Stephen Galsworthy was killed in the blast

Four men are in a lower dependency unit at the hospital, two were discharged on Saturday and two remain in general hospital wards.

Three teams of surgeons will work back-to-back shifts over the next few days to treat those most seriously hurt.

Several are due to undergo state-of-the-art surgery for extensive burns and lung injuries.

Corus said the blast was caused by an escape of molten iron at blast furnace number five on the sprawling site.

A team of 30 police officers is working with health and safety officials on an investigation into the blast.

Specialist police teams are also working with the families of the bereaved and injured.

'Gentle giant' dead

Keen football fan Stephen Galsworthy was the first of the two men confirmed dead.

The second victim was named by police as 20-year-old Andrew Hutin from Port Talbot. His body was recovered from the site by a specialist rescue crew on Friday.

Andrew Hutin: Body found by rescuers

Mr Galsworthy, 25, from Baglan Moors in Port Talbot, was described as a "gentle giant" by the secretary of Afan Lido Football Club, for whom he used to play.

He was the youngest of five children and his family confirmed that he had been due to marry next year to his girlfriend of six years, Clare Robbins.

Mr Hutin was reported to have been only working on Thursday night to help a colleague.

A statement issued by his parents, Michael and Lynne, said their were "devastated" by their loss.

They described Mr Hutin as "a loyal son and supportive of his parents and sisters".

Hamish Laing, clinical director at Morriston Hospital - which boasts one of the UK's leading burns units - said the injuries were various.

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"In this sort of event where you have an explosion, there's obviously burns from the flames," he said.

"But patients are often thrown considerable distances and they've suffered broken bones, dislocated shoulders and injuries to the lungs, affected by the blast and hot gases."

Hospital officials said on Saturday it was positive news that two of the men could be discharged, but staff remain concerned for the six seriously injured men.

They are receiving round-the-clock treatment.

Meanwhile, Corus chiefs said the site had been made safe and that all shifts in all parts of the site were going ahead as normal.