Overview
ISO 683-17:2023 - "Heat-treatable steels, alloy steels and free-cutting steels - Part 17: Ball and roller bearing steels" - specifies the technical delivery requirements for wrought steels used in ball and roller bearings. It covers five main groups of bearing steels: through‑hardening, case‑hardening, induction‑hardening (unalloyed and alloyed), stainless bearing steels, and high‑temperature bearing steels. The standard applies to the product and heat‑treatment conditions listed in its tables and defines applicable surface conditions.
Key topics and technical requirements
- Classification and designation: Steel grades are classified per ISO 4948 series and designated using ISO/TS 4949; Annex B gives cross‑references to other designation systems.
- Purchaser information: Mandatory order data includes quantity, product form (bars, rings, discs, wire, tubes, etc.), dimensional standard/tolerances, reference to ISO 683-17, steel grade (Table 3), heat‑treatment condition (Table 1) and inspection certificate type.
- Manufacturing and heat treatment: Requirements cover deoxidation, vacuum degassing, hydrogen removal and specified heat‑treatment/surface conditions at delivery.
- Chemical composition and alloying: The standard defines chemical composition limits for each steel group (note: through‑hardening steels are about 1% C and 1–2% Cr).
- Hardenability, hardness and microstructure: Hardenability verification (e.g., Jominy tests per ISO 642), hardness ranges, austenitic grain size, carbide distribution and decarburization depth are specified.
- Inclusions and surface quality: Microscopic and macroscopic non‑metallic inclusions, internal soundness, surface finish classes (Table 2) and dimensional tolerances are addressed.
- Inspection and test methods: Inspection document types, testing frequencies and methods are referenced (ISO 377, ISO 404, ISO 4967, ISO 6506/6508 etc.). Annex A lists supplementary or special purchaser requirements.
- Marking and traceability: Delivery marking and cast traceability requirements are included.
Practical applications and users
ISO 683-17 is used by:
- Steel producers and foundries to specify and certify bearing steel deliveries.
- Bearing manufacturers (rings and rolling elements) to select steels with required hardness, cleanliness and heat‑treatability.
- Quality and design engineers in automotive, aerospace, wind, rail and industrial machinery who specify bearing materials and acceptance tests.
- Procurement and inspection teams who prepare purchase orders and evaluate inspection certificates (ISO 10474).
Benefits include consistent material quality, reliable heat‑treatment guidance and clear acceptance criteria for bearing performance and longevity.
Related standards
ISO 683-17 references many standards for sampling, testing and classification, including:
Keywords: ISO 683-17, bearing steels, ball and roller bearing steels, through‑hardening, induction‑hardening, case‑hardening, stainless bearing steels, heat‑treatment, technical delivery requirements.
Open preview (PDF)Heat-treatable steels, alloy steels and free-cutting steels — Part 17: Ball and roller bearing steels
