ISO 6506-1:2014

Overview

ISO 6506-1:2014 - Metallic materials - Brinell hardness test - Part 1: Test method defines the standardized procedure for performing the Brinell hardness test on metallic materials using both fixed-location and portable hardness testing machines. The standard describes the test principle, required apparatus (tungsten‑carbide ball indenter, force application system, optical measuring device), test conditions, recording and reporting rules, and guidance on uncertainty and routine checks.

Keywords: ISO 6506-1:2014, Brinell hardness test, HBW, metallic materials, hardness testing, indenter, test force.

Key technical topics and requirements

• Test principle: A polished tungsten‑carbide ball (diameter D) is pressed into the specimen with a force F; the mean indentation diameter d is measured and used to calculate Brinell hardness (HBW) from the indentation surface area.
• Apparatus and range: Machines must apply forces between 9.807 N and 29.42 kN; indenter and measurement systems are specified in ISO 6506-2.
• Test forces and designations: Standardized force/ball combinations and HBW designations are given (e.g., example designation 600HBW 1/30/20 explains hardness value, ball diameter, force in kgf and test duration).
• Indentation limits: The ideal indentation diameter should lie between 0.24 D and 0.60 D; if outside, report the d/D ratio.
• Specimen requirements: Surface must be smooth, clean and minimally altered; specimen thickness should be at least eight times the indentation depth (see Annex B for minimum thickness values).
• Test procedure: Ambient temperature normally 10 °C to 35 °C (users may adopt tighter control); time to reach full force and hold times are specified (nominal application time ~7 s, hold ~14 s).
• Measurement and results: Measure indentation diameters in two approximately perpendicular directions (or use validated automatic algorithms); report HBW rounded to three significant figures.
• Uncertainty & verification: Guidance on uncertainty assessment (Annex C) and daily/per‑use machine checks using calibrated reference blocks (Annex A). If needed, follow ISO 6506-2 for verification and ISO 6506-3 for reference-block calibration.

Practical applications and users

Who uses ISO 6506-1:

• Metallurgical and materials testing laboratories
• Quality control and inspection teams in steel, aluminum, cast iron, copper, and alloy manufacturing
• Aerospace, automotive, construction and heavy industry inspection units
• Portable field-testing technicians and maintenance engineers

Typical uses:

• Hardness specification and acceptance testing of production parts
• Material identification and batch verification
• Selection of heat‑treatment parameters and process control
• Correlation with mechanical properties when appropriate (note: conversions to other hardness scales or tensile strength must be justified and reported)

Related standards

• ISO 6506-2: Verification and calibration of Brinell testing machines
• ISO 6506-3: Calibration of reference blocks
• ISO 6506-4: Table of hardness values
• ISO 4498: Sintered metal materials - apparent hardness and microhardness

This standard is essential for consistent, reproducible Brinell hardness testing and for ensuring traceable results across laboratories and industrial users.