Exhibit 10.4

EXECUTION COPY

AMENDMENT NO. 4

Dated as of February 28, 2011

to

PURCHASE AND SALE AGREEMENT

Dated as of November 30, 2000

This AMENDMENT NO. 4 (this “Amendment”), dated as of February 28, 2011, is entered into among the VARIOUS ENTITIES LISTED ON SCHEDULE I HERETO AS ORIGINATORS (each, a “Remaining Originator”; and collectively, the “Remaining Originators”), DIETRICH INDUSTRIES, INC., a Pennsylvania corporation (the “Released Originator”), and WORTHINGTON RECEIVABLES CORPORATION, a Delaware corporation (the “Company”).

RECITALS

WHEREAS, the Remaining Originators and the Released Originator have entered into that certain Purchase and Sale Agreement dated as of November 30, 2000 (as amended, supplemented or otherwise modified through the date hereof, the “Agreement”);

WHEREAS, the parties hereto wish to make certain changes to the Agreement as herein provided;

NOW, THEREFORE, in consideration of the promises and the mutual agreements contained herein and in the Agreement, the parties hereto agree as follows:

SECTION 1. Definitions. All capitalized terms not otherwise defined herein are used as defined in the Agreement (including terms incorporated therein by reference).

SECTION 2. Amendments to Agreement. The Agreement is hereby amended as follows:

2.1 The parties hereto hereby agree that upon the effectiveness of this Amendment, the Released Originator shall no longer be party to the Agreement or any other Transaction Document and shall no longer have any obligations or rights thereunder (other than such obligations which by their express terms survive termination of the Agreement or such other Transaction Document, as applicable).

2.2 Schedule I of the Agreement is hereby amended and restated in its entirety as set forth on Schedule I attached hereto.

2.3 Schedule 5.15 of the Agreement is hereby amended and restated in its entirety as set forth on Schedule 5.15 attached hereto.

2.4 Schedule 6.1(f) of the Agreement is hereby amended and restated in its entirety as set forth on Schedule 6.1(f) attached hereto.

SECTION 3. Authorization to File Financing Statements. Upon the effectiveness of this Amendment, each of the Released Originator and the Company hereby authorizes the Administrator to file (at the expense of the Company) one or more UCC-3 amendments in the form of Exhibit A hereto.

SECTION 4. Miscellaneous.

4.1 Representations and Warranties.

(a) Each Remaining Originator and the Company hereby makes, with respect to itself, the following representations and warranties to the other parties hereto, the Administrator and each member of each Purchaser Group:

(i) Representations and Warranties. The representations and warranties contained in Article V of the Agreement of such Remaining Originators are true and correct as of the date hereof (unless stated to relate solely to an earlier date, in which case such representations and warranties were true and correct as of such earlier date);

(ii) Enforceability. The execution and delivery by such Person of this Amendment, and the performance of its obligations under this Amendment and the Agreement, as amended hereby, are within its organizational powers and have been duly authorized by all necessary organizational action on its part. This Amendment and the Agreement, as amended hereby, are its valid and legally binding obligations, enforceable in accordance with its terms; and

(iii) Termination Event. No Purchase and Sale Termination Event or Unmatured Purchase and Sale Termination Event has occurred and is continuing.

(b) The Company hereby represents and warrants to the other parties hereto, the Administrator and each member of each Purchaser Group, with respect to itself, that:

(i) Representations and Warranties. Its representations and warranties contained in Exhibit III of the Receivables Purchase Agreement are true and correct as of the date hereof (unless stated to relate solely to an earlier date, in which case such representations or warranties were true and correct as of such earlier date); and

(ii) No Default. Both before and immediately after giving effect to this Amendment and the transactions contemplated hereby, no Termination Event or Unmatured Termination Event exists or shall exist.

4.2 Effectiveness. This Amendment shall become effective as of the date hereof upon (i) receipt by the Company and the Administrator of: (a) counterparts of this Amendment, (b) counterparts of the Assignment Agreement, dated as of the date hereof, between the Seller and Dietrich Industries, Inc. (and acknowledged and consented to by PNC and the Purchaser), in each case (whether by facsimile or otherwise) executed by each of the other parties hereto or thereto, as applicable, and (c) such other documents, agreements, instruments and opinions as the Administrator may request and (ii) the cancellation and return to the Company (with a copy to the Administrator) of the original Company Note in favor of the Released Originator.

4.3 References to Agreement. Upon the effectiveness of this Amendment, each reference in the Agreement to “this Agreement”, “hereunder”, “hereof”, “herein”, or words of like import shall mean and be a reference to the Agreement as amended hereby, and each reference to the Agreement in any other document, instrument or agreement executed and/or delivered in connection with the Agreement shall mean and be a reference to the Agreement as amended hereby.

4.4 Effect on the Agreement. Except as specifically amended above, the Agreement and all other documents, instruments and agreements executed and/or delivered in connection therewith shall remain in full force and effect and are hereby ratified and confirmed.

4.5 No Waiver. The execution, delivery and effectiveness of this Amendment shall not operate as a waiver of any right, power or remedy of any party under the Agreement or any other document, instrument or agreement executed in connection therewith, nor constitute a waiver of any provision contained therein, except as specifically set forth herein.

4.6 Governing Law. This Amendment, including the rights and duties of the parties hereto, shall be governed by, and construed in accordance with, the laws of the State of New York (without giving effect to the conflicts of law principles thereof other than Sections 5-1401 and 5-1402 of the New York General Obligations Law).

4.7 Successors and Assigns. This Amendment shall be binding upon and shall inure to the benefit of the parties hereto and their respective successors and assigns.

4.8 Headings. The Section headings in this Amendment are inserted for convenience of reference only and shall not affect the meaning or interpretation of this Amendment or any provision hereof.

4.9 Counterparts. This Amendment may be executed by the parties hereto in several counterparts, each of which shall be deemed to be an original and all of which shall constitute together but one and the same agreement.

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IN WITNESS WHEREOF, the parties have caused this Amendment to be executed by their

respective officers thereunto duly authorized, as of the date first above written.

SCHEDULE I

Schedule I

LIST OF ORIGINATORS

The Gerstenslager Company, a Michigan corporation

The Worthington Steel Company, a Delaware corporation

The Worthington Steel Company, a North Carolina corporation

The Worthington Steel Company, an Ohio corporation

Worthington Cylinders Wisconsin, LLC, an Ohio limited liability company

Worthington Steel Company of Decatur, L.L.C., an Alabama limited liability company

Worthington Steel Company of Kentucky, LLC, a Kentucky limited liability company

Worthington Steel of Michigan, Inc., a Michigan corporation

Worthington Cylinders Corporation, an Ohio corporation

SCHEDULE 5.15

Schedule 5.15

TRADE NAMES

The Worthington Steel Company, a Delaware corporation, was originally incorporated as Worthington Ventures, Inc., a Delaware corporation, in March 1992. The Worthington Steel Company, a Pennsylvania corporation, which held the Malvern, PA facility, merged with an into Worthington Ventures, Inc. on November 26, 1996 as part of a corporate reorganization. Worthington Ventures, Inc., a Delaware corporation, was the surviving entity and changed its name to The Worthington Steel Company.

The Worthington Steel Company, an Ohio corporation, was originally incorporated on February 10, 1998 as The Worthington Steel Company of Ohio, Inc. On May 22, 1998, as part of a corporate reorganization, its name was changed to the current name, The Worthington Steel Company.

SCHEDULE 6.1(f)

Schedule 6.1(f)

LOCATION OF EACH ORIGINATOR

LOCATION OF CHIEF EXECUTIVE OFFICE AND PRINCIPAL PLACE OF

BUSINESS OF EACH ORIGINATOR

LOCATION OF BOOKS AND RECORDS OF ORIGINATORS

EXHIBIT A

UCC-3s TO BE FILED

(attached)

UCC FINANCING STATEMENT AMENDMENT

FOLLOW INSTRUCTIONS (front and back) CAREFULLY

FILING OFFICE COPY — UCC FINANCING STATEMENT AMENDMENT (FORM UCC3) (REV. 05/22/02)