| SCA5  
Title 14 Kt | Master alloy for casting of 375-585‰(9-14 Kt) yellow gold |  
| --- | --- |

## GENERAL INFORMATION

| Typology | Master alloy for gold |  
| --- | --- |  
| Production process | Casting |  
| Color | Yellow |  
| Color shade | Light yellow |  
| Density[g/cm3] | 12.8 |  
| Melting temperatures |  |  
| Solidus[℃] | 800 |  
| Liquidus[℃] | 855 |

| Commercial composition |  |  
| --- | --- |  
| Ag(%) | 18 |  
| Cu(%) | 64 |  
| Zn(%) | 18 |  
|  |  |  
|  |  |  
|  |  |

## FULL CHARACTERIZATION DATA

| General characteristics |  |  
| --- | --- |  
| As cast grain size[μm] | 720 |  
| Fluidity(grid filling test)[%] | 91 |  
| Color coordinates |  |  
| L* | 87.1 |  
| a* | 1.9 |  
| b* | 18.2 |  
| c* | 8.3 |

| Mechanical characteristics |  |  
| --- | --- |  
| Tensile strength (Rm) [MPa] | 467 |  
| Yield strength (Rp0.2) [MPa] | 268 |  
| Elongation at rupture(A)[%] | 38 |  
| As cast hardness[HV0.2] | 125 |  
| Hardness after 70% area red.[HV0.2] | 275 |  
| Hardness after annealing[HV0.2] | 135 |  
| Single step age-hardening hardness[HV0.2] | 170 |

## PRODUCT APPLICATIONS

| Casting in open systems |  
| --- |  
| Casting in closed systems |  
| Casting without stones |  
| Stone-in-place casting |  
| Age-hardening |

## RELATED PRODUCTS

| C141US | Lower silver content, casting in closed systems |  
| --- | --- |  
| C14GR | Higher level of grain refiners |  
| LSG409 | Medium/soft solder for 585% yellow gold |  
| LSG409D | Medium solder for 585% yellow gold |  
| LSG417F | Medium solder for 375% yellow gold |  
| LSG419 | Extra soft solder for 375% yellow gold |

---

| TECHNICAL DATASHEET AND GUIDELINE |  |  
| --- | --- |  
| SCA5  
Title 14 Kt | Master alloy for casting of 375-585% (9-14 Kt) yellow gold |

## CASTING PROCESSING PARAMETERS

| Casting temperatures | Metal- from [℃] | Metal- to [℃] | Flask- from [℃] | Flask- to [℃] |  
| --- | --- | --- | --- | --- |  
| Thin(below0.5mm) | 955 | 985 | 660 | 720 |  
| Medium(from0.5to1.2mm) | 935 | 955 | 580 | 650 |  
| Thick(above1.2mm) | 915 | 935 | 460 | 600 |  
| Stone-in-place casting treesRemove the flask from the chamber immediately(<1min)after pouring.Let it cool for 25 minutes in air,then quench in water.Trees without stonesLet the flask cool down for10-15 minutes,then quench in water.PicklingDip inRADIAL solution(50g/lconc.at60℃for2min.),or in sulphuric acid(10%conc.at50℃for5min.) |  |  |  |

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**AGE HARDENING PROCESSING PARAMETERS**

| Single step age-hardening treatment | Temperature[℃] | Time[min] | Quenching |  
| --- | --- | --- | --- |  
| Age-hardening | 250 | 90 | Air or in furnace |