GOST 24956-81 PDF

Full title and description

GOST 24956-81 — "Titanium and titanium alloys. Method for the determination of hydrogen". Establishes a vacuum‑heating extraction method for quantifying hydrogen content in titanium and titanium alloys.

Abstract

This standard specifies a laboratory method based on vacuum extraction (vacuum heating of an alloy sample, gas collection in a calibrated volume and separation of hydrogen by diffusion through a heated palladium filter) to determine hydrogen in titanium and titanium alloys. The method is intended for hydrogen mass fractions approximately in the range 0.0006 % to 0.05 %. Typical operating temperatures cited are in the region of about 880 °C–920 °C under high vacuum.

General information

• Status: Active / in force (standard introduced and maintained with later amendments noted).
• Publication date: Approved 28 September 1981; introduced (date of entry into force) commonly listed as 1 January 1983.
• Publisher: Approved by the State Committee for Standards of the USSR (Gosstandart); originally published by Izdatelstvo Standartov (Publishing House of Standards). Developed by the Ministry of Aviation Industry (USSR) according to bibliographic records.
• ICS / categories: Classified under non‑ferrous metals → titanium and titanium alloys (ICS 77.120.50).
• Edition / version: Original designation GOST 24956‑81 (1981); text and reprints show later amendments/corrections recorded in bibliographic listings.
• Number of pages: 14 pages (typical PDF/print reprints show 14 pages).

Scope

Specifies the vacuum‑heating extraction procedure for determining total hydrogen in titanium and titanium alloys. The scope covers sample selection and preparation, required apparatus and reagents, the vacuum extraction and gas collection steps, hydrogen separation by palladium diffusion and calculation/processing of results. The method is intended for routine laboratory analysis and quality/control checks where hydrogen content affects material performance.

Key topics and requirements

• Analytical principle: vacuum extraction (vacuum heating) of hydrogen from metal samples and gas collection in a calibrated volume.
• Working temperature range for extraction: example operational temperatures cited ~880–920 °C.
• Residual vacuum and gas handling: high‑vacuum conditions and calibrated gas collection required for accurate quantification.
• Hydrogen separation/detection: hydrogen is separated (diffused) through a heated palladium filter from the extracted gas mixture and quantified by pressure difference in the calibrated volume.
• Applicable hydrogen concentration range: approximately 0.0006 % to 0.05 % (method limits and practical application range given in the standard).
• Requirements for sample preparation, apparatus calibration, blank determinations and result processing (repeatability and correction procedures) are defined to ensure traceable results.

Typical use and users

Used by metallurgical and materials testing laboratories, quality assurance departments in aerospace and chemical industries, producers of titanium mill products, research laboratories studying hydrogen embrittlement and material processors who must certify hydrogen limits in titanium alloys. The method supports incoming inspection, production control and failure analysis where hydrogen content is critical to performance.

Related standards

Commonly referenced or related documents include modern international and national methods for hydrogen or light element determination in reactive metals — for example ASTM E1447 (inert‑gas fusion methods for hydrogen in titanium and titanium alloys) — and other GOST/ISO standards addressing sample preparation and titanium product specifications. Standards on sampling and preparation of titanium (e.g., later GOST/ISO documents) are often used together with GOST 24956‑81 for a complete testing workflow.

Keywords

titanium; titanium alloys; hydrogen determination; vacuum extraction; gas analysis; palladium filter; inert gas fusion (related); material testing; hydrogen content; metallurgical analysis

FAQ

Q: What is this standard?

A: GOST 24956‑81 is a national (USSR / Russian) standard that defines a laboratory method — vacuum‑heating extraction with gas collection and hydrogen separation — for determining hydrogen content in titanium and titanium alloys.

Q: What does it cover?

A: It covers sample selection and preparation, the apparatus and reagents required, the vacuum extraction procedure (heating the sample under high vacuum), gas collection in a calibrated volume, hydrogen separation (palladium diffusion) and calculation of hydrogen concentration across the method's stated range.

Q: Who typically uses it?

A: Metallurgical test labs, titanium product manufacturers, aerospace and other industries where hydrogen content affects mechanical properties, and research organizations performing hydrogen‑related materials analysis use this standard or its contemporary equivalents.

Q: Is it current or superseded?

A: Bibliographic listings and standards distributors show GOST 24956‑81 as an established standard with recorded amendments and reprints; sources indicate it remains listed/available in current collections (i.e., treated as in force in available catalogs). Users should check their national/regional standards catalog or standards body for the present legal/regulatory status before relying on it for compliance.

Q: Is it part of a series?

A: It is one of several standards concerning titanium and titanium alloys (testing methods, sampling, product specifications). It is typically used alongside related GOST/ISO/ASTM documents covering sampling, other elemental determinations and product delivery conditions.

Q: What are the key keywords?

A: titanium, titanium alloys, hydrogen, hydrogen determination, vacuum extraction, gas collection, palladium filter, metallurgical testing.