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Strain-hardened, partially annealed quarter hard H2 Strain-hardened, partially annealed half hard H4 Strain-hardened, partially annealed three quarter hard H6 Strain-hardened, partially annealed fully hard H8 Strain-hardened and stabilised, quarter hard H2 Strain-hardened and stabilised, half hard H4 Strain-hardened and stabilised, three quarter hard H6 Strain-hardened and stabilised, fully hard H8 Explanations of symbols used above.
Term Description Cold Work The nomenclature denotes the degree of cold work imposed on the metal by using the letter H followed by numbers. The first number indicates how the temper is achieved. H1x Strain-hardened only to obtain the desired strength without supplementary thermal treatment.
H2x Strain-hardened and partially annealed. These designations apply to products which are strain-hardened more than the desired final amount and then reduced in strength to the desired level by partial annealing. For alloys that age-soften at room temperature, the H2x tempers have the same minimum ultimate tensile strength as the corresponding H3x tempers.
For other alloys, the H2x tempers have the same minimum ultimate tensile strength as the corresponding H1x tempers and slightly higher elongation. H3x Strain-hardened and stabilised. These designations apply to products which are strain-hardened and whose mechanical properties are stabilised either by a low temperature thermal treatment or as a result of heat introduced during fabrication.
Stabilisation usually improves ductility. This designation is applicable only to those alloys which, unless stabilisedgradually age soften at room temperature. H4x H4x Strain-hardened and lacquered or painted.
These designations apply to products which are strain-hardened and which may be subjected to some partial annealing during the thermal curing which follows the painting or lacquering operation.
The second number after H indicates the final degree of strain-hardening, number 8 being the hardest normally indicated. The third digit after H, when used, indicates a variation of a two digit temper.
It is used when the degree of control of temper or the mechanical properties or both differ from, but are close to, that or those for the two digit H temper designation to which it is added, or when some other characteristic is significantly affected.
To illustrate; it can be seen that denotes a particular aluminium manganese alloy in the annealed, soft condition, whilst H16 denotes the same alloy strain-hardened to three quarters hard.
For example, is an aluminium manganese alloy in the soft annealed condition and H16 is the same alloy three quarters hard.
With the flexibility of compositions, degree of cold work and variation of annealing and temperature a wide range of mechanical properties can be achieved especially in sheet products.
Age hardening is also called precipitation hardening, because it causes a precipitate to form within the metal. Unlike quenching for hardness, these alloys must be kept at elevated temperature for hours to allow precipitation to take place.A door is a panel made usually of a hard, impermeable, and hard-to-break substance (such as wood or metal), with or without windows, but sometimes consisting of a hard frame into which glass or screens have been fitted, attached to hinges by which it is attached to a frame that constitutes a space for ingress into or egress from a building, room, or vehicle, such that the panel may be moved in.
Non-ferrous means every metal except iron and steel. (i.e. Not mostly Fe). Aluminium is the number 2 metal. (After steel of course). Sheet Metal Worker Cover Letter.
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