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GB/T 15970.7-2017 PDF English

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GB/T 15970.7-2017: Corrosion of metals and alloys -- Stress corrosion testing -- Part 7: Slow strain rate testing
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GB/T 15970.7: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 15970.7-2017150 Add to Cart Auto, 9 seconds. Corrosion of metals and alloys -- Stress corrosion testing -- Part 7: Slow strain rate testing Valid
GB/T 15970.7-2000439 Add to Cart 3 days Corrosion of metals and alloys. Stress corrosion testing. Part 7: Slow strain rate testing Obsolete

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GB/T 15970.6   GB/T 15970.4   GB/T 15970.3   GB/T 20854   

GB/T 15970.7-2017: Corrosion of metals and alloys -- Stress corrosion testing -- Part 7: Slow strain rate testing


---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT15970.7-2017
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.060 H 25 Replacing GB/T 15970.7-2000 Corrosion of metals and alloys - Stress corrosion testing - Part 7. Slow strain rate testing (ISO 7539-7.2005, MOD) Issued on: OCTOBER 14, 2017 Implemented on: JULY 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC.

Table of Contents

Foreword ... 3 Introduction ... 6 1 Scope ... 7 2 Normative references ... 7 3 Terms and definitions ... 7 4 Principles ... 9 5 Specimens ... 9 6 Reagents ... 9 7 Test procedure ... 10 8 Evaluation of results ... 12 9 Test report ... 15 Appendix A (Informative) Strain rate ... 17

Foreword

GB/T 15970 “Corrosion of metals and alloys - Stress corrosion test” is divided into the following parts. - Part 1. General guidance on testing procedures; - Part 2. Preparation and use of bent-beam specimens; - Part 3. Preparation and use of U-bend specimens; - Part 4. Preparation and use of uniaxially loaded tension specimens; - Part 5. Preparation and use of C-ring specimens; - Part 6. Preparation and use of pre-fractured specimens; - Part 7. Slow strain rate testing; - Part 8. Preparation and use of specimens to evaluate weldments; - Part 9. Preparation and use of pre-fractured specimens for tests under rising load or rising displacement. This part is the part 7 of GB/T 15970. This part was drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 15970.7-2000 “Corrosion of metals and alloys - Stress corrosion testing - Part 7. Slow strain rate testing”. As compared with GB/T 15970.7-2000, the main technical changes are as follows. - MODIFY the normative references; - ADD the definition of plastic strain to failure; - MODIFY the definition of elongation to fracture, reduction of area, strain rate; - ADD the descriptions for the number of specimens in each group; - ADD the requirements for reagents; - DELETE the description that “If the total test time of the test at a very slow strain rate is required, it is needed to preload the specimen”; - ADD the description of important parameters of environmental factors; - ADD the descriptions for the factors which affect the potential of the metal electrode; - ADD the provisions for the auxiliary electrodes that generate external currents; - ADD the requirements for the ratio of solution volume to specimen’s surface area; - ADD the sensibility of the use of plastic strain to failure to assess the stress- corrosion-fracturing; - ADD the descriptions for testing the plastic strain to failure; - ADD the expression formula of the plastic strain to failure and the limitations of the use of the formula; - MODIFY the method of determining the critical stress or strain value; - ADD the description of the test results; - DELETE the contents of the original Appendix A; - CHANGE the original Appendix B into Appendix A. This part uses the redrafting methods to modify and adopt the ISO 7539-7.2005 Corrosion of metals and alloys - Stress corrosion testing - Part 7. Method for slow strain rate testing. As compared with ISO 7539-7.2005, this part has structural changes and adds the clause 6. The technical differences between this part and ISO 7539-7.2005 and their reasons are as follows. - ADJUST the relevant standards in the normative references, to adapt to Chinese technical documents (see clause 2); - MODIFY the definition of elongation to fracture, reduction of area, strain rate, post-break elongation, part shrinkage and strain rate, to be consistent with the definition given in GB/T 228.1-2010 (see clause 3); - ADD the descriptions for the number of specimens per group, to clarify the number of specimens and reduce the risk of use (see clause 5); - ADD the requirements for the reagents, to provide a reproducible chemical environment, thereby ensuring the consistent test results (see clause 6); - ADD the requirements for the ratio of solution volume to specimen’s surface area, to ensure that the specimen is exposed to sufficient corrosive solution Corrosion of metals and alloys - Stress corrosion testing - Part 7. Slow strain rate testing

1 Scope

This part of GB/T 15970 specifies a slow strain rate test procedure, for studying the susceptibility of metals and alloys to stress-corrosion-fracturing, including hydrogen-induced failure. The term “metal” as used in this part also includes alloys. This part applies to boards, rods, wires, belts, tubes and their welded assemblies.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 15970.1 Corrosion of metals and alloys - Stress corrosion testing - Part 1. General guidance on testing procedures (GB/T 15970.1-1995, idt ISO 7539-1.1987) GB/T 15970.4 Corrosion of metals and alloys - Stress corrosion testing - Part 4. Preparation and use of uniaxially loaded tension specimens (GB/T 15970.4-2000, idt ISO 7539-4.1989) GB/T 15970.6 Corrosion of metals and alloys - Stress corrosion testing - Part 6. Preparation and use of pre-fractured specimens for tests under constant load or constant displacement (GB/T 15970.6-2007, ISO 7539-6.2003, IDT)

3 Terms and definitions

The terms and definitions as defined in GB/T 15970.1 as well as the following terms and definitions apply to this document. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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