GOST 34776-2021 PDF

Full title and description

GOST 34776-2021 — "Rare earth metals. Terms and definitions". The standard establishes unified terminology and definitions used for rare-earth metals, their alloys and related metallurgical materials and processes.

Abstract

This interstate (GOST) standard defines terms and definitions for rare-earth metals and related materials — including master alloys, ferroalloys, modified alloys and key refining and production processes — to ensure consistent use of terminology across technical documentation, specifications, testing and trade in member states.

General information

• Status: Active / in force (interstate standard).
• Publication date: Effective date (date of introduction into force): 01 July 2022; approved by Rosstandart on 09 November 2021.
• Publisher: Interstate standard (adopted/registered by Rosstandart / EASC framework).
• ICS / categories: 77.120.99 (metallurgy — rare-earth metals and compounds).
• Edition / version: GOST 34776-2021 (first edition, 2021).
• Number of pages: 16 pages.

Scope

GOST 34776-2021 standardizes terminology related to rare-earth metals and their products: definitions of rare-earth elements and metals, classification of alloys (including master alloys and ferroalloys), compositional terms (mass fraction/content of rare-earth metal), and names of common production and refining processes (vacuum refining, electron-beam refining, joint reduction, restoration-diffusion and others). It is intended for use in standards, technical specifications, production documentation and scientific and laboratory work where unambiguous terminology is required.

Key topics and requirements

• Definitions of "rare-earth metal" and related basic terms.
• Classification and definitions for rare-earth master alloys, rare-earth ferroalloys, ferrosilicon/ferrosilicon-magnesium alloys, and rare-earth-containing aluminium, magnesium and copper alloys.
• Terms for compositional measures (mass fraction, total rare-earth content) and naming conventions for alloys and intermetallic compounds.
• Definitions of common production and refining processes (vacuum refining, electron-beam refining, joint reduction, restoration-diffusion, combined reduction processes).
• Terminology for modified and alloyed products (e.g., modified aluminium/magnesium/copper alloys containing rare-earth elements) and notes on typical alloy systems (Nd-Mg, Y-Mg, La-Cu, Dy-Fe, etc.).

Typical use and users

Used by metallurgical and materials engineers, manufacturers of rare-earth metals and alloys, quality laboratories and testing agencies, standards and regulatory bodies, procurement and technical documentation authors, and researchers working with rare-earth materials who require consistent terminology across specifications and reports.

Related standards

Related documents include other GOST and national standards on non‑ferrous metals and alloys, metallurgical terminology and testing methods, and interstate standardization rules (for example, foundational GOST documents governing terminology and standardization procedures). Implementers typically consult complementary standards covering sampling, chemical analysis and technical conditions for specific rare-earth products.

Keywords

rare earth metals, rare-earth elements, master alloy, ferroalloy, ferrosilicon, rare-earth alloys, mass fraction, refining processes, vacuum refining, electron-beam refining, terminology, GOST 34776-2021.

FAQ

Q: What is this standard?

A: GOST 34776-2021 is an interstate standard that defines terms and definitions used for rare-earth metals and associated alloys and processes, providing a common vocabulary for industry and regulatory documents.

Q: What does it cover?

A: It covers definitions of rare-earth metals and elements, classification of related alloys (master alloys, ferroalloys, modified alloys), compositional and content terms, and names of key metallurgical and refining processes applicable to rare-earth materials.

Q: Who typically uses it?

A: Metallurgists, material scientists, manufacturers of rare-earth products, testing and quality laboratories, standards bodies and technical writers preparing specifications, procurement and conformance documentation.

Q: Is it current or superseded?

A: The standard is current (active). It was approved by Rosstandart on 09 November 2021 and became effective (introduced) on 01 July 2022.

Q: Is it part of a series?

A: It is a standalone terminology standard within the broader set of GOST documents that address non‑ferrous metals, alloys and metallurgical methods; users commonly apply it together with technical specifications and testing standards for specific rare‑earth products.

Q: What are the key keywords?

A: Rare earth metals; rare-earth elements; master alloy; ferroalloy; rare-earth alloys; refining processes; terminology; GOST.