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| Material: | Elkaloy 55, 38 & 30 | |
| Type of Product: | Cadmium free silver brazing alloys intended primarily as substitutes for the cadmium bearing Elkaloy 42. They have been developed from the silver: copper: zinc system which in many cases has been modified by a small addition of tin. Tin is beneficial in that it reduces the brazing temperature and improves the fluidity of the alloy. | |
| Application: | The alloys in this group are suitable for use on all common engineering materials with the exception of aluminium and its alloys. | |
| Elkaloy 55 | Elkaloy 55 is generally considered to be the best alloy in this group, combining as it does the lowest brazing temperature with a short melting range. Although it is relatively expensive, this alloy is widely used as a substitute for Elkaloy 42. | |
| Elkaloy 55 has excellent mechanical properties and is also suitable for sea water applications, being resistant to dezincification (a form of galvanic corrosion, generally associated with two phase brass alloys, in which the zinc rich beta phase is selectively leached out of the brass, leaving a sponge like matrix of the copper rich phase). | ||
| Elkaloy 38 & 30 | These alloys are suitable for the hand brazing of medium and light weight assemblies, where the higher brazing temperatures required can be achieved without difficulty and where hand feeding of the alloy largely precludes the danger of liquation. In particular, they are extensively used for brazing pipework in the refrigeration and air conditioning industries. The long melting ranges of these alloys make them ideal for applications where large fillets are required or close tolerance joint gaps cannot be maintained. | |
| The mechanical properties of the alloys in this group, as indicated by the tensile and shear figures given below are similar to those for the rest of the Elkaloy range. However, they are known to be prone to cracking if subjected to high stresses at elevated temperatures. Consequently, it is recommended that brazed assemblies are not quenched from high temperatures (in excess of 300o C) and that these alloys are not used to braze large, dissimilar metal assemblies, where the joint will be under tension during cooling. | ||
| Physical Properties: | Elkaloy 55 | |
| Composition: | 55% Ag:Cu:Zn:Sn | |
| Melting range 0C: | 630-660 | |
| *Tensile strength kgf/mm2: | 42 | |
| *Shear strength kgf/mm2: | 17 | |
| BS 1845:1984: AG14 | AG14 | |
| DIN 8513:1986: | L-Ag 55:Sn | |
| Elkaloy 55 | ||
| Composition: | 38% Ag:Cu:Zn:Sn | |
| Melting range 0C: | 660-720 | |
| *Tensile strength kgf/mm2: | 44 | |
| *Shear strength kgf/mm2: | 18 | |
| Elkaloy 30 | ||
| Composition: | 30% Ag:Cu:Zn:Sn | |
| Melting range 0C: | 665-755 | |
| *Tensile strength kgf/mm2: | 47 | |
| *Shear strength kgf/mm2: | 14 | |
| BS 1845:1984: | AG21 | |
| * Figures relate to brazed mild steel specimens in accordance with DIN 8525 | ||
| Flux Selection: | The standard recommendation when working on copper, brass or mild steel is to use Elkaflux powder | |
| Forms of Supply: | The main forms of supply are 1.5mm and 2.0mm dia. rod but other forms available are: wire; strip; foil; washers; rings and special shapes |
| All Mallory Alloys Group products conform to, if not exceed, the relevant standards as assured by the Quality Management System |  |
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