- High Chromium Alloy (25 wt%)
- Designed for use in automotive heat exchangers and brazed on a belt furnace
- Brazing temperature, 1080°C
New MBF62, MBF64 and MBF67 Alloy Composition
| Alloy | Nominal Composition, wt % | Temp | Density g/cm | |||||||
| Ni | Cr | Fe | Si | B | P | Mo | Solidus | Liquid | ||
| MBF62 | Bal | 21 | <1 | 0.5 | 0.5 | 8.0 | 1.0 | 878 (1612) |
990 (1814) |
7.74 |
| MBF64 | Bal | 17.5 | 4.0 | 3.0 | 0.8 | 5.0 | 1.0 | 913 (1675) |
978 (1792) |
7.68 |
| MBF67 | Bal | 25 | <1 | 1.5 | 0.5 | 6.0 | 1.5 | 890 (1634) |
970 (1778) |
7.70 |
Available Geometry
| Maximum Width by Thickness | |||
| Alloy | Standard | ||
| 0.0010″ (25.4 µm) |
0.0015″ (38.1 µm) |
0.0020″ (50.8 µm) |
|
| MBF62 | 6.7″ (170.18 mm) |
8.5″ (38.1 mm) |
6.7″ (50.8 mm) |
| MBF64 | 6.7″ (170.18 mm) |
8.5″ (38.1 mm) |
– |
| MBF67* | 6.7″ (170.18 mm) |
8.5″ (38.1 mm) |
– |
MBF67 Microstructure – Increased Time and Temperature
Longer braze times and temperature show less blocky Cr phases and more refined intermetallic phases along the centerline
|
1090 C – 15 minutes |
1095 C – 15 minutes |
1090 C – 60 minutes |
|
| SS316 |  |
 |
 |
| SS444 |  |
 |
 |
Brazed 316 SS: Single Lap-Shear Test
Nano-indentation of SS316 Joined with MBF51
Uniform and low hardness across the braze layer
 |
|
 |
 |
Nano-indentation of SS316 Joined with MBF67
Intermetallic phases within the braze layer have high hardness
 |
 |
 |
 |
- Alloys
-
New MBF62, MBF64 and MBF67 Alloy Composition
Alloy Nominal Composition, wt % Temp Density g/cm Ni Cr Fe Si B P Mo Solidus Liquid MBF62 Bal 21 <1 0.5 0.5 8.0 1.0 878
(1612)990
(1814)7.74 MBF64 Bal 17.5 4.0 3.0 0.8 5.0 1.0 913
(1675)978
(1792)7.68 MBF67 Bal 25 <1 1.5 0.5 6.0 1.5 890
(1634)970
(1778)7.70 - Geometry
-
Available Geometry
Maximum Width by Thickness Alloy Standard 0.0010″
(25.4 µm)0.0015″
(38.1 µm)0.0020″
(50.8 µm)
MBF62 6.7″
(170.18 mm)8.5″
(38.1 mm)6.7″
(50.8 mm)MBF64 6.7″
(170.18 mm)8.5″
(38.1 mm)– MBF67* 6.7″
(170.18 mm)8.5″
(38.1 mm)– - Structure
-
MBF67 Microstructure – Increased Time and Temperature
Longer braze times and temperature show less blocky Cr phases and more refined intermetallic phases along the centerline
1090 C – 15 minutes
1095 C – 15 minutes
1090 C – 60 minutes
SS316 SS444 - Lap-Shear
-
Brazed 316 SS: Single Lap-Shear Test
- MBF51
-
Nano-indentation of SS316 Joined with MBF51
Uniform and low hardness across the braze layer
- MBF67
-
Nano-indentation of SS316 Joined with MBF67
Intermetallic phases within the braze layer have high hardness