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HRB to BHN Conversion Formula:
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The HRB to BHN conversion provides an approximate relationship between Rockwell B hardness scale and Brinell hardness number for steels. This empirical formula allows for quick conversion between these two common hardness measurement systems.
The calculator uses the conversion formula:
Where:
Note: This is an empirical approximation for steels. For precise conversions, consult official hardness conversion tables as the relationship may vary by material composition and heat treatment.
Details: Converting between different hardness scales is essential when comparing material specifications, quality control data, or when equipment limitations require using one test method over another while needing results in a different scale.
Tips: Enter the Rockwell B hardness value (HRB) in the input field. The value must be greater than 0. The calculator will provide the approximate Brinell Hardness Number (BHN).
Q1: How accurate is this conversion formula?
A: This is an empirical approximation suitable for general steel applications. For critical applications, always refer to official ASTM or ISO hardness conversion tables.
Q2: Can this formula be used for all materials?
A: No, this formula is specifically calibrated for steels. Different materials (aluminum, copper, etc.) have different conversion relationships.
Q3: What are typical HRB values for common steels?
A: Mild steels typically range from 60-80 HRB, while hardened steels can reach 100+ HRB. The exact values depend on composition and heat treatment.
Q4: When should I use conversion tables instead?
A: Use official conversion tables for quality control, material certification, or when precise values are required for engineering calculations.
Q5: Are there limitations to this conversion?
A: Yes, the relationship becomes less accurate at extreme hardness values and for materials with significantly different work hardening characteristics.