Symbols and description ……………………………………………………………………………. 7
Test equipment…………………………………………………………………………………………. 9
Samples…………………………………………………………………………………………………. 10
Test procedures………………………………………………………………………………………. 11
Uncertainty of results………………………………………………………………………………. 13
Test report……………………………………………………………………………………………… 14 Appendix A (Normative appendix) Minimum Sample Relationship of Thickness-Test force-Hardness…………………………………………………………………………………………… 15 Appendix B (Normative appendix) Correction factor table available in examination on curved face……………………………………………………………………………………………. 17 Appendix C (Normative appendix) Routine inspection on sclerometer conducted by user ………………………………………………………………………………………………………….. 21 Appendix D (Normative appendix) Measurement uncertainty of hardness value ….. 22 GB/T 4340.1—2009 Preface GB/T 4340 Metallic materials — Vickers Hardness Test is categorized into the following four parts: — Part 1: Test method — Part 2: Inspection and Calibration — Part 3: Specification of standard hardness block — Part 4: Vickers hardness value table This section indicates to GB/T 4340 Part 1. Modification of this section refers to ISO 6507-1, 2005 Metallic materials — Vickers Hardness Test Part 1: Test Method (English version). In view of the actual situation in China, this section undergoes due modification and supplementation upon second draft in reference to ISO 6507-1, 2005. Technical difference was marked in the margins of terms involved with vertical single line. This section is substantially equivalent to the ISO 6507-1, 2005 in terms of structure and technology-related content. However, in consideration of national condition in China, the following aspects are modified: — Preface of ISO 6507-1, 2005 is deleted. — “This International Standard” is changed into “This section”. — The coma “,” used as decimal point “.” is replaced by the latter. — Instruction on test force of Micro Vickers Hardness is added. — Instruction on time error controlled in test force of special materials is added. — Measurement uncertainty of hardness value in Appendix D of original ISO 6507-1, 2005 is modified. This section is substituted for GB/T 4340.1—1999 Metallic materials — Vickers Hardness Test Part 1: Test Method. Modifications go to the following contents compared with original standards. — Requirement for diagonal in the field of view under lens is added; — Planar Vickers hardness Table of GB/T 4340.1—1999 Metallic materials — Vickers Hardness Test Part 1: Test Method is separately named as Metallic materials – — Vickers Hardness Test Part 4: Hardness value Table; — Instruction for uncertainty of results is added; — Informative Appendix D (measurement uncertainty of hardness value) is added. In this section, Appendixes A and B are normative; Appendixes A and B are informative. This section is proposed by China Iron and Steel Association. Thissection undergoes centralized management by National Steel Standardization Technical Committee. This section is drafted by units including Iron and Steel Research Institute, Shougang Corporation Technology Research Institute, Metallurgical Industry Information Standards Institute and Shanghai Materials Institute. This section is drafted by individuals including Ying Li, Jingang Shi, Yifei Gao, Weiping Liu, Li Dong and Bin Wang. Historical release versions of standards substituted by this section: — GB/T 4340 —1984, GB/T 4340.1—1999. GB/T 4340.1—2009 Metallic materials — Vickers Hardness Test Part 1: Test Method
Scope This section of GB/T 4340 specifies Vickers Hardness Test in terms of principle, symbols and description, test equipment, samples, test procedures, uncertainty of results and test report. This section stipulates measurement methods of metallic Vickers hardness test in conformity with three scopes of test force (See Table 1).
