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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".
Announcing 900 job losses and 12 site closures as part of its "transformation strategy" for growth, steel giant Tata said the ongoing European debt crisis had seriously impacted demand.
It said demand for steel within the Euro bloc had fallen by 25% since 2007, and was forecast to slump by another 10% this year.
The company, which employs 19,000 in its steel business in the UK, said it remained committed to investing in the business to help create long-term stability.
A Welsh Government spokesman said today's announcement was "very disappointing news" and "a massive blow" that shows the very real challenges faced by the manufacturing sector.
Tata's European Chief said he today's job losses are part of a "transformation strategy" to make the company capable of succeeding in "difficult economic conditions." Karl Kohler said:
Most of the job losses from steel giant Tata will be in South Wales. More than 500 jobs will be cut from the Port Talbot plant, under a restructuring of management and administrative posts, according the company.
- 580 jobs will be cut across Wales
- 155 jobs will be lost in Yorkshire
- 120 jobs will be cut in the West Midlands
- 30 jobs will be lost on Teesside
Sites to close include Tafarnaubach and Cross Keys in South Wales, while shift levels at the company's Rotherham and Hartlepool plants will be reduced to match production to lower demand for bar products and pipelines.
Steel company Tata is cutting 900 jobs and closing twelve sites under plans to improve competitiveness, the firm announced now.
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Port Talbot is a town built on steel. At its height, 21,000 people worked here.