INTERNATIONAL STANDARD ISO 4545-2
Metallic materials — Knoop hardness test —
Part 2:
Verification and calibration of testing machines
ISO 4545 consists of the following parts, under the general title Metallic materials —— Knoop hardness test:
ISO 4545-1:2005, Metallic materials — Knoop hardness test — Part 1: Test method
ISO 4545-2, Metallic materials — Knoop hardness test — Part 2: Verification and calibration of testing machines
ISO 4545-3:2005, Metallic materials — Knoop hardness test — Part 3: Calibration of reference blocks
ISO 4545-4, Metallic materials — Knoop hardness test — Part 4: Table of hardness values
標準狀態(tài)：已作廢
替代情況：被 ISO 4545-2:2017替代
Contents
Foreword
1. Scope
2. Normative references
3. General conditions
4. Direct verification
5. Indirect verification
6. Intervals between verifications
7. Verification report/calibration certificate
Annex A (informative) Notes on diamond indenters
Annex B (informative) Uncertainty of measurement of the calibration results of the hardness testing machine
Bibliography
1 Scope
This part of ISO 4545 specifies the method of verification of testing machines for determining Knoop hardness for metallic materials in accordance with ISO 4545-1-1. It covers test forces from 0,098 07 N to 19,614 N. The method is recommended only for indentations with diagonals W 0,020 mm.
It specifies a direct verification method for checking the main functions of the machine, and an indirect verification method suitable for the overall checking of the machine. The indirect verification method may be used on its own for periodic routine checking of the machine in service.
If a testing machine is also to be used for other methods of hardness testing, it should be verified independently for each method.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 376:2004, Metallic materials — Calibration of force-proving instuments used for the verification of uniaxial testing machines
ISO 4545-1:2005, Metallic materials — Knoop hardness test — Part 1: Test method
ISO 4545-3, Metallic materials — Knoop hardness test — Part 3: Calibration of reference blocks
相關標準：
國家標準GB/T 18449.2-2012 《金屬材料 努氏硬度試驗 第2部分：硬度計的檢驗與校準》
本標準使用重新起草法修改采用國際標準ISO4545-2:2005《金屬材料 努氏硬度試驗 第2部分:硬度計的檢驗就校準》(第一版),在文本結(jié)構(gòu)和技術內(nèi)容方面與ISO4545-2:2005一致。
本標準與ISO4545-2:2005的技術性差異及其原因如下:
——刪除了ISO4545-2:2005的前言,重新編寫了前言;
——關于規(guī)范性引用文件,本部分做了具有技術性差異的調(diào)整,以適應我國的技術條件,調(diào)整的內(nèi)容集中反映在第2章“規(guī)范性引用文件”中,具體調(diào)整如下:
● 用等同采用國際標準的GB/T13634代替ISO376(見4.2.2);
● 用修改采用國際標準的GB/T18449.1—2009代替ISO4545-1:2005(見第1章、4.2.1、4.3.5、4.5、5.5和附錄B);
● 用修改采用國際標準的GB/T18449.3代替ISO4545-3:2005(見5.1);
——改正了附錄B的表B.3、表B.4、表B.5和表B.8中一些錯誤的計算結(jié)果和數(shù)據(jù)，并在做過改正的地方用下劃線注明;
——規(guī)范了附錄B中向公式里代人數(shù)值的一些計算式的表達方法;
——將附錄B的式(B.10)、式(B.13)和表B.9中的符號用符號"E"替換；
——刪除了參考文獻。
本標準與ISO4545-2:2005相比存在技術性差異,這些差異涉及的條款已通過在其外側(cè)頁邊空白位置的垂直單線(∣)進行了標示。
本標準還做了如下編輯性修改:
——用“ISO 4545 的本部分”一詞改為“本部分”;
——用中文的小數(shù)點符號“.”代替英文的小數(shù)點符號“,”。
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