1. What is BHN to HRC Conversion?

The BHN to HRC conversion provides an approximate relationship between Brinell Hardness Number and Rockwell C hardness scales. This conversion is useful when comparing material hardness values across different testing methods.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

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

Explanation: This formula provides an approximate conversion between BHN and HRC hardness scales, with BHN 220 converting to approximately HRC 66.

3. Importance of Hardness Conversion

Details: Accurate hardness conversion is crucial for material selection, quality control, and comparing hardness values from different testing methods in engineering and manufacturing applications.

4. Using the Calculator

Tips: Enter the Brinell Hardness Number (BHN) value. The calculator will provide the approximate Rockwell C hardness (HRC) equivalent. Default value is set to 220 BHN for quick reference.

5. Frequently Asked Questions (FAQ)

Q1: Why convert between BHN and HRC?
A: Different industries and applications may use different hardness scales. Conversion allows comparison and standardization across testing methods.

Q2: How accurate is this conversion?
A: This provides an approximate conversion. Actual values may vary depending on material composition, heat treatment, and testing conditions.

Q3: 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: 20-120 BHN.

Q4: When is BHN testing preferred over HRC?
A: BHN is often used for softer materials and castings, while HRC is preferred for harder materials and heat-treated steels.

Q5: Are there limitations to this conversion?
A: Yes, conversions are approximate and may not be accurate for all materials, especially at extreme hardness values or for non-ferrous metals.