Hardness Conversion Calculator

Convert between Rockwell (HRC), Brinell (HB), and Vickers (HV) hardness values instantly. This tool is designed for engineers, machinists, and buyers who need quick reference conversions for material selection, heat treatment verification, and quality control.

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Calculator

👉（此处放置你的计算器插件）

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Quick Answer

There is no exact universal formula for hardness conversion, but common engineering approximations are:

• HRC ↔ HB ↔ HV are correlated through empirical tables
• Approximate ranges:

HRC	HB	HV
20 HRC	~235 HB	~240 HV
30 HRC	~285 HB	~290 HV
40 HRC	~375 HB	~390 HV
50 HRC	~515 HB	~540 HV
60 HRC	~650 HB	~700 HV

👉 These values are widely used for quick engineering reference.

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Formula / Conversion Method

Hardness conversion is not linear, and depends on:

• Material type (steel, aluminum, brass, etc.)
• Heat treatment condition
• Microstructure

👉 Therefore, conversions are based on empirical standards, not simple formulas.

However, for rough estimation:

HV approx HB

HB approx f(HRC) text

👉 Always use standard charts (ASTM E140) for critical applications.

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Hardness Conversion Reference Table

HRC	HB	HV
10	200	210
20	235	240
30	285	290
40	375	390
50	515	540
55	600	630
60	650	700
65	700+	760+

👉 Note: Values vary slightly depending on material.

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How to Use This Calculator

1. Enter a value in HRC, HB, or HV
2. The calculator automatically converts to the other scales
3. Results update instantly
4. Click Copy to save results
5. Click Reset to clear inputs

✔ Supports multiple hardness scales
✔ Real-time conversion
✔ Useful for engineering estimation

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Engineering Insight

Hardness is a critical property that affects strength, wear resistance, machinability, and durability.

Differences between hardness scales:

• HRC (Rockwell C):
  • Common for hardened steels
  • Fast and widely used in production
• HB (Brinell):
  • Used for softer metals and castings
  • Measures indentation over a larger area
• HV (Vickers):
  • High precision
  • Suitable for thin materials and coatings

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Why hardness conversion matters:

• Different industries use different scales
• Drawings and specifications may vary by region
• Suppliers may provide hardness in different units

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Practical machining impact:

• Higher hardness → lower machinability
• Higher hardness → higher tool wear
• Heat-treated parts require different cutting parameters

👉 Example:

• 60 HRC steel → requires carbide tools and low feed
• 200 HB steel → easy machining with high speed

💡 Tip:
Always confirm both hardness value and scale before production.

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Common Engineering Uses

CNC Machining

Select cutting tools and machining parameters.

Heat Treatment Verification

Ensure parts meet required hardness specifications.

Material Selection

Compare materials based on strength and wear resistance.

Quality Control

Check consistency across batches and suppliers.

Supplier Communication

Avoid confusion between different hardness scales.

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Related Calculators

• Surface Roughness Ra to Rz Calculator
• Feeds and Speeds Calculator
• Chip Load Calculator
• Material Removal Rate Calculator
• Density Calculator

👉 Combine these tools for complete machining parameter optimization.

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FAQ

Is hardness conversion exact?

No. It is based on empirical data and varies with material.

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Which hardness scale should I use?

• HRC → hardened steel
• HB → softer metals
• HV → precision measurement

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Can I directly convert HRC to HB?

Yes, but only approximately. Use standard charts for accuracy.

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What standard is used for hardness conversion?

ASTM E140 is the most commonly used reference.

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Why does hardness affect machining?

Higher hardness increases tool wear and reduces cutting speed.