GOST 8645-68 PDF

Full title and description

GOST 8645-68 — "Rectangular steel tubes. Range" (Russian: "Трубы стальные прямоугольные. Сортамент"). Interstate standard originally developed by the Ministry of Metallurgy of the USSR that defines the assortment (standard sizes, wall thicknesses, sectional properties and related requirements) for rectangular steel tubes manufactured as seamless hot‑rolled, cold‑drawn and electric‑welded products.

Abstract

This standard specifies the assortment (dimensional series) of rectangular steel tubes: overall dimensions (height and width), standard wall thicknesses, calculated sectional area and mass per metre, moments of inertia and resistance, permissible production types (hot‑rolled, cold‑drawn, electric‑welded), and associated basic requirements for marking and delivery. The original document was approved in 1968 and introduced into force on 1 January 1969; later amendments were integrated into the text.

General information

• Status: In force (standard with integrated amendments No.1–4; expiration removed by decision of the standards authority).
• Publication date: Approved 25 April 1968; introduced into force 1 January 1969.
• Publisher: Gosstandart of the USSR (original); published by Izdatelstvo standartov; current custodian/registry entry maintained by national standards bodies (Rosstandart / interstate standards organizations).
• ICS / categories: ICS 23.040 (Pipes and their components) — often referenced under subcategory 23.040.10; national group designation B62; OKP codes for assortment listings (historical manufacturing classification).
• Edition / version: Designation GOST 8645-68 (original 1968/1969). Edition with integrated Amendments No.1 (1984), No.2 (1986), No.3 (1991) and No.4 (adopted 2009 / implemented in Russian Federation 2010) is commonly used in practice.
• Number of pages: 19 (original published text).

Scope

Applies to steel rectangular tubes used in general‑purpose structural and industrial applications. Covers seamless hot‑rolled, cold‑drawn and electric‑welded manufacturing methods and establishes the standardized assortment (nominal external dimensions, standard wall thicknesses), tabulated mass per metre, sectional area and basic mechanical/sectional characteristics necessary for design, manufacture, procurement and stockkeeping. Does not itself specify detailed chemical composition or full mechanical properties (those are handled by material grades and related standards).

Key topics and requirements

• Standardized range of outside dimensions (height A and width B) and tabulated standard wall thicknesses (S) for rectangular tubes.
• Tabulated sectional area, mass per metre, moments of inertia and section modulus for each standard size.
• Applicability to three production types: seamless hot‑rolled, cold‑drawn, and electric‑welded tubes.
• Basic dimensional tolerances and permissible deviations for external sizes and wall thicknesses (as given in the tables and notes of the standard).
• Requirements for marking, labeling and packaging for delivery to consumers (minimum marking elements and bundle/packing rules).
• References to related normative documents for technical requirements, testing and steel grades (to be applied together with material‑specific GOSTs).
• Integrated amendments (No.1–4) that update assortment tables and administrative details — the edition in common use incorporates those changes.

Typical use and users

Used by steel producers and tube manufacturers to produce and mark rectangular tubes to a common assortment; by structural and mechanical designers and engineers for selection of profiles in building, machinery frames, transport and general fabrication; by procurement and inventory managers for ordering and cataloguing stock; and by testing/quality departments and certification bodies for conformity checks against dimensional and marking requirements.

Related standards

Standards commonly referenced together with GOST 8645-68 include earlier replaced edition GOST 8645-57 (superseded by 8645-68), standards on technical requirements for profile/steel tubes (for example GOST 13663 series), related GOSTs covering welded/seamless pipe production and testing, and various material‑grade GOSTs that specify chemistry and mechanical properties of steels used for tube manufacture. National/regional technical regulations (for example EAEU/TR or GOST‑R family standards) may also apply for specific uses or market access.

Keywords

GOST 8645-68, rectangular steel tubes, profile tube, tube assortment, dimensions, wall thickness, mass per metre, seamless, welded, hot‑rolled, cold‑drawn, Izdatelstvo standartov, Gosstandart.

FAQ

Q: What is this standard?

A: GOST 8645-68 is an interstate (Soviet origin) standard that defines the assortment (standard sizes and related sectional data) for rectangular steel tubes manufactured as seamless hot‑rolled, cold‑drawn or electric‑welded products.

Q: What does it cover?

A: It covers the nominal external dimensions (height and width), standard wall thicknesses, tabulated sectional area, mass per metre, moments of inertia and section moduli for each listed size, plus basic tolerances, marking and delivery/packaging conventions. Detailed material property requirements are handled by other material‑specific standards.

Q: Who typically uses it?

A: Tube and steel manufacturers, structural/mechanical designers and engineers, procurement and inventory staff in construction and manufacturing, quality/control laboratories, and certification bodies working with rectangular steel profiles.

Q: Is it current or superseded?

A: The standard GOST 8645-68 was introduced on 1 January 1969 and has received multiple amendments (No.1–4). Its formal expiration was removed by the standards authority (1991 decision) and it is commonly listed as "in force" with integrated amendments in national registries. Users should verify the currently required edition and any national technical regulations that may impose additional requirements for specific applications or markets.

Q: Is it part of a series?

A: Yes — it belongs to the family of pipe and profile standards (various GOSTs covering round, square and shaped pipes). It replaced the earlier GOST 8645-57 and is often used alongside related standards (for technical requirements, testing and steel grades) such as GOSTs addressing profile pipe technical requirements and material specifications.

Q: What are the key keywords?

A: Rectangular steel tube, assortment, dimensions, wall thickness, mass per metre, seamless, welded, hot‑rolled, cold‑drawn, GOST 8645-68, Изменения (amendments).