EXHIBIT 23.01

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 333-179182 and No. 333-171217) of Gerdau S.A. of our report dated March 30, 2015 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 20-F.

/s/ PricewaterhouseCoopers

PricewaterhouseCoopers Auditores Independentes

Rio de Janeiro, Brazil

March 30, 2015