Aluminum clad steel bimetal

Aluminum clad steel bimetal

Aluminum bimetal -----Structure Transition Joints

Chalco aluminum’s structure transition joints aluminum bimetal are commonly used to make a welded and maintance free connection between alloyed aluminum components and steel structures in the shipbuilding, railway and automotive industry.

Aluminum clad steel bimetal

The major shortcomings of rivets and bolts are that they require holes to be drilled, need special insulators and require regular assembly inspection. Any removal of material, such as drilling holes, also weakens the metal.

Aluminum bimetal--Structure transtion joints are an indisputably better option because they eliminate crevices and have shown to limit crevice corrosion. Aluminum bimetal - Transition joints require no extra hardware, which allows engineers to stream-lin, their designs and shave off extra weight..

Types Temper Features
CA100 No transition layer higher cost performance
CA101 Thin transition layer High bonding strength
CA200 Thick transition layer Ultra-high bond strength

CA 100 CA 101 CA 200
Interface bonding rate 100% 100% 100%
Tension strength >85 Mpa >110 Mpa > 210 Mpa
Shearing strength >65 Mpa >85 Mpa > 137 Mpa
Highest temperature 315℃×30 min 400 ℃ × 30 min 500 ℃ × 30 min

Aluminium alloy clad steel for brazing type exchanger

The material mark and specification of cladding strip

Material mark Specification /mm
Mark Non-clad
Layer
Double side
Cladding
Aluminium
Layer
Base mark Cladding
Strip thickness
Cladding
Strip width
Cladding
Layer width
Non-alu.
Edge width
4A60/08A1 4A60 __ 08A1 0.21—2.0 50—500 0.05—0.1 2.0—4.0
Cladding Aluminum
4A33/08A1
___ Cladding aluminum
4A33
1.5—5.5 60--300 0.3—1.5 0
Cladding aluminum
7A16/08A1
Cladding aluminum
7A16
Cladding aluminum
8A60/08A1
Cladding aluminum
8A60
Cladding aluminum
8A61/08A1
Cladding aluminum
8A61
Cladding aluminum
8A62/08A1
Cladding aluminum
8A62

Chemical composition


Alloy
Sign
Chemical Composition
Si Sn Fe Ni Cu Mn Mg Zn Pb Ti Single Sum Al
4A33 10.0-
12.0
<=0.2 <=0.3 <=0.1 0.7-
1.3
<=0.1 __ __ __ <=0.1 <=
0.05
<=
0.15
Remind
4A60 0.8—
1.0
__ 0.2—
0.35
__ <=
0.05
<=
0.03
<=
0.3
<=
0.05
__ <=
0.03
<=
0.05
<=
0.15
7A16 1.0—
2.0
<=0.2 <=0.6 <=0.2 0.8-
1.2
<=0.3 <=
0.6
4.4-
5.5
0.7-
1.3
<=0.2 <=
0.05
<=
0.15
8A60 <=
0.7
5.5—
7.0
<=0.7 <=1.3 0.7—
1.3
<=0.7 __ __ __ <=0.2 <=
0.05
<=
0.15
8A61 __ 10.0-
14.0
1.8-
3.5
<=0.1 0.4-
1.3
<=
0.35
__ __ 1.0-
2.5
<=0.1 <=
0.05
<=
0.15
8A62 <=
0.7
17.5-
22.5
<=0.7 <=0.1 0.7-
1.3
<=
0.7
__ __ __ <=0.2 <=
0.05
<=
0.15

Cladding layer thickness bias 、base body surface roughness
Cladding layer sign Cladding layer thickness
/ mm
Cladding layer thickness
Bias / mm
Base body surface
Roughness R/um
4A60 0.05—0.100 +- 0.004 __
Cladding aluminium
4A33  7A16  8A60
8A61  8A62
0.4 – 0.8 +- 0.07 <= 0.63
>0.8—1.0 +-0.08
>1.00 +-0.09

Cladding Strip no edge width bias
Cladding Strip Width Non-edge width bias
50.00—100.00 +- 0.30
>100.00—300.00 +- 0.50
>300.00—500.00 +- 1.00

Burr 、Stagger floor 、Tower-shaped
Cladding Strip Width Burr Stagger floor Tower floor
0.200—0.500 <=0.06 <=1.0 <=10
>0.500—1.000 <=0.10 <=2.0 <=15
>1.000—2.000 <=0.15 <=2.5 <=20
>2.000-- 5.500 <=0.20 <=3.0 <=25

Side Curvature
Cldding Strip Width / mm Side Bending degree / mm
50.00—100.00 3.0
>100.00—300.00 2.0
>300.00—500.00 1.5

Surface  Hardness
Product Sign Aluminium hardness in Cladding Layer / HB Base body Hardness
/ HBW
A grade B grade
Cladding Alu. 4A33 /08A1 45—60 --- 160----220
Cladding Alu.7A16 / 08A1 45---70 70---100
Cladding Alu.8A60 /08A1 35---45 ---
Cladding Alu.8A61 /08A1 35---45 ---
Cladding Alu.8A62 /08A1 30---40 ---