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Prevodník HV na HB
Key Principles of HV and HB Hardness Testing
- Tvrdosť (HV)
- Measures a material’s resistance to plastic deformation using a diamond pyramid indenter under a specific load.
- Suitable for thin materials, surface coatings, and small components due to its small indentation.
- Brinell tvrdosť (HB)
- Uses a tungsten carbide or hardened steel ball indenter to create a larger indentation, ideal for coarse-grained materials like cast iron and non-ferrous alloys.
- HBW (tungsten carbide ball) has replaced HBS (steel ball) in most standards post-2003.
HV to HB Conversion Table
The table below aligns with DIN 50150 štandardy, correlating HV, HB, and tensile strength (N/mm²).
Highlighted values are commonly referenced in industrial applications:
| Pevnosť v ťahu (N/mm²) | Tvrdosť (HV) | Brinell tvrdosť (HB) |
|---|---|---|
| 255 | 80 | 76.0 |
| 320 | 100 | 95.0 |
| 400 | 125 | 119 |
| 480 | 150 | 143 |
| 560 | 175 | 166 |
| 640 | 200 | 190 |
| 720 | 225 | 214 |
| 800 | 250 | 238 |
| 900 | 280 | 266 |
| 1125 | 350 | 333 |
Poznámka: Values in parentheses (napr., HB 456) indicate extrapolated estimates for high-strength materials.
Practical Applications and Considerations
- Výber materiálu:
- Use HV for thin sheets or case-hardened layers; HB for bulk materials like forgings.
- Príklad: A component with HV 200 (HB 190) is ideal for moderate-stress automotive parts.
- Conversion Accuracy:
- HBW values are typically 5–10% higher than HBS for the same material due to differences in indenter material.
- Avoid direct conversions for materials with heterogeneous structures (napr., liatina).
- Standards Compliance:
- Od 50150 and ISO 18265 are widely accepted for industrial hardness conversions.
Why Trust This Guide?
- Data sourced from Od 50150, a globally recognized standard for hardness conversions.
- Recommendations align with metallurgical best practices for aerospace, automobilový priemysel, and tooling industries.
For the full conversion table, refer to Od 50150.
Further Reading
- Limitations of Hardness Testing:
- Surface finish, material anisotropy, and test load variability can affect results.
- Advanced Methods:
- Use microhardness tests (napr., HV 0.1) for precision measurements on coatings or heat-affected zones.
By integrating theoretical principles and empirical data, this guide ensures reliable HV-to-HB conversions for engineering excellence.
Related Hardness Conversion: https://langhe-metal.com/conversion-tools/hb-to-hv/