ASTM A534-17 (2022) PDF

Full title and description

ASTM A534-17(2022) — Standard Specification for Carburizing Steels for Anti‑Friction Bearings. Defines chemical, metallurgical, and microstructural requirements, permitted forms, and optional supplementary requirements for steels intended for carburizing and use in manufacture of anti‑friction bearings (bars, forgings, and tubes supplied for bearing manufacture).

Abstract

This specification sets requirements for carburizing (case‑hardening) bearing‑quality steels. It covers allowed chemical compositions, inclusion ratings, grain size and hardenability criteria, permissible decarburization and surface condition limits, and required tests and inspection methods for material supplied for anti‑friction bearing applications. Optional supplementary requirements are provided to be invoked by purchase order where needed.

General information

• Status: Active (current/specification reapproved/updated).
• Publication date: Original issue 2017; reapproved/edited 2022 (designation shown as A534-17(2022)).
• Publisher: ASTM International.
• ICS / categories: 77.140.10 (Heat‑treatable steels / bearing steels).
• Edition / version: A534‑17, reapproved 2022 (commonly cited as A534‑17(2022)).
• Number of pages: 5 (concise specification document).

Scope

This standard applies to carburizing steels intended specifically for anti‑friction (rolling element) bearings. It prescribes the chemical composition ranges, microstructural and inclusion cleanliness requirements, allowable decarburization and surface imperfections, hardenability and grain‑size provisions, and the tests/acceptance criteria used to verify conformance. The specification is intended for material supplied in typical product forms used by bearing manufacturers (hot‑rolled, cold‑finished bars, forgings, and seamless tubes) and includes optional supplementary requirements that may be specified in orders.

Key topics and requirements

• Chemical composition limits for carbon, manganese, phosphorus, sulfur and common alloying elements used in carburizing grades (Cr, Ni, Mo, Cu, etc.).
• Designation and typical carburizing grades (examples: 4118H, 4320H, 4620H, 4720H, 4817H, 4820H, 5120H, 8617H, 8620H, 9310H and equivalents).
• Inclusion cleanliness ratings and acceptance criteria (thin and heavy series where applicable).
• Grain‑size and hardenability requirements to ensure suitable core properties after carburizing and heat treatment.
• Decarburization and surface imperfection limits and the microscopic methods for measuring them.
• Mechanical property verification after specified heat treatment (hardness, case/core characteristics where applicable).
• Specified test methods: chemical analysis, metallographic examination, hardness testing, and other inspections described in the standard.
• Optional supplementary requirements that purchasers may invoke for tighter controls, testing, marking or certification.

Typical use and users

Primary users are rolling‑element bearing manufacturers, steel producers and mills supplying bearing‑quality bars/tubes/forgings, heat‑treat shops, metallurgical engineers, quality/control inspectors, and procurement/specification writers in automotive, industrial machinery, aerospace component suppliers and other sectors requiring carburized bearing steels.

Related standards

Commonly referenced or complementary standards include other ASTM bearing‑steel specifications (for example standards addressing high‑carbon bearing steels, high‑hardenability grades, stainless bearing steels, and medium‑carbon bearing steels), and international documents for bearing steels such as ISO 683‑17. Standards for test methods and heat‑treatment practices are also commonly cross‑referenced in procurement and quality plans.

Keywords

carburizing steels, bearing steel, anti‑friction bearings, A534, A534‑17, A534‑17(2022), carburized grades, hardenability, decarburization, inclusion rating, grain size, bearing bars, bearing tubes, heat treatment.

FAQ

Q: What is this standard?

A: ASTM A534‑17(2022) is the ASTM International specification that defines requirements for carburizing (case‑hardening) steels used to manufacture anti‑friction (rolling‑element) bearings.

Q: What does it cover?

A: It covers chemical composition ranges, inclusion and grain‑size requirements, hardenability and mechanical property considerations, permissible decarburization and surface condition limits, test and inspection requirements, and optional supplementary requirements for steels supplied as bars, tubes and forgings for bearing manufacture.

Q: Who typically uses it?

A: Bearing manufacturers, steel mills and suppliers of bearing‑quality stock, heat‑treaters, metallurgists, QA/QC teams, and procurement/specification authors in industries that produce or use rolling‑element bearings.

Q: Is it current or superseded?

A: The document is current and shown as A534‑17 with a 2022 reapproval/confirmation. Users should confirm the latest status through ASTM International or their organization's standards subscription before placing orders or performing compliance checks.

Q: Is it part of a series?

A: It forms part of ASTM's suite of bearing‑steel specifications and is commonly used alongside other ASTM bearing‑steel standards and international standards for bearing steels and heat‑treatment/test methods.

Q: What are the key keywords?

A: Carburizing steels, bearing steel, anti‑friction bearing, A534, carburized grades (e.g., 8620H, 5120H, 9310H), hardenability, decarburization, inclusion rating.