Temper Terminology
Age Hardenable Tempers - This term means the material can be strengthened by simple heat treatment after stamping or forming. The strength level will be roughly doubled by optimum heat treatment. | ||
ASTM Designation | Description | Name |
TB00 TD01 TD02 TD04 |
Annealed Quarter Hard Half Hard Hard |
A 1/4 H 1/2 H H |
Heat Treated Tempers - These tempers describe the resulting strength after optimum heat treatment of their age hardenable counter parts. |
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ASTM Designation | Description | Name |
TF00 TH01 TH02 TH04 |
Annealed & Heat Treated Quarter Hard & Heat Treated Half Hard & Heat Treated Hard & Heat Treated |
AT 1/4 HT 1/2 HT HT |
Mill Hardened Tempers - These tempers have been heat treated through carefully controlled processing to develop a strength level between age hardenable and fully heat treated tempers. They are normally formed and put into service at this strength. They are also used to provide sturdy, miniature parts for subsequent full heat treatment. This approach protects small parts from damage and improves dimensional stability during final heat treatment. |
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ASTM Designation | Name | |
TM00 TM01 TM02 TM04 TM05 TM06 TM08 |
AM 1/4 HM 1/2 HM HM SHM XHM XHMS |