Tata Steel said it is still going ahead with plans to shut down its Port Talbot blast furnaces despite feeling "apprehensive" that the closures "may be put in peril" by the incoming Labour government.
Restructuring plans are expected to continue over the next months and forecast to cause thousands of job losses as the company looks to move into greener forms of production.
Labour had urged Tata Steel to avoid continuing with the closure until after the election result.
Nevertheless, the Indian steel maker said: "The company confirms that it will continue with the announced closure of the heavy end assets and restructuring program at Port Talbot in the coming months.”
As part of Tata's changes it is aiming to use an electric arc furnace, which uses scrap, requires fewer workers and will see a £1.3 billion investment into clean tech.
It urged both political groups “to adhere to and safeguard the agreed terms” of its restructuring plans.
Alasdair McDiarmid, assistant general secretary at Community union, said: “It would be wrong for Tata to make irreversible decisions before such a consequential election.”