The downward revision will reflect the weak credit profile of CSN, S&P said.
The rating on Cimpor, which currently stands at BBB-, was put under credit watch with "negative" outlook. The current rating of Cimpor is supported by high operating margins and solid cash flow.
CSN, in turn, is rated BB+ by S&P -- lower than Cimpor. The outlook on
CSN is also "negative".