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.
More top news
Winds will strengthen to gale force by dawn, these severe across exposed coasts and hills particularly in the southwest.
A Swansea charity worker says he was left "shocked and saddened" after being questioned by counter-terrorism officers returning from Iraq.
Our Valleys Correspondent Hannah Thomas has been exploring the beauty of Blaenau Gwent.