GOST 1778-2022 PDF

Full title and description

GOST 1778-2022 — "Металлопродукция из сталей и сплавов. Металлографические методы определения неметаллических включений" / "Steel and alloy metal products. Metallographic methods for the determination of nonmetallic inclusions". The standard establishes metallographic test methods, classification rules and procedures for evaluating nonmetallic inclusions in steels and ferrous alloys used for product control, acceptance testing and research.

Abstract

This national standard (GOST 1778-2022) updates and replaces the previous edition (GOST 1778-70) and defines accepted metallographic procedures for detecting, classifying and quantifying nonmetallic inclusions in steel and alloy products. It covers sample preparation, microscopic examination, comparison with reference scales, counting and volumetric/linear assessment methods and reporting formats for inclusion content and classes.

General information

• Status: Active (national standard in force).
• Publication date: 01 June 2023.
• Publisher: Approved by Rosstandart (Federal Agency on Technical Regulation and Metrology); commonly distributed / published in print and electronic form by standard publishers (Standartinform and other distributors).
• ICS / categories: Metallurgy — ferrous metals / steels (classifier: 77.080.20).
• Edition / version: Edition 2022 (first issue of the 2022 designation; implements editorial changes and later corrigenda).
• Number of pages: 50.

Scope

GOST 1778-2022 applies to steels and ferrous alloys and specifies metallographic methods for determination of nonmetallic inclusions used in routine product control, acceptance testing and research. It replaces the earlier GOST 1778-70 and integrates updated procedures, scales and normative references applicable to modern steelmaking and testing practice.

Key topics and requirements

• Definitions and classification of nonmetallic inclusions (grouping by type, morphology and size).
• Sampling requirements and preparation of metallographic sections (polishing, etching and mounting) suitable for inclusion assessment.
• Microscopic examination procedures including recommended magnifications and use of reference comparison scales.
• Established methods for assessment: comparison with reference scales (Sh methods), counting methods (To), volumetric/percentage methods (P), and the linear counting method (L) with their variants and application guidance.
• Rules for calculating contamination parameters (number, size distributions, area/volume fraction or linear counts) and for reporting results in certificates and technical documentation.
• Normative references and cross-references to related metallurgical and standardization documents; provisions for corrigenda/updates noted in the text.

Typical use and users

This standard is used by metallurgical laboratories, quality control and inspection departments of steelworks, heat-treatment and forging shops, materials testing laboratories, product designers and suppliers who need repeatable metallographic assessment of inclusion content for acceptance, certification or failure analysis of steel and alloy products.

Related standards

GOST 1778-2022 is directly related to and replaces GOST 1778-70; it also references other sector standards and normative documents for sampling, microsection preparation and measurement methods (examples include related GOSTs for metal product testing and international references historically used in previous editions).

Keywords

metallography; nonmetallic inclusions; steel; inclusion classification; inclusion content; microscopic methods; Sh method; P method; L method; To method; quality control.

FAQ

Q: What is this standard?

A: A Russian national standard that specifies metallographic methods for the determination and classification of nonmetallic inclusions in steels and ferrous alloys (GOST 1778-2022).

Q: What does it cover?

A: Procedures for sampling and preparing metallographic sections, microscopic examination, use of reference scales, counting and volumetric/linear assessment methods, calculation and reporting of inclusion content and classes.

Q: Who typically uses it?

A: Metallurgical and materials testing laboratories, steel producers, quality/inspection engineers, product manufacturers and researchers concerned with inclusion-related properties and acceptance criteria.

Q: Is it current or superseded?

A: It is the current national standard (entered into force in 2023) and supersedes GOST 1778-70.

Q: Is it part of a series?

A: It belongs to the body of metallurgy and materials standards (ICS class 77 — metallurgy; ferrous metals and steels) and is used alongside other GOSTs that regulate sampling, testing and acceptance criteria for metal products.

Q: What are the key keywords?

A: Metallography, nonmetallic inclusions, inclusion classification, steel testing, microscopic methods, Sh/To/P/L methods.