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HRC to BHN Conversion Formula:
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The HRC to BHN conversion provides an approximate relationship between Rockwell C hardness and Brinell hardness numbers. This conversion is useful when comparing material specifications or when only one hardness scale measurement is available.
The calculator uses the conversion formula:
Where:
Explanation: This empirical formula provides an approximate conversion between the two hardness scales, though actual values may vary depending on material composition and testing conditions.
Details: Accurate hardness conversion is essential for material selection, quality control, and ensuring compatibility between different testing methods and specifications in manufacturing and engineering applications.
Tips: Enter Rockwell C hardness value between 0-70 HRC. The calculator will provide the approximate Brinell hardness number. Note that this is an empirical conversion and actual values may vary.
Q1: How accurate is this conversion?
A: This is an empirical approximation. Actual conversion may vary by ±5-10% depending on material type, heat treatment, and testing conditions.
Q2: What are typical HRC ranges for common materials?
A: Tool steels: 55-65 HRC, structural steels: 20-40 HRC, aluminum alloys: 20-80 BHN (equivalent to approximately 0-25 HRC).
Q3: When should I use direct measurement instead of conversion?
A: For critical applications requiring precise hardness values, always use direct measurement with the appropriate scale rather than relying on conversions.
Q4: Are there limitations to this conversion?
A: The conversion is less accurate at extreme hardness values and may not be valid for all material types, particularly non-ferrous metals and hardened surfaces.
Q5: Can I convert BHN back to HRC?
A: Yes, the reverse conversion is possible but requires solving the equation for HRC, which can be done mathematically.