Nearly 900 steel workers from BlueScope's New Zealand operations will go on strike for a second time in 24 hours tomorrow.
The protests follow six months of stalled pay talks, and what union members believe to be low-ball pay offers from BlueScope.
Joe Gallagher, E tū union industry co-ordinator, said BlueScope refuses to budge on their offer.
"While our Government is committed to lifting wages, internationally employers are co-ordinating a strategy to hold wages down," Gallagher said.
"There is a clear and growing trend of top multi-national companies presenting low pay offers, despite big profits. We're seeing this in the mining sector, with the low-ball offer to our members at OceanaGold, and other sectors are sending the same message."