1. What is Rockwell 30T Hardness?

The Rockwell 30T scale is a superficial hardness scale used for testing thin materials or case-hardened surfaces. It uses a 1/16" diameter steel ball indenter with a 30 kgf major load.

2. How Does the Calculator Work?

The calculator provides approximate conversions between Rockwell 30T and other hardness scales:

Note: Exact conversions require consulting ASTM E140 standard tables as the relationship is non-linear and material-dependent.

3. Importance of Hardness Conversion

Details: Converting between hardness scales is important when comparing materials tested with different methods or when specifications reference different scales.

4. Using the Calculator

Tips: Enter a valid HR30T hardness value and select the target scale. The calculator will provide the approximate equivalent value.

5. Frequently Asked Questions (FAQ)

Q1: What materials is HR30T used for?
A: HR30T is typically used for thin sheets, case-hardened surfaces, or materials where regular Rockwell scales would penetrate too deeply.

Q2: How accurate are hardness conversions?
A: Conversions are approximate as the relationship between scales varies by material. For critical applications, test in the required scale.

Q3: What's the difference between HR30T and HRB?
A: Both use a ball indenter, but HR30T uses a lighter load (30kgf vs. 100kgf) and is considered a superficial test.

Q4: Can I convert HR30T to Brinell hardness?
A: Yes, but the conversion is less reliable than between Rockwell scales due to different test methods.

Q5: Why are there no simple conversion formulas?
A: The relationship between scales is non-linear and material-dependent, requiring empirical data tables.