Quenching and Tempering
The great benefits of martempering are the lowest grade of size alteration and distortion. The austenitized compo- nents are quenched to a temperature close above the mar tensite starting point to ensure tempera-ture equalization between surface and core. This allows a martensitic formation being as uniform as possible during further cooling.
Furthermore, AS salts are the first choice for austem-pering in order to achieve the best attainable tough-ness
Salts for quenching and tempering
|
Product |
Application |
Working |
|
AS 140 |
For austempering, martempering, tempering and bluing; not suitable for components treated in cyanide-containing melt (KCN > 13 %) |
170 – 550 |
|
AS 220 |
For austempering, martempering, tempering and bluing; not suitable for components treated in cyanide-containing melt (KCN > 13 %) |
250 – 550 |
|
AS 235 |
Nitrite-free salt for austempering, martempering, tempering and bluing; not suitable for components treated in cyanide-containing melt (KCN > 13 %) |
280 – 550 |
|
AS 300 |
Nitrite-free salt for austempering, martempering, tempering and bluing; not suitable for components treated in cyanide-containing melt (KCN > 13 %) |
340 – 550 |
|
GS 230 |
For quenching and tempering above 300 °C |
270 – 600 |
|
GS430 |
For quenching and tempering of steel for which AS baths are not suitable |
500 - 600 |