ASTM E18 Rockwell Hardness of Metallic Materials
ASTM E18 test method determines the Rockwell hardness of metallic materials by the Rockwell indentation hardness principle. This test method provides information on metallic materials related to their tensile strength, wear resistance, and ductility. This test is useful in quality control and the selection of materials.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM E18 is a widely used standard test method for determining the Rockwell hardness of metallic materials. The test measures the depth of permanent indentation produced by a specified indenter under a minor and major load. Rockwell hardness testing is valued for its speed, simplicity, and direct readout, making it suitable for production control, material comparison, and quality assurance of metals and alloys.
Scope, Applications, and Benefits
Scope
The ASTM E18 Rockwell hardness test is an empirical indentation-based hardness test that provides useful information about metallic materials. Rockwell hardness (HRC) is commonly used for high-hardness materials and to determine hardness after heat treatment. The standard is used to determine the relevant physical characteristics of metallic materials under test, to meet acceptance testing requirements for commercial shipments, and to support quality control and material selection.
Applications
- Quality control and inspection of metallic components
- Material selection and comparison of metals and alloys
- Heat treatment verification and process control
- Evaluation of mechanical properties in manufacturing
Benefits
- Rapid and simple hardness measurement
- Minimal specimen preparation required
- Non-destructive to finished components
- High repeatability and reproducibility
- Applicable to a wide range of metallic materials
Testing Process
Specimen Preparatio
Prepare a clean, smooth, flat test surface, then select the appropriate Rockwell scale.
1Minor Load Application
Apply the specified minor load to seat the indenter and establish a reference position.
2Major Load Application
Apply the major load for the required dwell time, then remove it while retaining the minor load.
3Hardness Reading
Read and record the Rockwell hardness value directly from the machine or display.
4Technical Specifications
| Parameter | Details |
|---|---|
| Materials | Metallic materials |
| Indenter | Diamond cone or carbide ball |
| Total Test Forces | 60, 100, 150 kgf |
| Measurement Basis | Indentation depth |
| Test Temperature | 10°C–35°C |
| Result Format | Hardness number + scale |
Instrumentation Used
- Rockwell hardness testing machine
- Diamond cone (Brale) or steel ball indenter
- Load the application and control system
- Specimen anvil or support
- Hardness value display or data recording system
Results and Deliverables
- The Rockwell hardness value is obtained for the selected scale (e.g., HRA, HRB, HRC)
- Results indicate the material’s resistance to permanent indentation.
- Consistent readings confirm uniform material hardness.
- Variations in values may indicate differences in material composition or heat treatment.
- Results support quality control, material comparison, and process verification.
Frequently Asked Questions
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