1

                                                                    Exhibit 5.1


                                     [LOGO]

USX CORPORATION                                 DAN D. SANDMAN
600 GRANT STREET                                GENERAL COUNSEL, 
PITTSBURGH, PA 15219-4776                       SECRETARY AND
412 433 1117                                    SENIOR VICE PRESIDENT- 
FAX 412 433 2015                                HUMAN RESOURCES

May 2, 1996

Board of Directors
RMI Titanium Company
Post Office Box 269
1000 Warren Avenue
Niles, Ohio 44446

Dear Sirs:

I am General Counsel, Secretary and Senior Vice President-Human Resources of USX
Corporation, a Delaware corporation ("USX"). The Law Department of USX and of
its U.S. Steel Group (the "USX/USS Law Department") has acted as special counsel
to RMI Titanium Company, an Ohio corporation ("RMI"), in connection with the
proposed secondary offering of up to 2,300,000 shares of RMI common stock, par
value $.01 per share (the "RMI Shares"), owned by USX (the "Selling
Shareholder") and in the preparation and filing of a registration statement on
Form S-3 (the "Registration Statement") with respect thereto. As of the date
hereof, and at all times while the USX/USS Law Department has represented RMI,
USX has owned in excess of 50% of the outstanding shares of common stock of RMI.

I have examined, or have caused attorneys in the USX/USS Law Department to
examine, RMI's Amended Articles of Incorporation, RMI's Amended Code of
Regulations and the resolutions adopted by RMI's Board of Directors on April 25,
1996 authorizing the registration of the Shares and related matters. I have
examined, or caused to be examined, such other documents, corporate records and
certificates of corporate officers and public officials as I have deemed
relevant or necessary to giving the opinion set forth below. In rendering this
opinion, I have presumed the genuineness of all documents examined and the
correctness of all statements of facts contained in the examined certificates of
corporate officers and public officials.

Based on the foregoing, I am of the opinion that the RMI Shares are duly
authorized; the issuance of the RMI Shares has been approved by all necessary
corporate action; and, they will be legally issued, fully paid and
non-assessable.

I hereby consent to the filing of this opinion as an exhibit to the 
Registration Statement.

Very truly yours,

/s/ DAN D. SANDMAN

Dan D. Sandman


Marathon Group - U.S. Steel Group - Delhi Group