BRIEF-S&P downgrades Brazil's CSN to 'B' from 'B+'; outlook 'negative'
BY Reuters | CORPORATE | 06:39 PM EDTMarch 18 (Reuters) - Companhia Siderurgica Nacional SA
* S&P DOWNGRADES CSN TO 'B' FROM 'B+'; OUTLOOK 'NEGATIVE' Further company coverage: (Reporting by Sao Paulo newsroom)
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