Strikes are on the table at Tata Steel in Scunthorpe as the company tries to force through more than 1,000 job cuts.
Sean Scorer, acting chair of the multi-union committee, said talks were close to breaking down.
“We believe we are being faced with a clear strategy of confrontation and are in the process of consulting with our members,” he added.
Some of the redundancies are voluntary—but workers say the firm is now looking at compulsory redundancies as well as attacking conditions.
Some 185 workers in the bloom and billet mill, which the company wants to shut down at the end of October, are asking to be balloted.