Tin Plate Temper Designations
Temper designations as applied to Tin Mill products are diametrically opposite to those used to indicate the degree of hardness for Cold Rolled Strip and Sheet steels. To illustrate. #1 Temper (T-1) in the Tin Mill numbering system indicates a Dead Soft condition, whereas #1 Temper as concerns C. R. Strip and Sheet Steel indicates a Full Hard Rolled Condition.
For Reference Only - To avoid confusion specify Rockwell hardness
| Temper | Aim Rockwell 30 -T Scale |
Characteristics |
|---|---|---|
| T1 | 46 - 52 | Soft for Drawing |
| T-2 | 50 - 56 | For Moderate Drawing - Some Stiffness Required |
| T-3 | 54 - 60 | Shallow Drawing for General Purpose with Fair Degree of Stiffness |
| T-4 | 58 - 64 | For General Purpose with Increased Stiffness |
| T-5 | 62 - 68 | Rephosphorized Steel- Stiffness to resist buckling |
| T-5 CA TU | 62 - 68 | Continuous Anneal Not Rephosphorized |
| T-6 | 67 - 73 | Rephosphorized Steel - for great stiffness |
| T-6 CA | 67 - 73 | Continuous Anneal Rephosphorized for Great Stiffness |