.36
(g/cm3)
|
8.25
(g/cm3)
|
13.4
(kg/mm2 (103))
|
17 x 10-6
(20 °C to 200 °C m/m/°C)
|
0.25
(cal/(cm-s-°C))
|
870-980
(°C)
|
| CuBe2 |
| DIN.2.1247 |
| CW101C |
Mechanical and Electrical Properties of CW101C Beryllium Copper Alloy Bright Bars:
| Temper(*) |
Diameter |
Heat Treatment |
Tensile Strength ksi |
Elogation Percent
(Min)
|
Electrical Conductivity Percent
IACS
|
Hardness Rockwell B or C Scale |
| A(TB00) |
ALL SIZE |
/ |
400~600 |
30 |
15~19 |
B45~85 |
| 1/2H(TB04) |
5~40 |
/ |
550~700 |
10 |
15~19 |
＞B78 |
H(TD04) |
5~10 |
/ |
660~900 |
5 |
15~19 |
＞B88 |
| ＞10~25 |
/ |
620~860 |
5 |
15~19 |
| ＞25 |
/ |
590~830 |
5 |
15~19 |
| AT(TF00) |
ALL SIZE |
3 hr 320°C |
1100~1380 |
2 |
22~28 |
C35~42 |
| HT(TH04) |
5~10 |
2 hr 320°C |
1200~1550 |
1 |
22~28 |
C37~45 |
| ＞10~25 |
1150~1520 |
1 |
22~28 |
C36~44 |
| ＞25 |
1120~1480 |
1 |
22~28 |
C35~44 |
The most important Technology
A: Heat treatment
Heat treatment is the most important process for this alloy system. While all copper alloys are hardenable by cold working, beryllium copper is unique in being hardenable by a simple low temperature thermal treatment. It involves two basic steps. The first is called solution annealing and the second, precipitation or age hardening.
B: Solution Annealing
For the typical alloy CuBe1.9 (1.8- 2%) the alloy is heated between 720°C and 860°C. At this point the contained beryllium is essentially “dissolved” in the copper matrix (alpha phase). By rapidly quenching to room temperature this solid solution structure is retained. The material at this stage is very soft and ductile and can be readily cold worked by drawing, forming rolling, or cold heading. The solution annealing operation is part of the process at the mill and is not typically used by the customer. Temperature, time at temperature, quench rate, grain size, and hardness are all very critical parameters and are tightly controlled by ohmalloy.
C: Age Hardening
Age hardening significantly enhances the material’s strength. This reaction is generally carried out at temperatures between 260°C and 540°C depending on alloy and desired characteristics. This cycle causes the dissolved beryllium to precipitate as a beryllium rich (gamma) phase in the matrix and at the grain boundaries. It is the formation of this precipitate which causes the large increase in material strength. The level of mechanical properties attained is determined by the temperature and time at temperature. It should be recognized that beryllium copper has no room temperature aging characteristics.
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