ASTM E18 is a widely used standard that provides test methods for determining the Rockwell hardness of metallic materials. The Rockwell hardness test measures the indentation hardness of a material, providing information about its resistance to permanent deformation and its mechanical properties. The values obtained indicate the tensile strength, wear resistance, ductility, and other physical properties of metallic materials, and could be utlized as valuable information for quality control and material selection.
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Introduction to ASTM E18
ASTM E18 establishes standardized procedures for performing Rockwell hardness tests on metallic materials. It is applicable to a wide range of metallic materials, including ferrous metals, nonferrous metals, and alloys. The test method provides a convenient and reliable way to assess the hardness of materials, making it useful in quality control, material selection, and research applications.
ASTM E18 test method is useful for qualitative characterization, research, development, and specification purposes.
ASTM E18 Test Method
The ASTM E18 test method specimen’s surface is prepared by cleaning, removing any contaminants, and ensuring a flat and smooth testing surface. The test involves the following:
Rockwell Hardness Scales
ASTM E18 defines multiple scales (e.g., A, B, C, D, E, F, G, H, K) to measure the hardness of different materials. Each scale has specific load and indenter configurations suitable for specific material types and hardness ranges.
Indentation and Hardness Measurement
The Rockwell hardness test is performed by applying a minor load to set the zero position, followed by applying a major load. The major load is maintained for a specific duration, after which it is released. The depth of the remaining indentation is measured using a depth-measuring microscope or a dial gauge, providing a hardness value on the Rockwell scale.
ASTM E18 Specimens
Specimen details
ASTM E18 does not specify the exact details of the specimens. Instead, it provides guidelines for preparing the specimen’s surface and measuring its hardness using the Rockwell hardness test method.
Specimen preparation
Specimens are injection molded or, cut from molded or extruded sheets or plates, or cut from molded or extruded shapes.
ASTM E18 Results
The Rockwell hardness determined by the test method ASTM E18 provides a numerical value that represents the material’s indentation hardness on a specific scale. The higher the hardness value, the greater the material’s resistance to indentation and deformation. The test results are used for material comparisons, quality control, material selection, and determining material suitability for specific applications.
Tests Related to ASTM E18
ASTM E10: Standard Test Method for Brinell Hardness of Metallic Materials is a related standard.
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The required number of samples or specimens should comply with the procedure given in the astm e18 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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