GOST R ISO 4545-4-2015

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  ГОСТ Р ИСО 4545-4-2015

GOST R ISO 4545−4-2015 Materials metal. Determination of hardness Knopw. Part 4. Table of hardness values

GOST R ISO 4545−4-2015

Group B09

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

MATERIALS METAL

Determination of hardness Knopw

Part 4

Table of hardness values

Metallic materials. Knoop hardness test. Part 4. Table of hardness values

OKS 77.040.10

Date of introduction 2016−01−01

Preface

1 PREPARED AND SUBMITTED by the Technical Committee for standardization TC 145 «monitoring Methods of steel products» on the basis of authentic translation into the Russian language of the standard, referred to in paragraph 3

2 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology of April 21, 2015 N 277-St

3 this standard is identical with ISO 4545−4:2005* «metal Materials. Determination of hardness Knopw. Part 4. Table of hardness values» (ISO 4545−4:2005 «Metallic materials — Knoop hardness test — Part 4: Table of hardness values»).

In applying this standard it is recommended to use instead of the referenced international standards corresponding national standards of the Russian Federation, details of which are given in Appendix YES

4 INTRODUCED FOR THE FIRST TIME


Application rules of this standard are established in GOST R 1.0−2012 (section 8). Information about the changes to this standard is published in the annual (as of January 1 of the current year) reference index «National standards» and the official text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the upcoming issue of the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet (www.gost.ru)

1 Scope

This standard specifies a method for determining hardness of metallic materials Knopw when testing on flat surfaces ISO 4545−1.

2 Normative references

The present standard features references to the following standards*:
_______________
* The table of conformity of national standards international see the link. — Note the manufacturer’s database.


ISO 4545−1:2005 metallic Materials. Determination of hardness Knopw. Part 1. Test method (ISO 4545−1, Metallic materials — Knoop hardness test — Part 1: Test method).

ISO 4545−2:2005 metallic Materials. Determination of hardness Knopw. Part 2. Verification and calibration of testing machines (ISO 4545−2:2005, Metallic materials — Knoop hardness test — Part 2: Verification and calibration of testing machines)

3 hardness

Hardness Knopw NC, are shown in table 1, is calculated by the formula

, (1)

where is the applied load, N;

 — the length of the long diagonal of the imprint, mm;

is a constant of the indenter, equal to = ,

where and  — the angles between the opposite angles vertex of the diamond pyramid, as provided in ISO 4545−2.

Ideally =0,07028.

Table 1 — Hardness Knopw, NC