ISO 1024-1989 PDF

Full title and description

ISO 1024:1989 — Metallic materials — Hardness test — Rockwell superficial test (scales 15N, 30N, 45N, 15T, 30T and 45T). This International Standard specifies the Rockwell superficial hardness test method intended for shallower impressions and lower test forces used on thin, case‑hardened or surface‑treated metallic materials.

Abstract

ISO 1024:1989 defines test procedure, designation and basic reporting conventions for the Rockwell superficial hardness scales N and T (15, 30 and 45 total test‑force variants). It covers required test equipment characteristics, indenters and test loads appropriate for superficial testing of metallic materials and gives guidance on application and interpretation of results. The standard was published in October 1989 and has since been withdrawn and superseded by later Rockwell hardness publications.

General information

• Status: Withdrawn / Withdrawn and superseded.
• Publication date: October 1989 (Edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.040.10 — Mechanical testing of metals.
• Edition / version: Edition 1 (1989).
• Number of pages: 6 pages.

Scope

Specifies the Rockwell superficial hardness test method for metallic materials using the N and T superficial scales (15N, 30N, 45N and 15T, 30T, 45T). The scope includes the test principle, description of the appropriate indenters (spheroconical diamond for N scales; small ball indenters for T scales), the minor (preliminary) and major test forces for superficial testing, test-piece and surface preparation considerations, and reporting of results. Note: ISO 1024:1989 has been withdrawn and its technical content was incorporated into and replaced by later editions of the ISO Rockwell hardness standards.

Key topics and requirements

• Definition and designation of the superficial Rockwell scales: 15N, 30N, 45N (diamond spheroconical indenter) and 15T, 30T, 45T (1/16‑in ball indenter).
• Typical loads: preliminary/minor load 3 kgf (≈29.42 N) and total/major loads of 15, 30 or 45 kgf (≈147.1 N, 294.2 N, 441.3 N) for the listed superficial scales.
• Equipment and indenter specifications (Brale/dia­mond spheroconical for N; small hardened or hardmetal ball for T), machine calibration and verification using test blocks.
• Test procedure essentials: application of minor load, application of additional load to reach total force, dwell times, removal sequence and measurement of permanent indentation depth to obtain hardness value.
• Reporting conventions for superficial scales (hardness number with scale designation, e.g., HR15N, HR30T) and guidance on material/thickness limitations for superficial testing.

Typical use and users

Used by materials testing laboratories, quality control/metallurgical engineers, heat‑treatment facilities and manufacturers of thin or case‑hardened components where conventional Rockwell loads would produce too deep an impression. Typical applications include sheet metal, thin‑gauge parts, coated or surface‑hardened components and materials requiring shallower indentation for accurate surface hardness measurement.

Related standards

ISO 1024:1989 was part of the family of Rockwell hardness standards and replaced earlier ISO 2712:1973 (copper and copper alloys — superficial scales). Its technical content was later incorporated into ISO 6508‑1 series (Rockwell hardness test — test method), with ISO 6508‑1:1999 (and subsequent revisions) providing the consolidated method for Rockwell and superficial scales. Other related documents include national/adopted standards and regional standards (for example DIN and ASTM E18 methods for Rockwell testing).

Keywords

Rockwell superficial, hardness test, ISO 1024:1989, HR15N, HR30N, HR45N, HR15T, HR30T, HR45T, Brale indenter, superficial Rockwell scales, metallic materials, test method, withdrawn, superseded.

FAQ

Q: What is this standard?

A: ISO 1024:1989 is an International Standard that specified the Rockwell superficial hardness test method for certain superficial scales (15N, 30N, 45N and 15T, 30T, 45T) used on metallic materials.

Q: What does it cover?

A: It covers the test principle, equipment and indenter types, specified minor and major loads for superficial scales, basic test procedure (minor load, application of additional load, dwell times and measurement), and reporting of results for superficial Rockwell hardness testing.

Q: Who typically uses it?

A: Materials testing laboratories, metallurgists, heat‑treatment and quality control personnel, and manufacturers testing thin, surface‑hardened or coated metallic components.

Q: Is it current or superseded?

A: ISO 1024:1989 has been withdrawn; its content was superseded and incorporated into later ISO Rockwell hardness standards (notably parts of the ISO 6508 series). The standard was withdrawn in the late 1990s and users should refer to the current ISO 6508 series (and later revisions) or appropriate national standards for up‑to‑date test methods.

Q: Is it part of a series?

A: Yes — ISO Rockwell hardness methods are published as a family/series (for example ISO 6508 parts) covering different scales and methods; ISO 1024:1989 related specifically to the superficial Rockwell scales within that family.

Q: What are the key keywords?

A: Rockwell superficial, HR15N, HR30N, HR45N, HR15T, HR30T, HR45T, Brale indenter, superficial hardness, ISO 6508, hardness testing, metallic materials.