The man's family have been informed of his death.

Stephen Galsworthy was killed in the blast

Five more Corus workers remain critically ill on the intensive therapy ward of the hospital's burns unit after the blast at the plant's number five furnace.

And a further five are said to be in a satisfactory condition on a general ward.

The two other men who died have been named as Stephen Galsworthy, 25, and Andrew Hutin, 20.

They were killed by an escape of molten metal which set off a series of explosions in the furnace.

The latest fatality comes as pressure is growing on Welsh Assembly First Minister Rhodri Morgan to release details of a meeting he held with Corus bosses in April after concerns were raised about safety at the Port Talbot plant.

Andrew Hutin: Body found by rescuers

Mr Morgan is expected to make a statement to the assembly on Tuesday.

Safety at the plant was highlighted further when the steel company was fined �300,000 for an explosion at its Llanwern site last year which left a contract worker paralysed from the chest down.

Speaking at Cardiff Crown Court on Monday, the judge said that in relation to the Llanwern incident, there had been "very grave breaches" of the Health and Safety at Work Act.

The hearing was told that the management failed to react to warnings of water under equipment where the blast happened in September.

Tory AM Alun Cairns - whose father works at the plant - has claimed that there were widespread concerns among workers about the condition of the lining of furnace number five.

"There are claims the fifth blast furnace has a poor operating record, with reports of several breakouts in the last five years," said Mr Cairns.

"Staff were concerned when only two weeks ago it was announced that the furnace wouldn't be re-lined for at least another two years."

But the company said the furnace was in good repair, routinely maintained and was not due to be re-lined until 2005.

A minute's silence has been planned for Thursday at 1717GMT - exactly a week after the blast - as the town continues to mourn.

Corus, South Wales Police and the Health and Safety Executive have all launched investigations into the incident.