ISO 5755:2022

Overview

ISO 5755:2022 - Sintered metal material - Specifications is the fourth edition (2022) of the international standard that defines requirements for sintered metal materials used in bearings and structural parts. The standard specifies acceptable chemical composition, and mechanical and physical properties, and it describes required test methods, sampling rules and designation systems for powder-metallurgy (PM) materials. It replaces ISO 5755:2012 and includes updated metallography guidance (Annex B) and equivalence tables with other standards (Annex C).

Key Topics

• Scope and purpose: Requirements for sintered metal materials intended for bearings and structural components (chemical, mechanical, physical).
• Sampling: Powder sampling procedures referenced to ISO 3954.
• Normative test methods:
  • Chemical analysis and carbon determination (ISO 7625 / ISO 437 references).
  • Open porosity determination per ISO 2738.
  • Tensile testing per ISO 2740 and ISO 6892-1 (ultimate tensile strength, yield strength).
  • Radial crushing strength for bushings per ISO 2739.
  • Other mechanical/physical tests: density, Young’s modulus, Poisson’s ratio, impact energy, compressive yield, transverse rupture, fatigue and apparent hardness (methods and informative guidance provided).
• Tables and specifications: Material tables (Tables 1–18) list composition limits and minimum / reference mechanical properties for as-sintered and heat-treated conditions.
• Designation system: Normative Annex A defines material designation nomenclature; Annex B shows typical microstructures; Annex C maps equivalences with other PM standards.
• Important note: PM properties depend on composition, density and production route - consultation with suppliers is recommended for application-specific selection.

Applications

ISO 5755:2022 is used to:

• Specify material requirements for sintered bearings and structural parts in automotive, industrial, and consumer applications.
• Guide design engineers, material specifiers, quality assurance teams, and procurement in selecting PM materials based on standardized property limits.
• Define acceptance testing and contract requirements between buyers and PM manufacturers.
• Support testing laboratories and manufacturers in applying consistent test methods and reporting (tensile, porosity, hardness, fatigue, etc.).
• Provide metallurgy and equivalence information for substitution and cross-referencing between international standards.

Related Standards (selected)

• ISO 3954 - Sampling of powders for PM
• ISO 2738 - Density, oil content and open porosity
• ISO 2739 - Radial crushing strength
• ISO 2740 / ISO 6892-1 - Tensile test methods
• ISO 3325 - Transverse rupture strength
• ISO 4498 / ISO 5754 - Hardness and impact tests

Keywords: ISO 5755:2022, sintered metal material, powder metallurgy, specifications, bearings, structural parts, chemical composition, tensile strength, open porosity, test methods.