Brinell To Rockwell Calculator

Conversion Formula:

\[ HRC \approx -0.2 \times BHN + 100 \text{ (approximate)} \]

Rockwell C Hardness (HRC):

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1. What is Brinell to Rockwell Conversion?

The Brinell to Rockwell conversion provides an approximate relationship between Brinell Hardness Number (BHN) and Rockwell C Hardness (HRC) scales. This empirical conversion is useful for material selection and quality control in metallurgy and manufacturing.

2. How Does the Calculator Work?

The calculator uses the empirical conversion formula:

\[ HRC \approx -0.2 \times BHN + 100 \text{ (approximate)} \]

Where:

\( HRC \) — Rockwell C Hardness (unitless)
\( BHN \) — Brinell Hardness Number (unitless)
\( -0.2 \) — Empirical conversion coefficient
\( 100 \) — Empirical constant offset

Explanation: This formula provides an approximate linear relationship between BHN and HRC scales, though exact conversion may vary by material type and specific standards.

3. Importance of Hardness Conversion

Details: Accurate hardness conversion is essential for material specification, quality assurance, and ensuring mechanical properties meet design requirements across different testing methods.

4. Using the Calculator

Tips: Enter Brinell Hardness Number (BHN) as a positive value. The calculator will provide the approximate Rockwell C Hardness (HRC) equivalent.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this conversion?
A: This is an empirical approximation. For precise conversions, consult official conversion tables or material-specific standards.

Q2: What are typical BHN values for common materials?
A: Mild steel: 120-180 BHN, Tool steel: 200-700 BHN, Hardened steel: 400-600 BHN, Aluminum alloys: 50-150 BHN.

Q3: When should I use conversion tables instead?
A: For critical applications, material certification, or when working with specific alloy types, always refer to standardized conversion tables.

Q4: Are there limitations to this conversion?
A: Yes, accuracy varies by material composition, heat treatment, and the specific range of hardness values being converted.

Q5: Can this conversion be used for all materials?
A: This formula works best for ferrous metals. Different materials may require specific conversion relationships.