[Retracted] Tribological Behavior and Surface Characterization of Gray Cast Iron-EN31 Steel under Lubricated Sliding Conditions

Table 2

Process parameter and their levels.

Levels	Parameters
	Load (N)	Sliding speed (m/s)	Sliding distance (m)
1	15	0.5	300
2	30	1.0	600
3	45	1.5	900