EXHIBIT 21

Subsidiaries



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|Name                                                                                |  |  |  | Ownership                                                                                         |  |  |  | Jurisdiction of Incorporation
|Air & Liquid Systems Corporation                                                    |  |  |  | 100% owned by Ampco-Pittsburgh
Corporation                                                        |  |  |  | Pennsylvania                 
|                                                                                    |  |  |  |                                                                                                  
|Ampco-Pittsburgh Securities V Investment Corporation                                |  |  |  | 100% owned by Ampco-Pittsburgh
Corporation                                                        |  |  |  | Delaware                     
|                                                                                    |  |  |  |                                                                                                  
|Ampco-Pittsburgh Securities V L.L.C.                                                |  |  |  | 100% owned by Ampco-Pittsburgh
Corporation                                                        |  |  |  | Delaware                     
|                                                                                    |  |  |  |                                                                                                  
|Union Electric Steel Corporation                                                    |  |  |  | 100% owned by Ampco-Pittsburgh
Securities V L.L.C.                                                |  |  |  | Pennsylvania                 
|                                                                                    |  |  |  |                                                                                                  
|Union Electric Steel B.V.B.A.                                                       |  |  |  | 100% owned by 3048568 Nova
Scotia Company                                                         |  |  |  | Belgium                      
|                                                                                    |  |  |  |                                                                                                  
|The Davy Roll Company Limited (formerly known as Union Electric Steel (UK) Limited) |  |  |  | 100% owned by Ampco UES Sub,
Inc.                                                                 |  |  |  | England                      
|                                                                                    |  |  |  |                                                                                                  
|Union Electric Steel UK Limited (formerly known as The Davy Roll Company Limited)   |  |  |  | 100% owned by The Davy Roll
Company Limited (formerly known as Union Electric Steel (UK) Limited) |  |  |  | England                      
|                                                                                    |  |  |  |                                                                                                  
|Union Electric Steel (Hong Kong) Limited                                            |  |  |  | 100% owned by Union Electric Steel Corporation                                                    |  |  |  | Hong Kong                    

The
financial statements of all subsidiaries have been consolidated with those of the Corporation. Names of other subsidiaries have been omitted because, considered in the aggregate as a single subsidiary, they would not constitute a significant
subsidiary.



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|ampco pittsburgh | 2010 annual report |  |  |  |