Unions have called the news that Tata is cutting 900 jobs "devastating" and said it capped off a "dark" week for the UK economy.
The news follows announcements of further potential and real job losses at Vion, Premier Foods, Standard Life, Comet and Newcastle City Council.
Unite general secretary Len McCluskey said: "Today's news at Tata rounds off a dark seven days for the UK economy."
Michael Leahy, general secretary of the Community trade union, said he was seeking an "urgent meeting with the company to ensure our principle of no compulsory redundancies is upheld".
More top news
A sigh of relief across Westminster and a crushing sense of disappointment for 45% of Scotland, but Yes campaign could not have done more.
ITV Border Political Editor Peter MacMahon says we've just seen a emotional former SNP MSP appearing to concede that the Yes side has lost.
ITV Border Political Editor Peter MacMahon says it's far too early to call this referendum.