Since the leaking of the Corus job cuts yesterday, more information has emerged during today:-
The cuts, which amount to 10% of the company's UK workforce, is a fresh blow to the manufacturing sector, which has already been hammered by the recession.
The group said the UK job losses form part of 3,500 job cuts worldwide.
Corus, which employs around 42,000 workers across the globe, said every effort would be made to achieve the 3,500 cuts through voluntary redundancies.
Unite joint leader Derek Simpson said the union would not accept any compulsory redundancies.
'We understand that Corus do face difficulties but before this recession Corus had been making extremely healthy profits,' Mr Simpson said.
'Our members have supported Corus through good times and bad and now expect Corus to support them.'
Corus, owned by Indian firm Tata, announced a series of cost-cutting measures including the mothballing of a mill in South Wales and restructuring several parts of its business.
Workers were told the grim news in a series of meetings at plants across the UK this morning.
Union leaders were seeking further information about which factories will be affected by the job losses but it is believed that South Wales will be worst hit.
Between 1,000 and 1,200 jobs will be cut from Corus plants in South Wales, including 600 at Llanwern.
Corus also announced that it was in advanced discussions on the sale of its majority stake in its cast products business based at Teesside.This business employs around 2,000 workers who are not involved in today's job loss announcement.
The company said it was planning to restructure its engineering business in Scunthorpe which will lead to the loss of 93 jobs.
John Wilson, senior officer of the GMB union, said the cuts were a body blow for UK manufacturing.
A combination of falling orders, plus a steel price that has almost halved since September have take their toll.
Corus said it was taking a series of measures aimed at improving its competitiveness.
The firms said in the last quarter of 2008, the measures it had already taken are expected to make savings of around £600m to the end of March. These measures included giving extra training to workers temporarily laid off.Corus bosses said they would continue to discuss with unions how it could match production with falling demand.
'Today's initiative is strategic and structural in nature. Elements of the initiative comprise long-term plans that were already under consideration but which have been brought forward as a result of the slowdown,' a company spokesman said.
The company added that today's measures would improve profits by more than £200m. As part of the plans announced today Corus said it will be restructuring its engineering steels business, expected to lead to the loss of around 920 jobs.
This includes extensive restructuring at the Rotherham factory and the closure of a number of smaller sites at Wednesbury in the West Midlands, Wolverhampton, Bolton, Hetton in the North East and Slough.
The business, which has its largest sites in Rotherham and Stocksbridge, South Yorkshire, will continue to supply specialist steel products to the automotive, aerospace, energy and other sectors after the restructuring, said the company.
Most of the job losses will be at Rotherham where more than 700 workers will be affected.
The Anglo-Dutch company, formed ten years ago by the merger of British Steel and Hoogovens, has been rocked by the paralysis gripping two of its main markets - construction and car manufacturing.
Corus is Europe's second-largest steelmaker and the ninth largest in the world. Two years ago, it was bought by India's Tata Steel for £6.7bn. The Indian firm's sister company Tata Motors also owns the struggling carmaker Jaguar Land Rover, which is pleading with the British government for a bailout and is believed to be considering another 1,500 layoffs.
News of the Corus job cuts come as engineering group GKN is believed to be considering a further jobs purge to add to the 1,400 laid off since October.
The jobs scare comes as David 'Danny' Blanchflower, who has been a member of the Bank of England's rate-setting monetary policy committee since June 2006, warned UK unemployment could hit 3m in a year's time.
The economist, whose warnings that Britain was heading for a recession and calls for interest rate cuts were snubbed by fellow MPC colleagues, also said rates would 'obviously' sink to the near zero levels already reached in the US.
Corus has steelmaking operations in some of the country's most economically disadvantaged areas, including Port Talbot in South Wales, Scunthorpe in South Humberside, and Teesside in the north-east of England. It also has a site in Rotherham. The steelmaker is struggling as orders have collapsed by a third. But, sources insisted none of the group's UK plants are at risk of closure.
Union leaders have pressed ministers to adopt a system offered by the Dutch government where the state makes up the pay of workers put on short working weeks.
Rotherham MP Denis MacShane said: 'I have been in touch with Corus this weekend to urge that production capacity is kept in Rotherham and South Yorkshire so that once the world slump in demand for steel is over the UK will remain a steel-making economy.
'The Government has found billions for the banks and must do what it takes to support steelworkers and their families as we go through this global recession. Corus declined to comment.
But one senior insider said: 'If we take this action now I think we'll be much fitter when things turn around.'
Earlier this month, Corus told about 500 workers at its Llanwern plant in South Wales to stay at home on half their basic pay because work has dried up. Corus's management had planned to restructure the business gradually, but this plan has been accelerated because of the crisis in the world steel industry. Steel prices have more than halved in the last year as demand from China has slowed, and carmakers and the construction industry have been hit by the recession.