The designations for temper are used for all forms of magnesium and magnesium-alloy products except ingots. They are based on the sequence of basic treatments used to produce the various tempers. The temper designation follows the alloy designation, the two being separated by a dash.Basic temper designation consists of letters. Subdivisions of the basic tempers, where required, are indicated by a digit or digits following the letter. These designate specific sequences of basic treatments, but only operations recognized as significantly influencing the characteristics of the product.
This article covers a system or designating the tempers of magnesium alloys, cast and wrought. The designations used in ASTM specifications are under the jurisdiction of committee B-7 for magnesium alloy castings and wrought products.
The designations for temper are used for all forms of magnesium and magnesium-alloy products except ingots. They are based on the sequence of basic treatments used to produce the various tempers. The temper designation follows the alloy designation, the two being separated by a dash.
Basic temper designation consists of letters. Subdivisions of the basic tempers, where required, are indicated by a digit or digits following the letter. These designate specific sequences of basic treatments, but only operations recognized as significantly influencing the characteristics of the product are indicated. Should some other variation of the same sequence of basic operations be applied to the same alloy, resulting in different characteristics, then additional digits are added to the designation.
The temper designations and the subdivisions are fully defined and explained in Table 1. A brief outline for quick reference is given in Table 2.
Table 1. Temper Designations
The digit following the designation H1, H2 and H3 indicates the final degree of strain-hardening. Tempers between 0 (annealed) and 8 (full hard) are designated by numerals 1 through 7. Material having a strength about midway between that of the 0 temper and that of the 8 temper is designated by the numeral 4 (half hard), between 0 and 4 by the numeral 2 (quarter hard), between 4 and 8 by the numeral 6 (three-quarter hard), etc.
The third digit, when used, indicates a variation of a two-digit H temper. It is used when the degree of control of temper or the mechanical properties are different from but close to those for the two-digit H temper to which it is added. Numerals 1 through 9 may be arbitrarily assigned for an alloy and product to indicate a specific degree of control of temper or specified mechanical property limits.
Table 2. Basic Temper Designations and Subdivisions
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