GOST 21945-76 PDF

Full title and description

GOST 21945-76 — "Seamless hot-rolled tubes from alloys based on titanium. Specifications." The standard establishes technical requirements, dimensional ranges, tolerances, material grades, heat treatment, mechanical properties, testing and marking for seamless hot-rolled titanium-alloy tubes.

Abstract

This interstate (USSR) standard specifies the assortment, dimensional limits, permissible deviations, material grades (titanium and titanium alloys), required thermal treatment, mechanical and chemical property limits, inspection and acceptance rules for seamless hot‑rolled titanium tubes used in parts and structural applications. It was issued in the 1970s and later amended; the technical requirements were intended for industrial and structural use where titanium’s properties are required.

General information

• Status: Replaced / superseded (marked as replaced/withdrawn in catalogs; superseded by GOST 21945-2023).
• Publication date: Original approval 1976 (approved June 21, 1976); introduced into force January 1, 1978.
• Publisher: State Committee for Standards of the USSR (Gosstandart) — national standards body at time of issue; later managed under national/interstate standardization authorities (now Rosstandart / interstate system for successor standard).
• ICS / categories: 23.040.10 (Tubes).
• Edition / version: Designation GOST 21945-76 (with recorded amendments during 1980s); subsequently replaced by GOST 21945-2023.
• Number of pages: Approximately 10 pages (original document).

Scope

The standard applies to seamless hot-rolled (hot‑worked) tubes manufactured from titanium and titanium‑based alloys for general industrial parts and structural applications. It defines permitted tube diameters and wall‑thickness ranges, length options (measured and non‑measured), classification by accuracy and quality groups, acceptance criteria, mechanical and chemical requirements for listed alloy grades, and rules for marking and documentation. (See replacement standard for current, updated scope and requirements.)

Key topics and requirements

• Assortment and dimensional ranges (outer diameters, wall thicknesses, measured/non‑measured lengths) and permitted dimensional deviations (accuracy grades A/B).
• Material grades covered (typical titanium alloys listed in the standard, e.g., VT1‑0, PT‑1M, PT‑7M, PT‑3V, VT14, OT4, OT4‑1, AT3, TS5) and limits for hydrogen and other interstitials where specified.
• Required thermal treatment regimes (including vacuum heat treatment for specified cases), mechanical properties tables (tensile strength, yield, elongation, reduction of area, impact energy).
• Manufacturing classifications: supply groups (A — higher quality; B — ordinary quality), tolerances by group and quality category.
• Inspection, acceptance testing and marking — dimensional checks, non‑destructive and destructive testing rules, and documentation required for delivery.

Typical use and users

Primary users include titanium‑tube manufacturers, metal stockists and distributors, procurement and quality engineers in aerospace, chemical processing, power generation, shipbuilding, and industrial equipment manufacturers where corrosion resistance, high strength-to-weight and temperature performance of titanium alloys are required. Technical libraries, standards administrators and certification bodies also reference the standard for legacy products and procurement of older stock.

Related standards

GOST 21945-76 references and is associated with multiple GOST documents for test methods, metallurgical and dimensional standards (examples: GOST 166, GOST 1497, GOST 2789, GOST 2991, GOST 3282, GOST 3560, GOST 3845, GOST 6507 among others). The topic is continued and updated in the replacement standard GOST 21945-2023, which expands and modernizes requirements.

Keywords

GOST 21945-76; titanium tubes; seamless hot‑rolled tubes; technical conditions; tube dimensions; titanium alloys; VT1‑0; PT‑7M; supply groups A/B; tube tolerances.

FAQ

Q: What is this standard?

A: GOST 21945-76 is a Soviet‑era interstate standard titled "Seamless hot‑rolled tubes from alloys based on titanium. Specifications" that set technical requirements for seamless hot‑worked titanium alloy tubes.

Q: What does it cover?

A: It covers tube sizes and assortment, permissible dimensional deviations, material grades and their chemical/mechanical requirements, heat treatment, inspection and acceptance rules, marking and delivery documentation for seamless hot‑rolled titanium tubes.

Q: Who typically uses it?

A: Manufacturers and vendors of titanium tubes, procurement and quality engineers in industries using titanium (aerospace, chemical, shipbuilding, power, industrial equipment), and standards/quality departments referencing legacy specifications.

Q: Is it current or superseded?

A: The 1976 standard has been replaced/superseded in the national/interstate catalogues — the current replacement is GOST 21945-2023 (effective December 1, 2023). For current compliance and up‑to‑date technical requirements, use GOST 21945-2023.

Q: Is it part of a series?

A: It belongs to the group of GOST/GOST‑R standards covering titanium and metallic tubes and is linked by cross‑references to testing and metallurgical GOSTs; the topic continues in the updated GOST 21945 series (21945-2023).

Q: What are the key keywords?

A: Titanium, seamless tube, hot‑rolled (hot‑worked), specifications, GOST 21945-76, titanium alloys, tube tolerances, supply groups A/B.