Solution heat treatment followed by partial artificial aging for balanced strength.
However, it is not a tutorial; it is a specification sheet. If you do not have a background in metallurgy, the tables will be difficult to interpret. For the professional, it is a 5-star reference document. For the hobbyist, it is a confusing list of numbers.
The standard provides a comprehensive framework for the production and inspection of aluminum alloys, specifically covering: Alloy Designations
The standard defines the mechanical properties required for each alloy, including tensile strength (( \sigma_B )), yield strength (( \sigma_0.2 )), and elongation (( \delta )), which are essential for engineering design. These properties vary depending on the alloy type and the casting method employed. gost 2685-75 pdf
Full PDF versions of the standard are often archived in official regulatory libraries. You can find detailed metadata or purchase access through the RussianGost Official Regulatory Library or view status information on NormaCS . RussianGost|Official Regulatory Library - GOST 2685-75
The standard classified cast aluminum alloys into five distinct categories based on their primary alloying elements. The table below details these groups and provides the most common examples of alloys within each:
GOST 2685-75 mandates specific mechanical properties that must be met during quality assurance testing. Properties vary significantly based on the casting method (Sand vs. Die) and heat treatment condition (T1, T4, T6, etc.). Solution heat treatment followed by partial artificial aging
| | Fe (%) | Si (%) | Mg (%) | Cu (%) | Zn (%) | Ni (%) | Al (%) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | AL1 (GOST 2685-75) | < 0.8 | < 0.7 | 1.25–1.75 | 3.75–4.5 | < 0.1 | 1.75–2.25 | 90.1–93.25 | | AL6 (GOST 2685-75) | ≤ 1.1 | 4.5–6 | ≤ 0.1 | 2–3 | ≤ 0.3 | - | Rest | | AL8 (GOST 2685-75) | ≤ 0.3 | ≤ 0.3 | 9.3–10 | ≤ 0.1 | ≤ 0.1 | - | Rest |
Stands for Alyuminiy Liteyny (Aluminum Casting). The numeral following it represents the chronological development or registration number of the specific alloy formulation (e.g., AL4 or AL9 ).
: Outlines required tensile strength, hardness, and ductility based on the specific casting method and heat treatment applied. For the professional, it is a 5-star reference document
: High fluidity, low shrinkage, but not heat-treatable.
found it: a worn, gray binder labeled . To the untrained eye, it was just a collection of technical specifications, but to Vasily, it was the "Alchemist’s Ledger" of the 1970s. The Standard of Strength