1. What is Hardness Conversion?

Hardness conversion between Brinell (BHN) and Rockwell C (HRC) scales allows engineers and metallurgists to compare material hardness values across different testing methods. This is particularly useful when specifications reference different hardness scales.

2. How Does the Calculator Work?

The calculator uses the approximation formula:

Where:

• \( HRC \) — Rockwell C hardness (unitless)
• \( BHN \) — Brinell hardness number (unitless)

Explanation: This formula provides a quick approximation for steels in the range of 100-300 BHN. For precise conversions, consult standard hardness conversion tables.

3. Importance of Hardness Conversion

Details: Accurate hardness conversion is essential for material selection, quality control, and ensuring compliance with engineering specifications that may use different hardness testing methods.

4. Using the Calculator

Tips: Enter Brinell hardness value between 100-300 BHN. The calculator will provide the approximate Rockwell C equivalent. Use conversion tables for more precise results.

5. Frequently Asked Questions (FAQ)

Q1: Why is this an approximation?
A: The relationship between BHN and HRC is not perfectly linear and varies by material composition. This formula provides a general approximation for steels.

Q2: What is the valid range for this conversion?
A: This approximation works best for steels with Brinell hardness between 100-300 BHN. Outside this range, consult conversion tables.

Q3: When should I use conversion tables instead?
A: For critical applications, material certification, or when working with non-standard alloys, always refer to standardized conversion tables.

Q4: Are there different conversion formulas for different materials?
A: Yes, conversion relationships vary significantly between different material types (aluminum, copper, steel, etc.) and heat treatment conditions.

Q5: How accurate is this approximation?
A: For most carbon and alloy steels, this approximation is within ±2 HRC of tabulated values, but always verify with official conversion standards for precision work.