International Standard ISO 6508-3:2015(E)
Metallic materials — Rockwell hardness test —
Part 3:
Calibration of reference blocks
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
Content
Foreword
1 Scope
2 Normative references
3 Manufacture of reference blocks
4 Calibration machine and calibration indenter
4.1 General
4.2 Calibration machine
4.3 Calibration diamond indenter
4.4 Calibration ball indenter
5 Calibration procedure
6 Number of indentations
7 Uniformity of hardness
8 Marking
9 Calibration certificate
10 Validity
Annex A (normative) Uniformity of reference blocks
Annex B (informative) Uncertainty of the mean hardness value of hardness-reference blocks
Annex C (normative) Requirements for reference diamond indenters
Bibliography
1 Scope
This part of ISO 6508 specifies a method for the calibration of reference blocks to be used for the indirect
and daily verification of Rockwell hardness testing machines, as specified in ISO 6508-2:2015.
Attention is drawn to the fact that the use of hard metal for ball indenters is considered to be the
standard type of Rockwell indenter ball. Steel indenter balls can be used only when complying with
ISO 6508-1:2015, 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 376, Metallic materials — Calibration of force-
proving instruments used for the verification of uniaxial testing machines
ISO 6508-1:2015, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 6508-2:2015, Metallic materials — Rockwell hardness test — Part 2: Verification and calibration of
testing machines and indenters
相關標準
國家標準GB/T 230.3-2012《金屬材料 洛氏硬度試驗 第3部分：標準硬度塊的標定》
本標準使用重新起草法修改采用國際標準ISO6508-3:2005《金屬材料 洛氏硬度試驗 第3部分:標準硬度塊(A、B、C、D、E、F、G、H、K、N、T標尺)的標定》(第二版),在文本結構和技術內容方面與ISO6508-3:2005一致。
本部分與ISO6508-3:2005的技術性差異及其原因如下:
—— 刪除了ISO6508-3:2005的前言,重新編寫了前言;
—— 關于規(guī)范性引用文件,本標準做了具有技術性差異的調整,以適應我國的技術條件,調整的內容集中反映在第2章“規(guī)范性引用文件”中,具體調整如下:
● 用修改采用國際標準的GB/T230.1代替ISO6508-1(見4.5、5.1和附錄B);
● 用修改采用國際標準的GB/T230.2—2012代替ISO6508-2:2005(見第1章、4.1、4.6和第B.1章);
● 用等同采用國際標準的GB/T3505—2009代替ISO4287:1997(見3.5);
● 用等同采用國際標準的GB/T13634代替ISO376(見4.4);
—— 修改了表1的內容,并規(guī)范了表中所列“標尺”和“洛氏硬度單位”的表示方式;
—— 將7.1的公式(3)中的符號“U”用符號“J”替換;將公式(4)中的符號“Urel”用符號“Jrel”替換;
—— 將圖A.1中曲線上的1%h、1.5%h 和2%h 分別改成1.0%、1.5%和2.0%,將圖A.2中曲線上的0.02h 和0.03h 分別改成2.0%和3.0%;
—— 改正了附錄B中及表B.4中一些錯誤的數(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中向公式里代入數(shù)值的一些計算式的表達方法;
—— 刪除了參考文獻。
本標準與ISO6508-3:2005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頁邊空白位置的垂直單線(|)進行了標示。
本標準還做了下列編輯性修改:
—— 將“ISO6508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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