Tata Steel UK is set to cut more than 1,000 jobs.
The firm announced proposals to make 750 redundancies at the Port Talbot-based Strip Products UK business along with 100 at mills in Trostre, Corby and Hartlepool and 200 support roles.
Tata Steel UK said the changes followed falling prices in the wake of strong competition from China. Staff are being consulted.
Unions said the news was the latest chapter in the ongoing UK steel crisis.
Karl Koehler, chief executive of Tata Steel’s European operations, said: “These tough actions are critical in the face of extremely difficult market conditions which are expected to continue for the foreseeable future.
“While we welcome progress on UK energy costs, the government must take urgent action to increase the competitiveness of the UK for its vital steel sector.”
Community union general secretary Roy Rickhuss said: “Today’s announcement is no reflection of the skills and commitment of the Tata Steel workforce, which has been breaking production records over the past year. Rather, it is yet another chapter of the UK’s ongoing steel crisis and the lack of a proper government response.
“This industry needs meaningful action from the UK government which up to now has been characterised by fast talking but slow delivery, despite persistent warnings from Community that delays in implementing support for steel would have an impact on jobs.”