INTERNATIONAL STANDARD ISO 6508-1
Metallic materials — Rockwell hardness test —
Part 1:
Test method
ISO 6508 consists of the following parts, under the general title Metallic materials
—— Rockwell hardness test:
ISO 6508-1 Metallic materials —— Rockwell hardness test Part 1: Test method
ISO 6508-2 Metallic materials —— Rockwell hardness test Part 2: Verification and calibration of testing machines and indenters
ISO 6508-3 Metallic materials —— Rockwell hardness test Part 3: Calibration of refernce blocks
Contents
Foreword
1 Scope
2 Normative references
3 Principle
4 Symbols, abbreviated terms and designations
5 Testing machine
6 Test piece
7 Procedure
8 Uncertainty of the results
9 Test report
10 Conversions to other hardness scales or tensile strength values
Annex A (normative) Special HR30TSm and HR15TSm test for thin products
Annex B (normative) Minimum thickness of the test piece in relation to the Rockwell hardness
Annex C (normative) Corrections to be added to Rockwell hardness values obtained on convex cylindrical surfaces
Annex D (normative) Corrections to be added to Rockwell hardness C scale values obtained on spherical test surfaces of various diameters
Annex E (normative) Daily verification procedure
Annex F (normative) Inspection of diamond indenters
Annex G (informative) Uncertainty of the measured hardness values
Annex H (informative) CCM — Working group on hardness
Annex I (informative) Rockwell hardness measurement traceability
Bibliography
1 Scope
This part of ISO 6508 specifies the method for Rockwell regular and Rockwell superficial hardnes tests for scales A, B, C, D, E, F, G, H, K, 15N, 30N, 45N, 15T, 30T, and 45T for metallic materials and is
applicable to stationary and portable hardness testing machines.
For specific materials and/or products, other specific International Standards apply (for instance,
ISO 3738-1 and ISO 4498).
NOTE Attention is drawn to the fact that the use of tungsten carbide composite for ball indenters is
considered to be the standard type of Rockwell indenter ball. Steel indenter balls are allowed to continue to be
used only when complying with Annex A.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 6508-2:2015, Metallic materials — Rockwell hardness test — Part 2: Verification and calibration of
testing machines and indenters
ISO 6508-3:2015, Metallic materials — Rockwell hardness test — Part 3: Calibration of reference blocks
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