Steel Hardness Conversion Calculator

Steel Hardness Conversion:

Converts between Rockwell C (HRC) and Brinell (HB) hardness scales

Rockwell C Hardness (HRC):

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1. What is Steel Hardness Conversion?

Steel hardness conversion refers to the process of converting hardness values between different measurement scales, particularly between Brinell (HB) and Rockwell C (HRC) scales. Different industries and applications may prefer one scale over another.

2. How Does the Calculator Work?

The calculator uses established conversion tables to translate Brinell hardness values (HB) to Rockwell C values (HRC):

HRC ≈ (HB - 100) / 6 (approximation)

Where:

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

Note: This is an approximation. For precise conversions, consult official conversion tables as the relationship is not perfectly linear across all hardness ranges.

3. Importance of Hardness Conversion

Details: Accurate hardness conversion is essential in materials engineering, quality control, and manufacturing where different hardness testing methods may be used for the same material. It ensures consistent specifications and quality standards across different measurement systems.

4. Using the Calculator

Tips: Enter the Brinell hardness value (HB) between 100-700. The calculator will provide the approximate equivalent Rockwell C hardness (HRC) value. Note that conversion is most accurate for medium-hardness steels.

5. Frequently Asked Questions (FAQ)

Q1: Why are there different hardness scales?
A: Different scales were developed for different materials and applications. Brinell is better for rough surfaces or heterogeneous materials, while Rockwell is faster and leaves a smaller indentation.

Q2: Is the conversion perfectly accurate?
A: No, conversion between scales is approximate. The relationship varies slightly based on material composition and heat treatment. For critical applications, use the same testing method consistently.

Q3: What is the typical range for steel hardness?
A: Most engineering steels range from 150-650 HB, which corresponds to approximately 0-60 HRC.

Q4: When should I use HB vs HRC?
A: Use Brinell (HB) for castings, forgings, and materials with coarse microstructure. Use Rockwell (HRC) for finished products, heat-treated parts, and when quick testing is needed.

Q5: Are there other hardness scales?
A: Yes, other common scales include Vickers (HV), Knoop (HK), and Rockwell B (HRB) for softer materials.