Hardness Conversion Calculator BHN To HRC

Hardness Conversion Formula:

\[ HRC \approx 20 \times \log_{10}(BHN / 100) + \text{adjustment (empirical)} \]

Rockwell C Hardness (HRC):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Hardness Conversion?

Hardness conversion between Brinell Hardness Number (BHN) and Rockwell C (HRC) provides an empirical relationship to convert hardness values between different testing scales. This is useful when materials are tested using different methods or when comparing specifications.

2. How Does the Calculator Work?

The calculator uses the hardness conversion formula:

\[ HRC \approx 20 \times \log_{10}(BHN / 100) + \text{adjustment (empirical)} \]

Where:

\( BHN \) — Brinell Hardness Number (unitless)
\( HRC \) — Rockwell C Hardness (unitless)
\( \text{adjustment} \) — Empirical adjustment factor

Explanation: The formula approximates Rockwell C hardness from Brinell hardness number using logarithmic scaling with empirical adjustments for material-specific characteristics.

3. Importance of Hardness Conversion

Details: Accurate hardness conversion is crucial for material specification compliance, quality control in manufacturing, and ensuring mechanical properties meet design requirements across different testing standards.

4. Using the Calculator

Tips: Enter Brinell Hardness Number (BHN) and appropriate adjustment factor based on material type and empirical data. BHN must be greater than 0 for valid calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is hardness conversion necessary?
A: Different industries and standards use various hardness scales, and conversion allows comparison and specification compliance across testing methods.

Q2: How accurate are hardness conversions?
A: Conversions are empirical approximations and may vary by material type, heat treatment, and testing conditions. Direct testing is always more accurate.

Q3: What factors affect the adjustment value?
A: Material composition, heat treatment history, testing method variations, and specific alloy characteristics influence the empirical adjustment factor.

Q4: Are there limitations to this conversion?
A: The conversion is most reliable for common steel alloys and may be less accurate for non-ferrous metals, very hard materials, or specialized alloys.

Q5: When should direct testing be used instead of conversion?
A: For critical applications, quality certification, or when material behavior differs significantly from standard alloys, direct hardness testing is recommended.