BS EN 515 2017 pdf free download.Aluminium and aluminium alloys — Wrought products — Temper designations
4 Basis of codification
4.1 The temper designations are based on the sequences of basic treatments used to produce the various tempers. Property (mechanical or physical) limits apply to individual alloy-temper-product combinations.
4.2 The temper designation follows the alloy designation; these are separated by a hyphen.
4.3 Basic temper designations consists of letters. If subdivisions of the basic tempers are required, these are indicated by one or more digits following the letter of the basic temper. These digits relate to a specific sequence of basic treatments, but only those treatments or operations recognized as significantly influencing the products characteristics 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.
5 Basic temper designations
5.1 F – as fabricated This designation applies to the products of shaping processes in which no special control over thermal conditions or strain hardening is applied. For this temper, there are no mechanical property limits specified.
5.2 O – Annealed This designation applies to products which are annealed to obtain the lowest strength temper. The O may be followed by a digit other than zero 1 .
5.3 H – Strain-hardened This designation applies to products subjected to the application of cold work after annealing (or after hot forming), or to a combination of cold work and partial annealing or stabilizing, in order to secure the specified mechanical properties.
The letter H is always followed by at least two digits, the first indicating the specific combination of basic operations and the second indicating the degree of strain hardening. A third digit indicates the variation of a two digits temper and it is used when mechanical properties, or others characteristics, differ from those of the two digits H temper to which it is added.
5.4 W – Solution heat-treated
This designation describes an unstable temper. It applies only to alloys which spontaneously age at room temperature after solution heat-treatment. This designation is specific only when the period of natural ageing is indicated; for example W 1/2 h.
5.5 T – Thermally treated to produce stable tempers other than F, O or H (for heat-treatable
alloys only)
This designation applies to products which are thermally treated, with or without supplementary strainhardening, to produce stable tempers. The T is always followed by one or more digits indicating the specific sequence of treatments.
6 Subdivision of O (annealed) temper designations
6.1 O1 – High temperature annealed and slow cooled 2
This designation applies to wrought products which are thermally treated at approximately the same time and temperature required for solution heat-treatment and slow cooled to room temperature, in order to generate the correct ultrasonic response and / or provide dimensional stability. It is applicable to products which are to be machined prior to solution heat treatment by the user. Mechanical property limits are not specified.
6.2 O 2 – Thermo-mechanically processed
This designation applies to wrought products subjected to a special thermo-mechanical treatment. It is applicable to products which are to be super-plastically formed prior to solution heat treatment by the user.
6.3 O3 – Homogenized
This designation applies to continuously cast drawing stock or strip, which are subjected to a high temperature soaking treatment to eliminate or reduce segregations, thus improving subsequent formability and or response to solution heat-treatment.
7 Subdivision of H (strain-hardened) temper designations
Subdivisions are made according to the basic operations described in 5.3 and the final degree of strain hardening, as follows:
7.1 First digit after H:
The first digit following the letter H indicates the specific combination of basic operations as follows:
— H1x Strain hardened only
These designations apply to products which are strain-hardened to obtain the desired strength without supplementary thermal treatment.BS EN 515 pdf download.