ISO 4384-1:2019

Overview

ISO 4384-1:2019 is an international standard developed by the International Organization for Standardization (ISO) that specifies the parameters for hardness testing of compound materials used in plain bearings. This part of the ISO 4384 series focuses specifically on multilayer bearing materials composed of steel combined with bearing metals based on copper and aluminium. Applicable to materials manufactured by casting, sintering, or bonding, this document supplements existing ISO hardness testing standards by providing extensions and restrictions relevant to multilayer bearings. The hardness testing method applied varies depending on factors such as the bearing metal layer thickness, hardness, and microstructure.

Key Topics

• Multilayer Bearing Materials: Covers compound materials combining steel backings with copper- or aluminium-based bearing metals.
• Hardness Testing Parameters: Specifies test conditions tailored to the thickness and structure of bearing metal layers.
• Specimen Preparation: Requires test specimen surfaces to be bright metallic, plane, and heat-free to ensure reliable indentation measurements.
• Testing Methods: Uses Brinell hardness testing with varied ball diameters, test forces, and durations depending on layer thickness:
  • Small load hardness testing for very thin layers (≤0.2 mm)
  • Standard Brinell hardness testing (HBW) for thicker layers, with load sizes adapted to thickness ranges
• Test Reporting: Mandates detailed documentation including reference to ISO 4384-1:2019, specimen details, test conditions, results, and any deviations or observations affecting outcomes.

Applications

ISO 4384-1:2019 plays a critical role in quality control and material characterization within industries utilizing plain bearings with multilayer compound materials. Key applications include:

• Bearing Manufacturing: Ensuring the integrity and performance of multilayer bearings for automotive, aerospace, industrial machinery, and heavy equipment sectors.
• Material Certification: Verifying hardness properties to meet specifications for copper and aluminium-based bearing metals bonded to steel.
• Research and Development: Assisting in the development of new bearing materials and manufacturing processes by providing reproducible hardness measurement parameters.
• Failure Analysis: Providing standardized hardness data which helps assess wear, structural integrity, and longevity of plain bearings in service.

Related Standards

ISO 4384-1:2019 complements other standards relevant to hardness testing and plain bearing materials, including:

• ISO 6506-1: Metallic materials - Brinell hardness test - Part 1: Test method. This standard provides the fundamental Brinell hardness testing procedure referenced and supplemented by ISO 4384-1.
• Other parts of the ISO 4384 series which cover different types of bearing materials and hardness testing methods.
• Standards related to metallurgical testing, specimen preparation, and mechanical property characterization.

By adhering to ISO 4384-1:2019, organizations benefit from consistent, reliable hardness testing protocols tailored for advanced multilayer bearing materials, supporting product quality and performance excellence.