Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (File Nos. 2-83780, 2-81019, 2-60469, 33-42536, 33-42997, 33-65077, 33-54045, 333-40991, 333-55667, 333-55669, 333-57774, 33-147057 and 333-147059) of Carpenter Technology Corporation of our report dated August 22, 2008, relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

August 22, 2008