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Cold Rolled Tempers

Cold working of copper and copper alloys, by rolling or other methods, will increase both tensile strength and yield strength in a very predictable manner. Most copper alloys are produced to a series of cold-rolled tempers with a tensile strength range unique to each alloy and temper designation. For this reason, there are considerably fewer variations in cold-rolled tempers than in annealed tempers. The common cold-rolled temper names and designations are:


Annealed
Oxx


Quarter Hard
H01


Three Quarter Hard
H03


Extra Hard
H05


Eighth Hard
H00


Half Hard
H02


Hard
H04


Spring
H06

Metal Handbook, 8th Edition, Vol 7, Atlas of Microstructures of Industrial Alloys, edited by Taylor Lyman, (1972), ASM International, Materials Park, OH 44073-0002 (formerly American Society for Metals, Metals Park, OH 44073), p 283 (fig. 2333,2336,2339), p 284 (fig. 2342, 2345, 2348), p. 285 (fig 2351, 2354, 2357).

Most, but not all, alloys are rolled to meet specific standard tensile strengths for each of these tempers. Alloy C26000 will have the following nominal tensile strengths for each temper listed in Table 2.

Table 2. Rolled Tempers Mechanical Properties
Rolled Temper Nominal Reduction, % Tensile Strength
ksi		 Yield Strength
(0.5% Ext.)
ksi		 Elongation
in 2.0 inches, %
H01 ¼ Hard 11 54 40 43
H02 ½ Hard 21 62 50 23
H04 Hard 37 76 60 8
H06 Extra Hard 50 86 62 5
H08 Spring 60 94 62 3

A complete listing of temper designations and descriptions for copper and copper alloys cane found in ASTM B601 Standard Practice for Temper Designations for Copper and Copper Alloys—Wrought and Cast. Additional information on physical properties and cold-rolled tempers is available in data sheets from material suppliers, ASM Metals Handbook, Volume 2.