MT Arcelor Mittal New

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 6-K

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REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

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Dated August 6, 2013

Commission file number 001-35788

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ARCELORMITTAL

 (Translation of Registrant’s name into English)

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19, Avenue de la Liberté, L-2930 Luxembourg,

Grand Duchy of Luxembourg

(Address of Registrant’s principal executive offices)

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Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F   x             Form 40-F   ¨   

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨   

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨   

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes   ¨              No   x   

If “Yes” marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-

THIS REPORT ON FORM 6-K SHALL BE DEEMED TO BE INCORPORATED BY REFERENCE IN THE REGISTRATION STATEMENT ON FORM F-3 (NO. 333-179763) OF ARCELORMITTAL AND THE PROSPECTUSES INCORPORATED THEREIN.

The Company is refiling the consent of Deloitte Audit S.à.r.l. included in the Form 6-K of ArcelorMittal dated August 2, 2013 to correct a typographical error contained therein.

Exhibit List