GOST 12348-78 PDF

Full title and description

GOST 12348-78 — "Alloyed and high-alloyed steels. Methods for determination of manganese" (ГОСТ 12348−78). This interstate standard specifies chemical-analytical procedures (photometric, titrimetric (arsenite‑nitrite), potentiometric and atomic‑absorption) and associated sampling/preparation and calculation rules for measuring the mass fraction of manganese in alloyed and high‑alloyed steels.

Abstract

GOST 12348-78 defines laboratory methods to determine manganese content in alloyed and high‑alloyed steels across a wide concentration range: photometric (approx. 0.005–10.0 % Mn), titrimetric (arsenite‑nitrite, approx. 0.30–10.0 % Mn), potentiometric (approx. 4.0–40.0 % Mn) and atomic absorption (approx. 0.01–5.0 % Mn). The standard includes requirements for sample dissolution, calibration, calculation of mass fraction and limits on permissible discrepancies between parallel determinations.

General information

• Status: Interstate / national standard (established under the former USSR system) — listed in modern standards catalogs as the 1978/1980 GOST for manganese determination (available with amendments).
• Publication date: Established by resolution 23 November 1978; date of introduction 1 January 1980.
• Publisher: Approved by the State Committee for Standards (Gosstandart) / Interstate Council for Standardization (interstate standard, USSR/EASC family).
• ICS / categories: Metallurgy / steels — ICS 77.080.20 (metallurgical analysis / steels).
• Edition / version: Original designation GOST 12348‑78 (replacing GOST 12348‑66); published with Amendments (No. 1 — 1980, No. 2 — 1984, No. 3 — 1989) and later printed/issued copies available.
• Number of pages: Typically published as a short methods standard — 12 pages in common commercial copies.

Scope

This standard applies to chemical analysis of alloyed and high‑alloyed steels to determine the mass fraction of manganese for quality control, inspection and certification purposes. It covers recommended sample masses and dissolution procedures, four analytical techniques (photometric, titrimetric (arsenite‑nitrite), potentiometric and atomic absorption), calibration‑curve construction, calculation formulae for mass fraction and acceptance criteria for repeatability of parallel results within specified concentration ranges.

Key topics and requirements

• Specified analytical methods and their applicable concentration ranges: photometric (≈0.005–10.0 % Mn), titrimetric arsenite‑nitrite (≈0.30–10.0 % Mn), potentiometric (≈4.0–40.0 % Mn), atomic absorption (≈0.01–5.0 % Mn).
• Detailed sample dissolution procedures (acid mixtures, oxidation steps, evaporation when necessary) and recommended sample masses by expected Mn content.
• Calibration curve construction and preparation of standard solutions for each technique (explicit instructions for optical lines, standard volumes and concentrations for photometry and atomic absorption).
• Formulas for calculating mass fraction of manganese from measured quantities (optical density, titration volumes, instrument readings) and required units.
• Permissible absolute discrepancies (repeatability limits) between the outermost of three parallel determinations at a 0.95 confidence level given by concentration intervals (tables of allowable differences).
• Requirements for reagent quality, reference standards and preparation of calibration (blank) and control solutions.
• Compatibility/alignment with ST SEV 486‑88 and ISO 629‑82 (standard states conformity with the ISO document).

Typical use and users

Primary users are metallurgical and chemical laboratories, steel manufacturers and heat‑treatment shops, quality control and inspection bodies, research laboratories and certification bodies that need standardized procedures to measure manganese in alloy and high‑alloy steels for product specification verification, incoming/outgoing inspection and materials development. Laboratories use the standard to choose the appropriate analytical method by expected Mn range and to demonstrate repeatable results in line with national/interstate practice.

Related standards

GOST 12348‑78 replaces GOST 12348‑66 (earlier edition) and is declared compatible with ISO 629‑82 (steel — determination of manganese). Related GOST documents in the same product/analysis family include other metallurgy and chemical‑analysis standards (adjacent GOSTs for steel chemical analysis and materials specifications). Consult national collections/catalogs for the precise list of cross‑references and normative documents cited in clause references.

Keywords

GOST 12348‑78; manganese determination; alloyed steels; high‑alloyed steels; photometric method; titrimetric arsenite‑nitrite; potentiometric method; atomic absorption; calibration; metallurgical analysis; Gosstandart; ISO 629.

FAQ

Q: What is this standard?

A: GOST 12348‑78 is an interstate standard that sets laboratory methods and procedural requirements for determining the mass fraction of manganese in alloyed and high‑alloyed steels.

Q: What does it cover?

A: It covers sample sizing and dissolution, four analytical techniques (photometric, titrimetric arsenite‑nitrite, potentiometric and atomic absorption), calibration procedures, calculation formulae and allowable repeatability limits for parallel determinations across specified Mn concentration ranges.

Q: Who typically uses it?

A: Metallurgical and materials testing laboratories, steel producers and their QA/QC departments, certification bodies and researchers performing chemical analysis of steel.

Q: Is it current or superseded?

A: The 1978/1980 edition (GOST 12348‑78) is commonly listed in standards catalogs and commercial repositories with its amendments (1980, 1984, 1989). Users should verify national/regional applicability and whether a more recent national or EAEU technical regulation applies in their jurisdiction; for legal or regulatory compliance confirm status with the relevant national standards body or an authorized standards catalog.

Q: Is it part of a series?

A: Yes — it belongs to the family of GOST standards on alloy and high‑alloy steels and steel chemical analysis; the document references and is aligned with related GOSTs and ISO 629‑82. It formally replaced an earlier GOST 12348‑66 edition.

Q: What are the key keywords?

A: Manganese determination, alloyed steels, high‑alloy steels, photometric analysis, titration (arsenite‑nitrite), potentiometry, atomic absorption, calibration, analytical chemistry of metals.