General Purpose Silver Brazing Alloys
These alloys are the optimum choice for a large range of industrial metal joining applications. The free-flowing properties of these alloys, coupled with good joint strengths means that they find use when joining dissimilar parent metals (e.g. stainless steel, mild steels, brasses, bronzes and copper) in a wide range of environments, from industrial cooling to food and pharmaceutical manufacture.
The use of a suitable flux for the parent metal / brazing alloy combination is a requirement for these alloys.
The table below details the alloys that are silicon free and generally preferred by UK manufacturers.
Thessco
Grade | ISO
17672:2016 | Nominal Composition (%) | Melting Range (°C) |
| | Silver | Copper | Zinc | Tin | Solidus | Liquidus |
H12 | Ag 272 | 72 | 28 | | | 780 | 780 |
M26T | Ag 156 | 56 | 22 | 17 | 5.0 | 620 | 655 |
M25T | Ag 155 | 55 | 21 | 22 | 2 | 630 | 660 |
M15T | Ag 145 | 45 | 27 | 25.5 | 2.5 | 640 | 680 |
M10T | Ag 140 | 40 | 30 | 28 | 2 | 650 | 710 |
M8T | Ag 138 | 38 | 32 | 28 | 2 | 650 | 720 |
M4T | Ag 134 | 34 | 36 | 27.5 | 2.5 | 630 | 730 |
M0T | Ag 130 | 30 | 36 | 32 | 2 | 665 | 755 |
L18T | Ag 125 | 25 | 40 | 33 | 2 | 680 | 760 |
This table details the equivalent silicon containing alloys that are generally preferred by European manufacturers.
Thessco Grade | ISO 17672:2016 | Nominal Composition (%) | Melting Range (°C) |
| | Silver | Copper | Zinc | Tin | Silicon | Solidus | Liquidus |
CS114 | Ag 156Si | 56 | 22 | 17 | 5.0 | 0.15 | 620 | 655 |
CS111 | Ag 155Si | 55 | 21 | 22 | 2 | 0.15 | 630 | 660 |
CS91 | Ag 145Si | 45 | 27 | 25.5 | 2.5 | 0.15 | 640 | 680 |
CS81 | Ag 140Si | 40 | 30 | 28 | 2 | 0.15 | 650 | 710 |
CS77 | Ag 138Si | 38 | 32 | 28 | 2 | 0.15 | 650 | 720 |
CS71 | Ag 134Si | 34 | 36 | 27.5 | 2.5 | 0.15 | 630 | 730 |
CS61 | Ag 130Si | 30 | 36 | 32 | 2 | 0.15 | 665 | 755 |
CS51 | Ag 125Si | 25 | 40 | 33 | 2 | 0.15 | 680 | 760 |