[14] Steubenville South was purchased and refurbished by a group of investors called Acero Junction,[15] who sold the mill to JSW Steel Ltd for $80.81 million in June 2018.

[17] In July 2020, JSW Steel Ohio was idled indefinitely pending upgrade or replacement of the electric arc furnace, affecting 160 employees.

[18] On March 8, 2021, JSW Steel announced that the upgrade of the electric arc furnace had been completed, the mill would restart the following week.

The mill is now capable of producing 12 inch mini-slabs for JSW Steel's pipe and plate facility in Baytown, Texas.

[21] On February 11, 2022, Cleveland-Cliffs, the owner and operator of the facility since its acquisition of AK Steel in 2020, announced that it would permanently close Mountain State Carbon in the second quarter of 2022, citing the increased usage of hot briquetted iron and scrap in the company's steelmaking decreasing its need for coke.

All 288 employees at the facility will be offered positions within Cleveland Cliffs, with a staff of 15 being maintained to comply with the regulations of decommissioning the coke works.