GOST 21397-81 PDF

Full title and description

GOST 21397-81 — Non-destructive testing. Set of standard samples for ultrasonic testing of semi-finished products and items made of aluminium alloys. Technical conditions. The standard specifies construction, basic parameters, marking, packing and metrological requirements for a kit of standard ultrasonic reference samples intended for setting conditional sensitivity and determining equivalent defect sizes when inspecting aluminium-alloy products with pulse-echo ultrasonic defectoscopes.

Abstract

This standard defines a complete kit of standard samples (KSO) for ultrasonic testing of aluminium alloys: geometric dimensions, artificial flat-bottom reflectors, color coding and marking, material and acoustic properties, acceptance tolerances, packaging, storage and service life. It is intended to provide reproducible reference echo-signals for calibration, adjustment and verification of general-purpose pulse-echo ultrasonic testing instruments working with direct and separate/composite transducers.

General information

• Status: Withdrawn (document lost force on 1 January 1993; previously introduced and amended during USSR era).
• Publication date: Entered into force 1 January 1983 (approved by Gosstandart USSR 18 November 1981; amended 1987; reprinted editions exist).
• Publisher: Gosstandart of the USSR / Издательство стандартов (Publishing House of Standards), Moscow (original national standard of the USSR).
• ICS / categories: 19.100 — Non-destructive testing; (also relevant to testing of metals / NDT of metallic products).
• Edition / version: Designation year 1981 (–81); entered into force 1983; contains Amendment No.1 (June 1987) and later reprints.
• Number of pages: Short national standard (about 5 pages in the standard text/reprint summaries).

Scope

Applies to a kit of standard samples intended for (1) setting the conditional sensitivity of ultrasonic defectoscopes and (2) determining equivalent defect sizes when performing ultrasonic inspection of semi-finished products and finished items made from aluminium alloys. The kit is intended for use with general-purpose pulse-echo ultrasonic instruments and both contact and immersion techniques as specified. The standard specifies which sample diameters, depths and marking/colors are used, and gives packaging and handling requirements.

Key topics and requirements

• Definition of a complete kit (KSO) composition: sets of cylindrical samples with flat‑bottom reflectors of specified diameters and depths, and protective cases/packaging.
• Geometric tolerances for sample diameters, depths to flat‑bottom reflectors, parallelism and flatness limits and permitted deviations.
• Materials: samples manufactured from specified aluminium alloy (examples in the text: alloy D16/Д16T or equivalent) with required acoustic properties (ultrasound velocity, noise level limits).
• Acoustic performance: amplitude uniformity requirements for echo signals from identical reflectors (maximum allowed dB variation) and noise-to-signal ratio criteria for the material.
• Marking and color coding by reflector diameter, sample identification and traceability; provision of passport, technical description and operating instructions with each kit.
• Packaging, transport and storage specifications including case design, additional packing materials and gross mass limits for shipment.
• Service life and reliability requirements (stipulated minimum operating hours and guaranteed service life in the standard and its amendment).

Typical use and users

Used by non-destructive testing (NDT) laboratories, inspection and quality departments of aluminium-product manufacturers, calibration/verification centers, metrology services and maintenance/repair facilities that perform ultrasonic flaw detection and sizing on aluminium alloy parts. Typical applications include calibration of defectoscopes, operator training, routine verification of instrument sensitivity and preparation of reference signals for inspection procedures.

Related standards

References and normative links in the standard include other GOSTs for aluminium alloys and testing procedures (for example standards on alloy designation and properties, packaging and transport, and measurement tools). The standard cites GOSTs such as those covering aluminium alloy materials and packaging practices; it also sits among national and later interstate/National (GOST R / ISO-adopted) documents on ultrasonic testing and NDT methods. For broader context see international ultrasonic and NDT standards under ICS 19.100.

Keywords

GOST 21397-81, ultrasonic testing, non-destructive testing, standard samples, reference samples, aluminium alloys, flat‑bottom reflector, calibration, defectoscope, KSO (kit of standard samples), Gosstandart.

FAQ

Q: What is this standard?

A: GOST 21397-81 is a Soviet-era national standard that specifies a kit of standard ultrasonic reference samples (for aluminium-alloy semi-finished products and items) including their dimensions, marking, material and metrological requirements.

Q: What does it cover?

A: It covers the composition and basic parameters of the reference-sample kit used to set conditional sensitivity and to determine equivalent defect sizes in ultrasonic inspection of aluminium-alloy products (sample sizes, reflector diameters and depths, acoustic performance, marking, packing and service life).

Q: Who typically uses it?

A: NDT technicians and engineers, inspection labs, manufacturers of aluminium products, calibration and metrology centers, and any organization performing ultrasonic calibration and verification on aluminium alloys.

Q: Is it current or superseded?

A: The standard was introduced in the early 1980s (entered into force 1 January 1983) and, according to national records, the document lost force on 1 January 1993. Users should verify current applicable documents and any newer interstate or national replacements (GOST R / ISO-adopted standards) before relying on it for regulatory compliance.

Q: Is it part of a series?

A: It is part of the body of GOST documents dealing with non-destructive testing and reference samples; normative references within the text point to related GOSTs for materials, measurement tools and packaging. It sits within the broader NDT standardization area (ICS 19.100).

Q: What are the key keywords?

A: Ultrasonic reference samples, flat-bottom reflector, aluminium alloy samples, calibration kit, non-destructive testing, defectoscope, GOST 21397-81.