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1.Scope : the provisions of this standard aluminum alloy deformation state code. The standards apply to aluminum and aluminum products.
2．Basic principles
2. 1 Foundation status code with a capital letters said
2. 2 Sub-state basis by state code, code-named heel that one or more Arabic numerals.
Basic state code basic state divided into five kinds, as shown in the expression
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Codenamed |
name |
Direction and use |
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F |
State free processing |
Apply to the molding process, the work-hardening and heat treatment conditions for the special requirements of the products, the state of the mechanical properties of products does not set |
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O |
State annealing |
After annealing fully applicable to a minimum strength of processed products. |
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H |
Work hardening state |
Apply to increase strength through work-hardening products, product can result in the work-hardening (or not after) the intensity of the additional decrease heat treatment.
H code followed by the two or three Arabic numerals |
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W |
Solid-state melting heat treatment |
An unstable condition, applies only to the solution heat treatment, the natural aging at room temperature alloy, the state code only said that products in a natural aging stage |
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T |
State Heat Treatment |
After heat treatment applied to, after (or without) work hardening achieve stable products. T code must be behind with one or more Arabic numerals |
3．Sub-state breakdown codenamed 3.1 H state
Behind in the letter H added two Arabic numerals (as HXX state), or three Arabic numerals (as HXXX state) that the sub-H state.
3．1． HXX state
3．1．1H behind the first one was the state figures that the basic procedures, as follows:
H1 - simple work-hardening treatment status. Without the additional heat treatment applied to, the work-hardening is only to obtain the necessary strength of the state.
H2 - and not entirely work hardening annealing state. Work hardening over the extent applicable to finished product requires, as incomplete annealing, the lower the intensity of the provisions of indicators products. The natural aging soften at room temperature alloys, H2 and H3 corresponding with the same value of the minimum ultimate tensile strength; For other alloys, the corresponding H1 and H2 have the same value of the minimum ultimate tensile strength, elongation but slightly higher than the H1.
H3 - work-hardening treatment and stabilization of the state. Apply to work hardening or after heat treatment process as a result of its role in heating mechanical properties of the product to achieve stability. H3 state applies only to aging at room temperature gradually softening (unless stabilization treatment) alloy.
H4 -- Paint handling and work-hardening of the state. Apply to work hardening, the paint led to a deal with incomplete annealing products
3.1.1.2 H After the first two digital products that work hardening degree. Figure 8 that hard state. Usually the smallest state by O Table 2 provides the tensile strength and the strength of the margin and to the provisions of HX8 minimum tensile strength values. For O (annealing) and HX8 between the state of the state, should be added separately after HX code from 1-7 to the figures, the number added in September after HX expressed a greater degree than the HX8 work hardening superhard state breakdown of various HXX state code and the corresponding level of work hardening as Table 3 below:
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≤ 40
45～60
65～80
85～100
105～120
125～160
165～200
205～240
245～280
285～320
≥ 325 |
55
65
75
85
90
95
100
105
110
115
120 |
Breakdown of state code and work-hardening degree
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State code subdivision |
work-hardening degree |
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HX1 |
Ultimate tensile strength of the state is O and the median HX2 |
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HX2 |
Ultimate tensile strength of the state is O and the median HX4 |
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HX3 |
Ultimate tensile strength of the state is HX2 and the median HX4 |
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HX4 |
Ultimate tensile strength of the state is O and the median HXB |
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HX5 |
Ultimate tensile strength of the state is HX4 and the median HX6 |
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HX6 |
Ultimate tensile strength of the state is HX4 and the median HX8 |
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HX7 |
Ultimate tensile strength of the state is O and the median HX2 |
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HX8 |
Hard state |
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HX9 |
Super hard state
The smallest tensile strength of the state is 10Mpa more than HXB state |
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Note: According to the table when the HX1 ~ HX9 determine the tensile strength of the state, not to the end of 0 or 5. Should be revised to a 0 or 5 at the end of the adjacent larger value |
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