The standard strictly defines the permissible ranges for alloying elements and maximum impurity limits. Impurities such as Iron (Fe), Nickel (Ni), and Copper (Cu) are strictly limited due to their detrimental effect on the corrosion resistance of magnesium.
The standard text and PDFs are available from national standards distributors and archival collections of GOST documents; newer consolidated standards (replacements) are published separately. (Search for "ГОСТ 2685-75 PDF" or the replacement "ГОСТ 1583-89" at standards libraries or authorized publishers.)
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GOST 2685-75 is a retired Soviet-era technical standard that defines the grades, technical requirements, and testing methods for aluminum casting alloys. It was officially replaced by GOST 1583-89 on January 1, 1990. Key Features of GOST 2685-75 gost 2685-75 pdf
Scope: Specifies standards for aluminum alloys used in producing shaped castings through various methods, including sand molding, shell molding, investment casting, and die casting.
Alloy Grades: Covers common cast aluminum alloys such as AL4 (АЛ4), AL9 (АЛ9), and AL19 (АЛ19). Technical Requirements:
Chemical Composition: Sets strict limits on primary alloying elements (like Silicon, Copper, and Magnesium) and allowable impurities (such as Iron). The standard strictly defines the permissible ranges for
Mechanical Properties: Outlines required tensile strength, hardness, and ductility based on the specific casting method and heat treatment applied.
Impurity Controls: For example, it specifies that the total allowable impurities for sand and shell molding should generally not exceed .
Heat Treatment: References specific heat treatment regimes (e.g., T2 condition) required to achieve desired physical characteristics or to relieve internal stresses. Standard History: Inception: Introduced on January 1, 1977. Predecessor: Replaced GOST 2685-63. Successor: Superseded by GOST 1583-89. Official Documentation GOST 2685-75 is a retired Soviet-era technical standard
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
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Standard Designation: GOST 2685-75 Title: Magnesium casting alloys. Grades Status: Interstate Standard (CIS) Applicability: Metallurgy, Aerospace Engineering, Automotive Industry
To validate quality, the GOST specifies: