BS EN ISO 6506-1:2014 pdf free.Metallic materials – Brinell hardness test Part 1: Test method.
This part of ISO 6506 specifies the method for the Brinell hardness test for metallic materials. It is applicable to both fixed location and portable hardness testing machines.
For some specific materials and/or products, particular International Standards exist (e.g. ISO 4498) and make reference to this International Standard.
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 4498, Sintered metal materials, excluding hardmetals — Determination of apparent hardness and microhardness
ISO 6506-2:2014, Metallic materials — Brinell hardness test — Part 2: Verification and calibration of testing machines
ISO 6506-3:2014, Metallic materials — Brinell hardness test — Part 3: Calibration of reference blocks ISO 6506-4, Metallic materials — Brinell hardness test — Part 4: Table of hardness values
3 Principle
An indenter (tungsten carbide composite ball with diameter, D) Is forced into the surface of a test piece and, after removal of the force, F, the diameter of the indentation, d, left in the surface is measured.
The Brinell hardness is proportional to the quotient obtained by dividing the test force by the curved surface area of the indentation. The indentation is assumed to take the shape of the unloaded ball indenter, and its surface area is calculated from the mean indentation diameter and the ball diameter, using the formula given in Table 1.
4 Symbols and abbreviated terms
4.1 See Ejgurel and Table 1.
5 Apparatus
5.1 Testing machine, capable of applying a predetermined test force or test forces within the range of
9,807 N to 29,42 kN, in accordance with Iso 6506-2.
5.2 Indenter, a polished tungsten carbide composite ball, as specified in ISO 6506-2.
5.3 Indentation diameter measuring system, as specified in ISO 6506-2.
6 Test piece
6.1 The test shall be carried out on a surface which is smooth and even; free from oxide scale, foreign matter, and, in particular, free from lubricants. The test piece shall have a surface finish that will allow an accurate measurement of the diameter of the indentation.
NOTE For indentations made with the smaller ball indenters, it might be necessary to polish or lap the surface prior to making the indentation.
6.2 Preparation shall be carried out in such a way that any alteration of the surface, for example, due to excessive heating or cold-working, is minimized.
6.3 The thickness of the test piece shall be at least eight times the depth of indentation. Values for the minimum thickness of the test piece in relation to the mean diameter of indentation are given in Annex B. Visible deformation at the back of the test piece can indicate that the test piece is too thin.BS EN ISO 6506-1 pdf free download.