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| TEXAS                                                          |   | 75-0948250 |
| (State or other jurisdiction of incorporation or organization) |   | (I.R.S. Employer Identification No.) |
|                                                           |   |   |
| One Museum Place, Suite 500                                    |   |   |
| 3100 West Seventh Street                                       |   |   |
| Fort Worth, Texas                                              |   | 76107 |
| (Address of principal executive offices)                       |   | (Zip Code) |

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| Title of each class                     |   | Name of each exchange on which registered |
| Common Stock, $1.00 par value per share |   | New York Stock Exchange |

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|     |  |  |  |
| Yes | ¨ | No | ý |

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|-----|
|     |  |  |  |
| Yes | ¨ | No | ý |

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|     |  |  |  |
| Yes | ý | No | ¨ |

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|     |  |  |  |
| Yes | ý | No | ¨ |

|                         |
|-------------------------|
|                         |  |  |  |  |  |  |  |
| Large accelerated filer | ý | Accelerated filer | ¨ | Non-accelerated filer | ¨ | Smaller Reporting Company | ¨ |

|     |
|-----|
|     |  |  |  |
| Yes | ¨ | No | ý |

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| Document |   | Parts Into Which Incorporated |
|     |   |   |

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|   | AZZ incorporated |   |
|   | (Registrant) |   |

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| Date: 5/2/2013 |   | By: /s/ David H. Dingus |
|           |   | David H. Dingus, Principal Executive Officer and Director |

|                                                           |
|-----------------------------------------------------------|
|                                                           |  |  |  |
| /s/David H. Dingus                                        |   | /s/ Dana L. Perry |   |
| David H. Dingus, Principal Executive Officer and Director |   | Dana L. Perry, Principal Financial Officer and Director |   |
|                                                      |   |   |   |
|                                                      |   |   |   |
| /s/Daniel R. Feehan                                       |   | /s/ Richard Butler |   |
| Daniel R. Feehan, Director                                |   | Richard Butler, Vice President and Controller, Principal Accounting Officer |   |
|                                                      |   |   |   |
|                                                      |   |   |   |
| /s/Martin C. Bowen                                        |   | /s/Peter A. Hegedus |   |
| Martin C. Bowen, Director                                 |   | Peter A. Hegedus, Director |   |
|                                                      |   |   |   |
|                                                      |   |   |   |
| /s/Daniel E. Berce                                        |   | /s/Dr. H. Kirk Downey |   |
| Daniel E. Berce, Director                                 |   | Dr. H. Kirk Downey, Chairman of the Board and Director |   |
|                                                      |   |   |   |
|                                                      |   |   |   |
| /s/Sam Rosen                                              |   | /s/Kevern R. Joyce |   |
| Sam Rosen, Director                                       |   | Kevern R. Joyce, Director |   |
|                                                      |   |   |   |

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| 21   | Subsidiaries of the Company. Filed Herewith. |
| 31.1 | Chief Executive Officer Certificate pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 dated May 2, 2013. Filed Herewith. |
| 31.2 | Chief Financial Officer Certificate pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 dated May 2, 2013. Filed Herewith. |
| 32.1 | Chief Executive Officer Certificate pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 dated May 2, 2013. Filed Herewith. |
| 32.2 | Chief Financial Officer Certificate pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 dated May 2, 2013. Filed Herewith. |