1 - AS 2025-1991 METALLIC MATERIALS - ROCKWELL SUPERFICIAL HARDNESS TEST - N AND T SCALES
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 REFERENCED DOCUMENTS
6 - 1.3 DEFINITIONS
6 - 1.3.1 Arithmetic mean deviation
6 - 1.3.2 Calibration
6 - 1.3.3 Calibrating authority
6 - 1.3.4 Hardness test blocks
6 - 1.3.5 Indenter, reference
6 - 1.3.6 Indenter, standard
6 - 1.3.7 Standard hardness blocks
6 - 1.3.8 Standardizing authority
6 - 1.3.9 Test piece
6 - 1.3.10 Test specimen
6 - 1.3.11 Normative
7 - 1.4 ROCKWELL TEST PRINCIPLE
7 - 1.5 DESIGNATION OF ROCKWELL SUPERFICIAL HARDNESS
8 - 1.6 HARDNESS CONVERSIONS
9 - SECTION 2 TESTING OF METALS
9 - 2.1 GENERAL
9 - 2.2 TESTING MACHINE
9 - 2.2.1 General
9 - 2.2.2 Installation
9 - 2.2.3 Calibration
9 - 2.3 INDENTERS
9 - 2.4 ANVIL
9 - 2.5 MAINTENANCE OF THE TESTING MACHINE BY THE USER
9 - 2.5.1 General
9 - 2.5.2 Inspection of components and operations
9 - 2.5.3 Performance tests by the user
9 - 2.5.4 Record of user tests
10 - 2.5.5 Assessment of results of user tests
10 - 2.6 TEST PIECE
10 - 2.6.1 Preparation of test piece
10 - 2.6.2 Thickness of test piece
10 - 2.7 TEST PROCEDURE
11 - 2.8 RECORD OF TEST RESULTS
12 - 2.9 TEST REPORT
13 - SECTION 3 COMPLETE CALIBRATION OF THE TESTING MACHINE
13 - 3.1 GENERAL
13 - 3.2 PRELIMINARY INSPECTION
13 - 3.3 CALIBRATION OF APPLIED FORCES
13 - 3.3.1 Calibrating equipment
13 - 3.3.2 Preliminary force (initial setting)
13 - 3.3.3 Preliminary force (after application and removal of the additional force)
14 - 3.3.4 Total force
14 - 3.4 CALIBRATION OF MEASURING APPARATUS
14 - 3.4.1 Scale
14 - 3.4.2 Calibration ranges
14 - 3.4.3 Accuracy
14 - 3.5 VISUAL EXAMINATION OF INDENTERS
14 - 3.5.1 Diamond cone indenter
14 - 3.5.2 Steel ball indenter
14 - 3.6 PERFORMANCE TEST
14 - 3.6.1 Preparation of steel ball indenters prior to the performance test
14 - 3.7 RECORD OF RESULTS
15 - 3.8 REPORT OF COMPLETE CALIBRATION
16 - SECTION 4 PARTIAL CALIBRATION OF THE TESTING MACHINE
16 - 4.1 GENERAL
16 - 4.2 PRELIMINARY INSPECTION
16 - 4.3 INDENTING PROCEDURE
16 - 4.3.1 General
16 - 4.3.2 Calibration procedure
16 - 4.4 ASSESSMENT OF PERFORMANCE
16 - 4.4.1 Acceptance
17 - 4.4.2 Repeatability
17 - 4.4.3 Error
18 - 4.5 RECORD OF RESULTS
18 - 4.6 REPORT OF PARTIAL CALIBRATION
19 - SECTION 5 CALIBRATION OF STANDARD HARDNESS BLOCKS
19 - 5.1 GENERAL
19 - 5.2 REQUIREMENTS FOR STANDARD HARDNESS BLOCKS
19 - 5.3 CALIBRATION OF BLOCKS
19 - 5.3.1 Procedure
19 - 5.3.2 Uniformity of hardness
19 - 5.3.3 Assigned value
19 - 5.3.4 Report
19 - 5.4 STANDARDlZING MACHINE
19 - 5.4.1 General
19 - 5.4.2 Forces
20 - 5.4.3 Reference indenters
20 - 5.4.4 Measuring apparatus
20 - 5.4.5 Application of forces
20 - 5.4.6 Verification of standardizing machine
21 - SECTION 6 CALIBRATION OF STANDARD DIAMOND CONE INDENTERS AND STEEL BALLS
21 - 6.1 GENERAL
21 - 6.2 DIAMOND CONE INDENTER
21 - 6.2.1 Condition
21 - 6.2.2 Dimensions
21 - 6.2.3 Performance
21 - 6.3 STEEL BALL INDENTER
21 - 6.3.1 Sampling for assessment of batch
21 - 6.3.2 Surface condition
21 - 6.3.3 Diameter
21 - 6.3.4 Hardness
22 - APPENDIX A - TESTS ON CURVED SURFACES