On a whistlestop visit to Tata Steel the Prince commemorated the rebuilding of blast furnace number four - a major £185 million project.
He was then shown a video about the lightweight super-strength steel which could transform safety for British soldiers.
As Charles was taken around the marquee, children from Eastern Primary School performed a series of festive songs.
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A mild night with heavy showers spreading to most parts by the early hours!
Tata UK's chief executive told ITV News they have great faith in the Port Talbot workers helping to make the company a success.
First Minister Carwyn Jones told ITV News the deal between Tata and the unions