The Harrogate agency will lead a programme of brand development, website design and internal communications.
Severfield-Rowen is the largest specialist steelwork business in the UK and one of the largest in Europe, employing 1,200 people with an annual turnover of around £250 million. Its other projects include The Shard, Wimbledon Centre Court and the London Olympics stadium.
Acceleris will be working on the brief with fellow Yorkshire agencies Thompson Brand Partners and Kariba.
Managing director Peter Davenport said: “We are delighted to be appointed on this important project for a company that has helped create some of the most iconic and stand-out buildings in the UK, structures that are enjoyed and experienced by 10s of millions of people every year in their working, sporting, social and leisure lives.”