GB/T 1979-2025 Active National standards

GB/T 1979-2025 Evaluation of macrostructural defects in structural steels—Acid etching method and ultrasonic testing method

Publish Date: 2025-08-29 Implement Date: 2026-03-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 1979-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Metallographic examination methods

ICS Name: Other testing methods for metal materials

Publish Date: 2025-08-29

Implement Date: 2026-03-01

Pages: 88 pages

Scope

This document describes the evaluation of low-magnification structural steel defects using acid immersion and ultrasonic testing methods, including the principle of acid immersion, defect classification, characteristics, causes, and evaluation principles; the classification and application scope of evaluation charts; and the principle of ultrasonic testing, instruments and equipment, comparison test pieces, testing conditions and steps, and result evaluation.
This document is applicable to the evaluation of low-magnification structural defects in carbon structural steel, alloy structural steel, and spring steel (forged and rolled billets). The evaluation of low-magnification defects in other steels shall be conducted in accordance with this document.

Development Information

Word Count: 150 Thousand words Pages: 88 pages

Replace the following standards

GB/T 1979-2001 Standard diagrams for macrostructure and defect of structural steels GB/T 7736-2008 Ultrasonic inspecting method for macro-structure and imperfection of steel

Referenced Standards

GB/T 226-1991 Etch test for macrostructure and defect of steels GB/T 226-2015 Test method for macrostructure and defect of steel by etching GB/T 9445-1999 Qualification and certification for nondestructive testing personnel GB/T 9445-2005 Non-destructive testing—Qualification and certification of personnel GB/T 9445-2008 Non-destructive testing—Qualification and certification of personnel GB/T 9445-2015 Non-destructive testing—Qualification and certification of NDT personnel GB/T 9445-2024 Non-destructive testing—Qualification and certification of personnels GB/T 23905-2009 Non-destructive testing—Blocks for ultrasonic testing GB/T 27664.2-2011 Non-destructive testing—Characterization and verification of ultrasonic test equipment—Part 2:Probes JJG 746-2004 Ultrasonic Flaw Detectors JJG 746-2024 Ultrasonic Flaw Detectors GB/T 27664.2-2026 Non-destructive testing instruments—Characterization and verification of ultrasonic test equipment—Part 2:Probes

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