Toronto, July 13 - Labour trouble is brewing at ArcelorMittal Dofasco, the Canadian subsidiary of the global steel giant, with its slag-recycling workers on the warpath over contract terms.

The steelworkers at the company's plant at Hamilton near Toronto are employed by MultiServ, a Pennsylvania-based US company, which has a slag-recycling contract with ArcelorMittal Dofasco.

The steel workers have voted for strike after failing to reach an agreement over renewal terms for their contract. The contract for 150 of them expired July 4.

After voting for strike when the workers showed up for work at the plant Friday, they were 'escorted out' of the plant by supervisors for MultiServ.

The workers said they came to work despite their decision to go on strike from July 4 because they wanted to resolve the issue with their employers.

Tony DePaulo, leader for United Steelworkers, said MultiServ wants to cut their wages by 15 percent and reduce pension and other benefits.

He said MultiServ 'is a very profitable company that is using the current economic conditions as an excuse to make long-term and structural changes to their livelihood.