STO ASCHM 20-93 PDF

Full title and description

STO ASCHM 20-93 — "Прокат стальной сортовой фасонного профиля. Двутавры горячекатаные с параллельными гранями полок. Технические условия" (Rolled steel sections — hot‑rolled I‑beams with parallel flange faces; specification).

Abstract

Organizational technical specification that defines types, main dimensions, tolerances, classification and basic acceptance / testing requirements for hot‑rolled I‑beams (parallel‑flange sections) made of unalloyed and low‑alloy steels. It is used by producers and traders of rolled sections and by designers when selecting Russian‑format I‑beam profiles.

General information

• Status: Active / in commercial use (applied by producers and suppliers of rolled sections).
• Publication date: 1993 (designation suffix "-93"); introduced into effect from 1 January 1994.
• Publisher: Issued as a СТО (standard of organization) by ASChM — the industry association commonly cited as "Ассоциация Черметстандарт / ASChM" (organizational/industry technical specification).
• ICS / categories: Metallurgy — steel profiles and sections (ICS class for steel profiles / sections: 77.140.70).
• Edition / version: Original issue: STO ASChM 20‑93 (1993). No later consolidated edition widely published under the same designation was identified in public supplier/registry listings.
• Number of pages: ~17 pages in the published technical specification (document scans/listings indicate 17 pages).

Scope

Specifies technical requirements for hot‑rolled I‑beams (двутавры) with parallel flange faces produced from carbon and low‑alloy steels: dimensional assortment (profile types and sizes), mass per metre, manufacturing accuracy classes, basic mechanical and chemical acceptance criteria, surface and marking rules, and required acceptance and test methods for supplied batches. The document is intended for manufacturers, purchasers and users of shaped rolled steel sections in building and engineering applications.

Key topics and requirements

• Assortment and profile classification — profile series and types (examples: B (normal), Ш (wide‑flange), K (column) and variant index numbers indicating height/weight classes).
• Dimensional tables and nominal sectional parameters — height, flange width, web and flange thickness, radius of junction and nominal mass per metre for each profile.
• Tolerances and accuracy classes — permitted geometric and mass deviations for different accuracy classes and manufacturing methods.
• Materials and steel grades — applicable carbon and low‑alloy structural steels (marks used in practice include Ст3, С245, 09Г2С, С255, С345 etc. as noted in producer listings).
• Acceptance, testing and marking — rules for batch acceptance, mechanical and chemical testing, sampling methods and marking/packaging requirements.
• Compatibility with GOST norms — used alongside or compared to related GOST documents governing rolled sections and test methods.

Typical use and users

Used by steel mills and rolling plants, metal traders and distributors, structural engineers and fabricators specifying Russian‑format rolled sections for buildings, bridges, columns, crane runways, and other load‑bearing steel structures. Suppliers commonly reference STO ASChM 20‑93 when selling hot‑rolled I‑beams in the CIS and neighbouring markets.

Related standards

Often used in conjunction with national GOST standards for rolled metal and test methods — commonly referenced documents include GOST 8239‑89 (hot‑rolled I‑beams), GOST 26020‑83 and later national standards for beam assortments (examples: ГОСТ Р 57837‑2017 in some product listings). International parallels include EN/ISO standards for I/H sections.

Keywords

СТО АСЧМ 20‑93; STO ASChM 20‑93; I‑beam; hot‑rolled I sections; parallel flange faces; rolled steel sections; двутавр; профиль; beam assortment; mass per metre; tolerances.

FAQ

Q: What is this standard?

A: STO ASChM 20‑93 is an organizational technical specification (СТО) that sets technical conditions for hot‑rolled I‑beams with parallel flange faces — defining sizes, tolerances, acceptance tests and related production/marking rules used by producers and suppliers.

Q: What does it cover?

A: It covers the assortment of profiles (types and size series), dimensional and mass tables, manufacturing accuracy classes, permitted deviations, material/steel grade categories used, and acceptance/testing/marking procedures for rolled I‑beams.

Q: Who typically uses it?

A: Steel mills, rolling‑mill production planners, metal distributors, structural engineers and fabricators working with Russian/CIS rolled profiles and purchasing hot‑rolled I‑beams for construction and industrial structures.

Q: Is it current or superseded?

A: The document STO ASChM 20‑93 (issued 1993, entered into effect Jan 1, 1994) continues to appear in supplier and product specifications; it is an organizational standard (СТО) rather than a national GOST, and users commonly apply it alongside or in place of older GOST references. For specific regulatory or design work, check whether a later national standard (for example GOST R designations) is required by the governing project or purchaser.

Q: Is it part of a series?

A: It is one STO in the ASChM series of organization standards covering various rolled products; beams produced to STO ASChM 20‑93 are referenced together with other STO/GOST documents in product assortments and mill catalogs. Related organizational and national documents include other ASChM STOs and GOST standards covering rolled shapes and test methods.

Q: What are the key keywords?

A: I‑beam, двутавр, hot‑rolled, parallel flange faces, rolled steel sections, STO ASChM 20‑93, beam assortment, mass per metre, tolerances, acceptance tests.