SCHEDULE 14A INFORMATION

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE
SECURITIES EXCHANGE ACT OF 1934

(AMENDMENT NO.___)

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o Definitive Proxy Statement

o Preliminary Proxy Statement

o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

þ Definitive Additional Materials

o Soliciting Material Pursuant to §240.14a-12

Reliance Steel & Aluminum Co.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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M21430-P91552 *** Exercise Your Right to Vote *** IMPORTANT NOTICE Regarding the Availability of Proxy Materials Meeting Information Meeting Type: Annual For holders as of: 4/1/10 Date: 5/19/10 Time: 10:00 a.m. PDT Location: The Omni Hotel 251 South Olive Street Los Angeles, CA 90012 RELIANCE STEEL & ALUMINUM CO. You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. See the reverse side of this notice to obtain proxy materials and voting instructions.

M21431-P91552 Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENT ANNUAL REPORT FORM 10-K How to View Online: Have the 12-Digit Control Number available (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE:1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the 12-Digit Control Number (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 5, 2010 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote In Person: If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the 12 Digit Control Number available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a voting instruction form.

M21432-P91552 Voting Items The Board of Directors recommends that you vote FOR the following: 1. Election of Directors Nominees: 01) David H. Hannah 02) Mark V. Kaminski 03) Gregg J. Mollins 04) Andrew G. Sharkey, III The Board of Directors recommends you vote AGAINST the following proposal: 2. Shareholder Proposal: Elect each Director annually. The Board of Directors recommends you vote FOR the following proposals: 3. To ratify KPMG LLP as the Independent public accounting firm to perform the annual audit of our 2010 financial statements. 4. In the proxyholders’ discretion on such other matters as may properly come before the meeting.