1. What is BHN to HBW Conversion?

BHN (Brinell Hardness Number) and HBW (Hardness Brinell Tungsten) are essentially equivalent hardness scales. The main difference is in the indenter material (HBW uses a tungsten carbide ball while BHN typically used a steel ball).

2. How Does the Calculator Work?

The calculator uses the simple conversion:

Where:

• \( BHN \) — Brinell Hardness Number
• \( HBW \) — Hardness Brinell Tungsten

Explanation: For most practical purposes, BHN and HBW values are considered equivalent, though HBW is the more modern designation.

3. Importance of Hardness Conversion

Details: Understanding hardness conversions is important for material specification, quality control, and comparing materials tested with different standards.

4. Using the Calculator

Tips: Simply enter the BHN value to get the equivalent HBW value. The value must be positive.

5. Frequently Asked Questions (FAQ)

Q1: Are BHN and HBW exactly the same?
A: While numerically equivalent, BHN typically used a steel ball indenter while HBW uses tungsten carbide, which is more durable.

Q2: When should I use HBW instead of BHN?
A: HBW is the modern designation per ISO 6506 and ASTM E10 standards. BHN is an older term.

Q3: Are there any materials where BHN and HBW differ?
A: For very hard materials, there might be slight differences due to indenter deformation, but for most practical purposes they're equivalent.

Q4: What's the typical range for BHN/HBW values?
A: Common metals range from about 50 HBW (soft aluminum) to 700 HBW (hardened tool steels).

Q5: Can this conversion be used for all materials?
A: This simple conversion works for metals where both scales are applicable. For other materials, different hardness scales may be needed.