Fe-Ni alloy is generally a soft, ductile material that is difficult to cut, and customer demand has called for free-cutting. However, since S-addition causes a great loss in hot workability, it used to be a difficult steel to make it free cutting.
Yet by adding TICS as a free-cutting element, free cutting has been realized.
- Using TICS to attain free-cutting has dramatically improved machinability.
- Features such as the coefficient of thermal expansion remain unchanged.
[Form of cutting chips]
Description of materials
- Free-cutting invar (K-EL70CS) 36Ni-Fe-TICS
- Free-cutting super invar (K-EL50CS) 32Ni-5Co-Fe-TICS
- Free-cutting kovar (K-ET52CS) 29Ni-17Co-Fe-TIC
|Coefficient of thermal expansion
|Modulus of rigidity
Coefficient of thermal expansion: Upper α20-60℃, Lower α20-100℃