Foreword
Committees responsible
Methods
Section one. General
1 Scope
2 Definitions
3 Symbols and designations of hardness
Section two. Determination of Rockwell superficial
hardness
4 Principle
5 Test apparatus
6 Conditions of test
7 Test procedure
8 Calculations
Section three. Direct verification of accuracy of
testing machine
9 Principle
10 Traceability
11 Force
12 Indenter
13 Measuring device
14 Anvils
15 Performance test
Section four. Indirect verification of accuracy of
testing machine
16 Principle
17 Manufacture of hardness test blocks
18 Calibration of hardness test blocks
19 Standardizing machine
20 Procedure for indirect verification of testing
machine
21 Assessment of accuracy of the testing machine
Appendices
A Monitoring the accuracy of the testing machine
B Additional information on the superficial hardness
test (Rockwell)
C Corrections to Rockwell superficial hardness values
obtained on convex cylindrical surfaces
Tables
1 Rockwell superficial hardness scales
2 Dimensions of indenter balls for standardizing
machines
3 Permissible error in value of test block
4 Correction for test results obtained with diamond
cone indenter using HRN scales
5 Correction for test results obtained with ball
indenter using HRT scales
Figures
1 Test with diamond cone (Rockwell superficial scale
HRN)
2 Test with steel ball (Rockwell superficial scale
HRT)
3 Minimum thickness of test piece for Rockwell
superficial N scales
4 Minimum thickness of test piece for Rockwell
superficial T scales
5 Approximate diameter of indentation for calculation
of indentation location
6 Typical permissible monitoring results for a
standardizing machine
7 Testing machine repeatability requirements at
different hardness values