1. What is BHN to HRB Conversion?

The BHN to HRB conversion formula provides an approximate method to convert Brinell Hardness Number (BHN) to Rockwell B Hardness (HRB). This conversion is useful in materials testing and quality control applications where different hardness scales are used.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

• \( HRB \) — Rockwell B Hardness (unitless)
• \( BHN \) — Brinell Hardness Number

Explanation: This formula provides an approximate conversion between the two hardness scales, with HRB decreasing as BHN increases.

3. Importance of Hardness Conversion

Details: Accurate hardness conversion is crucial for materials specification, quality control, and ensuring compatibility between different testing methods and standards.

4. Using the Calculator

Tips: Enter the Brinell Hardness Number (BHN) in the input field. The value must be greater than 0. The calculator will provide the approximate Rockwell B Hardness (HRB) value.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this conversion formula?
A: This formula provides an approximate conversion. For precise measurements, direct testing using the appropriate hardness scale is recommended.

Q2: What are typical BHN values for common materials?
A: BHN values vary by material: mild steel (120-180), hardened steel (200-600), aluminum alloys (60-100), copper alloys (40-150).

Q3: What is the range of validity for this conversion?
A: This conversion works best for materials where both BHN and HRB scales are applicable, typically for softer metals and alloys.

Q4: Why convert between hardness scales?
A: Different industries and standards may require specific hardness scales. Conversion allows comparison and specification across different testing methods.

Q5: Are there limitations to this conversion?
A: Yes, conversions between hardness scales are approximate and may vary based on material composition, heat treatment, and testing conditions.