Precise percentages of silicon, copper, magnesium, zinc, and manganese.
Although GOST 2685-75 is a superseded standard, it remains a valuable historical document. Its detailed classification of aluminum casting alloys, with specific chemical compositions and mechanical properties, laid the groundwork for modern standards like . While not suitable for new projects, it serves as an important reference for understanding the evolution of material science in the former Soviet Union. For current applications, always refer to the latest valid version of GOST 1583 .
A: The currently active document for general technical specifications is GOST 1583-93 .
GOST 2685-75 PDF: Comprehensive Guide to Aluminum Casting Alloys (AL4, AL9, and More)
Though the standard was eventually superseded by in the late 1980s, the spirit of the '75 standard lived on. It remained a vital reference for engineers refurbishing vintage machinery or analyzing the historical durability of Soviet-era alloys. Vasily closed the file, knowing that while the physical document was gathering dust, the digital GOST 2685-75 PDF continued to guide the hands of those who built to last. OR INDIANISED BASED ON RUSSIAN ORIGINAL ISSUE - GeM
Internal combustion pistons, specialized turbine components. Deciphering the Nomenclature: "AL" vs. "AK"
Note: GOST 2685-75 is a Soviet standard number that can refer to different technical standards depending on the domain (for example, electrical, mechanical, optical, etc.). This post assumes the user is asking about the most commonly referenced GOST 2685-75 concerning photographic film and light sensitivity (photographic exposure) — a frequent topic for historians and engineers — and will flag alternatives at the end. If you meant a different domain, see the “Other possible subjects” note below.
It is crucial to understand that . Its modern replacement is GOST 1583-89 , and its subsequent revision, GOST 1583-93 (which replaced 1583-89), further refined the technical conditions for the same class of materials. For contemporary manufacturing and certification, GOST 1583-93 is the legally binding standard, superseding both 2685-75 and 1583-89.
Annealing to relieve internal casting stresses and improve dimensional stability.
: Outlines performance expectations for different techniques: Sand and Shell Molds : Often used for large, complex parts. Investment Casting : Used for high-precision models.
| | 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 |
Interstate Standard (GOST) Subject: Magnesium alloys for casting. Grades. Current Status: Active (supersedes the 1963 version, though older copies still circulate).
High mechanical strength at elevated temperatures and excellent weldability.