ASTM E10 Standard Test Method for Brinell Hardness of Metallic Materials

The standard "ASTM E10 Standard Test Method for Brinell Hardness of Metallic Materials," developed by the American Society for Testing and Materials (ASTM), describes a test method for determining the Brinell hardness of metallic materials based on the Brinell indentation hardness principle. This standard provides requirements for the Brinell testing machine and procedures for performing Brinell hardness tests.

This test method includes requirements for the use of portable Brinell hardness testing machines that measure Brinell hardness according to the Brinell hardness test principle and are capable of meeting the requirements of this test method, including direct and indirect verifications of the testing machine. Portable Brinell hardness testing machines that cannot meet the direct verification requirements and can only be verified through indirect verification requirements are addressed in ASTM E110.

This standard also includes the following additional requirements:

Validation of Brinell hardness testing machines (Annex A1)
Brinell hardness standardization machines (Appendix A2)
Standardization of Brinell hardness indentations (Appendix A3)
Standardization of Brinell hardness test blocks (Appendix A4)

This standard also includes the following non-mandatory information regarding the Brinell hardness test:

Brinell hardness numbers table (Appendix X1)
Examples of procedures for determining Brinell hardness uncertainty (Appendix X2)

The Brinell hardness test is an indentation hardness test that can provide useful information about metallic materials. This information can be related to the tensile strength, wear resistance, ductility, or other physical properties of metallic materials and can be useful in quality control and material selection. Brinell hardness tests are considered satisfactory for acceptance testing of commercial shipments and have been widely used in industry for this purpose. However, a Brinell hardness test performed on a specific location on a part may not be representative of the physical properties of the entire part or the final product.

This standard outlines the procedure for determining the Brinell hardness number of metals and alloys. The Brinell test is particularly useful for testing materials with rough textures or irregular surfaces, such as castings and forgings.

During testing, a hardened steel or tungsten carbide ball (usually 10 mm in diameter) is pressed against the surface of the material under a specified load (e.g., 500 kgf, 1500 kgf, or 3000 kgf). The diameter of the indentation left in the surface is then measured. The Brinell hardness number is calculated using the load and the surface area of the indentation.

Common applications of this test include:

Quality control in foundries and metalworking industries
Characterization of mechanical properties of metals
Comparative material testing

The ASTM E10 standard is deemed necessary for the following important reasons:

Consistency and reproducibility: Defines a uniform procedure for conducting Brinell hardness tests. This ensures consistent results across different laboratories, operators, and equipment, which is critical for quality assurance and material comparison.
Material qualification: Used to verify that metals meet the hardness requirements specified in design standards, material specifications, or purchase orders. It is common in industries such as automotive, aerospace, construction, and metallurgy.
Quality control: Helps manufacturers monitor production quality by providing a reliable method for checking material hardness. It detects issues such as improper heat treatment, alloy defects, or material inconsistencies.
Traceability and certification: Compliance with the ASTM E10 standard ensures global recognition of test results in specifications, certifications, and engineering documentation. It aids regulatory and contractual compliance.
Applicability to hard materials: The Brinell test is particularly suitable for large-grained metals, castings, and forgings, which other tests such as Rockwell do not handle well due to surface irregularities.
Basis for design decisions: Hardness is often associated with tensile strength, wear resistance, and machinability. The ASTM E10 standard provides reliable data that engineers can use to design and evaluate components.

The general principle of the Brinell indentation hardness test consists of two steps. In the first step, the indentation is brought into contact with the test specimen in a direction perpendicular to the surface, and the test force is applied. The test force is held for a specified dwell time and then removed. In the second step, the indentation diameter is measured in at least two perpendicular directions. The Brinell hardness value is obtained from the average of the diameter measurements.

Brinell hardness testing equipment generally consists of a testing machine that supports the test specimen and applies an indentation force to a ball in contact with the specimen, and a system that measures the average diameter of the indentation, following the principles of the Brinell hardness test. The testing machine's design should ensure that there is no rocking or lateral movement of the indenter or specimen during the application of the force. The testing machine's design should ensure that the force applied to the indentation is uniform and without impact forces. Precautions should be taken to prevent momentary high test forces caused by factors such as system inertia or hydraulic system overshoot.

The measuring device used to measure the diameter of Brinell indentations can be an integral part of the hardness tester or a separate, standalone device. Allowable measuring devices are divided into two types. Type A instruments include microscopes with movable measuring lines and some form of display, computerized measuring system, or image analysis system. Type B instruments are hand-held microscopes with fixed measuring lines.

Our organization, which has been supporting businesses across all sectors for years through a wide range of testing, measurement, analysis, and evaluation activities, has a strong team of employees who closely follow global developments in science and technology and are constantly improving themselves. In this context, we also provide testing services in accordance with the ASTM E10 Standard Test Method for Brinell Hardness of Metallic Materials.