Metallic materials Tensile testing at ambient temperature

Transcription

1 Translated English of Chinese Standard: GB/T ICS H 22 National Standard of the People's Republic of China GB GB/T eqv ISO 6892:1998 Metallic materials Tensile testing at ambient temperature 金属材料 室温拉伸试验方法 Issued on: March 10, 2002 Implemented on: July 1, 2002 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Page 1 of 53

2 Table of Contents Foreword... 4 ISO Foreword Scope Normative references Principle Definitions Symbols and designations Test piece Determination of original cross-sectional area (So) Marking the original gauge length (Lo) Accuracy of testing apparatus Conditions of testing Determination of percentage elongation after fracture (A) and percentage total elongation at fracture (At) Determination of percentage total elongation at maximum force (Agt) and percentage non-proportional elongation at maximum force (Ag) Determination of percentage yield point extension (Ae) ] Determination of upper yield strength (ReH) and lower yield strength (ReL) ] Determination of proof strength, non-proportional extension (Rp) Determination of proof strength, total extension (Rt) Method of verification of permanent set strength (Rr) Determination of tensile strength (Rm) ] Determination of percentage reduction of area (Z) Rounding off of numerical values of property determination results ] Accuracy of property determination results Processing of test results ] Page 2 of 53

3 23 Test report Annex A Annex B Annex C Annex D Annex E Annex F Annex G Annex H ] Annex I ] Annex J Annex K Annex L ] Page 3 of 53

4 Foreword This Standard adopts and is equivalent to the International Standard ISO 6892:1998 Metallic materials-tensile testing at ambient temperature. The main technical content of this Standard is the same as that of ISO 6892:1998. However, some of the technical content in this Standard is more detail and specific; and the compilation structure does not correspond exactly. Requirements to rounding off of numerical values of property determination results and processing of test results are added. Add type of test sample. Annex F (informative) Nomogram for calculating the original gauge lengths of test pieces of rectangular cross-section is deleted. Annex L (informative) Bibliography is deleted. Annex H (informative) Determination of proof strength (non-proportional extension) (R p ) using step-by-step approach is added. Annex L (informative) Comparison between names and symbols of properties in new and old standards is added. This Standard incorporates and revises the former national standards GB/T Standard Test Methods for Tension Testing of Metallic Materials, GB/T Standard Test Methods for Tension Testing of Metallic Thin Sheets (Strips) and GB/T Test Pieces for Tension Testing of Metallic Materials. Major changes and supplements have been made to the technical contents of the former standards in the following sections: - Normative references; - Definitions and symbols; - Test piece; - Conditions of testing; - Performance measurement methods; - Rounding off of numerical values of property determination results; - Statements of accuracy of property determination results. This Standard shall replace GB/T Standard Test Methods for Tension Testing of Metallic Materials, GB/T Standard Test Methods for Tension Testing of Metallic Thin Sheets (Strips) and GB/T Test Pieces for Tension Testing of Metallic Materials, from the effective date of this Standard. Annexes A to D form an integral part of this Standard. Annexes E to L of this Standard are for information only. This Standard was proposed by former State Bureau of Metallurgical Industry. This Standard shall be under the administration of National Steel Standardization Technical Committee. Drafting organizations of this Standard: China Iron & Steel Research Institute Group, Jinan Shijin Group Corporation, Baoshan Iron & Steel Co., Ltd., and China Metallurgical Information and Standardization Research Institute. Drafters of this Standard: Liang Xinbang, Li Jiulin, Tao Liying, Li Heping, and Gao Zhenying. This Standard was released first-time in November 1963; revised for the first time in Page 4 of 53

5 September 1976; and revised for the second time in February Page 5 of 53

6 ISO Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electro-technical Commission (IEC) on all matters of electro-technical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 6892 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC1, Uniaxial testing. This second edition replaces the first edition (ISO 6892:1984). Annexes A to D form an integral part of this International Standard. Annexes E to L are for information only. Page 6 of 53

7 National Standard of the People's Republic of China GB/T eqv ISO 6892:1998 Metallic materials - Tensile testing at ambient temperature Replacing GB/T GB/T GB/T Scope This Standard specifies the principle, definitions, symbols and designations, test piece and its dimension measurement, testing apparatus, conditions of testing, property determination, rounding off of numerical values of determination results, and test report for tensile testing of metallic materials. This Standard applies to determination of tensile properties of metallic materials at ambient temperature. Whereas, the tensile testing for the metallic products with a small cross section dimension such as metal anchors, ultra-fine wires and capillary tubes requires separate agreement. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. GB/T Steel and steel products--location and preparation of test pieces for mechanical testing (eqv ISO 377:1997). GB/T Rules for rounding off of numerical values. GB/T Calibration of extensometers used in uniaxial testing (idt ISO 9513:1999). GB/T Verification of tensile testing machines (idt ISO :1986). GB/T Steel--Conversion of elongation values--part 1: Carbon and low alloy steels (eqv ISO :1984). GB/T Steel--Conversion of elongation values--part 2: Austenitic steels (eqv ISO :1984). 3 Principle The test involves straining a test piece by tensile force, generally to fracture, for the purpose of determining one or more of the mechanical properties defined in clause 4. The test is carried out at ambient temperature between 10 C and 35 C, unless otherwise specified. Tests carried out under controlled conditions shall be made at a temperature of 23 C±5 C. Page 7 of 53