Free-cutting Invar/Kovar

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.

Features

1. Using TICS to attain free-cutting has dramatically improved machinability.
2. Features such as the coefficient of thermal expansion remain unchanged.

[Form of cutting chips]

Characteristics

[Physical property]

Steel name	Density （g/cm3）	Coefficient of thermal expansion （X10-6/℃）	Young's modulus （X1010N/m2）	Modulus of rigidity （X1010N/m2）	Poisson's ratio
K-EL70CS	8.12	1.4 1.5	14.3	5.55	0.29
K-EL50CS	8.14	0.6 0.8	14	5.47	0.28
K-ET52CS	8.2	5.48 5.27	13	4.82	0.35

scrollable

Coefficient of thermal expansion: Upper α20-60℃, Lower α20-100℃

[Drilling test result]