Rockwell To Brinell Conversion Calculator

Conversion Formula:

\[ \text{Approximate HB} = 5.970 \times \text{HRC} + 104.7 \text{ (for 21-30 HRC)} \]

Brinell Hardness (HB):

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1. What is Rockwell to Brinell Conversion?

The Rockwell to Brinell conversion provides approximate equivalent hardness values between these two measurement scales. Since different hardness tests measure different material properties, conversions are approximate and range-specific.

2. How Does the Calculator Work?

The calculator uses range-specific formulas:

For HRC 21-30: \[ HB = 5.970 \times HRC + 104.7 \]

For HRC 30-40: \[ HB = 8.570 \times HRC + 27.6 \]

For HRC 40-50: \[ HB = 11.158 \times HRC - 79.6 \]

Where:

\( HRC \) — Rockwell C hardness (dimensionless)
\( HB \) — Brinell hardness number

Explanation: Different formulas are used for different HRC ranges because the relationship between scales isn't linear across all hardness values.

3. Importance of Hardness Conversion

Details: Converting between hardness scales is important when material specifications or test requirements use different measurement systems. However, for critical applications, actual testing in the required scale is recommended.

4. Using the Calculator

Tips: Enter Rockwell C hardness value (HRC). The calculator will provide the approximate equivalent Brinell hardness (HB) based on the input range.

5. Frequently Asked Questions (FAQ)

Q1: How accurate are these conversions?
A: Conversions are approximate (±5-10%). For precise requirements, measure hardness using the required scale.

Q2: Why are different formulas used for different ranges?
A: The relationship between scales varies with hardness level, requiring range-specific formulas for better accuracy.

Q3: Can I use this for all materials?
A: These conversions work best for steels. Different conversion factors may be needed for other materials.

Q4: What if my HRC value is outside the standard ranges?
A: The calculator will use the general approximation formula, but results may be less accurate.

Q5: When should I use actual testing instead of conversion?
A: For critical applications, quality control, or when material specifications require actual Brinell measurements.