EXHIBIT 21.1 SUBSIDIARIES OF THE REGISTRANT The following lists the subsidiaries of Allegheny Technologies Incorporated, excluding those subsidiaries which, considered in the aggregate as a single subsidiary, do not constitute a significant subsidiary. The subsidiaries listed are all wholly owned, either directly or indirectly except for STAL, in which a subsidiary of Allegheny Technologies Incorporated holds a 60% interest. <Table> <Caption> Name of Subsidiary State of Incorporation - ------------------ ---------------------- ATI Funding Corporation Delaware Allegheny Ludlum Corporation Pennsylvania TDY Holdings LLC Delaware TDY Industries, Inc. California Jessop Steel Company Pennsylvania Oregon Metallurgical Corporation Oregon AII Acquisition Corp. Delaware ALC Funding Corporation Delaware Shanghai STAL Precision Stainless Steel Co., Limited ("STAL") People's Republic of China </Table>