GB/T 33965-2017 in English

Standard formulation background and technology evolution analysis

This standard is managed by the National Technical Committee for Steel Standardization, and the main drafting units include Wuhan Iron and Steel Co., Ltd. and other leading companies in the industry. The background of its formulation is to unify the terminology and methods for measuring thinning rate in tensile tests of metal materials to ensure the accuracy and comparability of data.

Test equipment and measurement requirements

• Tensile testing machines must comply with GB/T16825.1 standards and have an accuracy of Class 1 or higher.
• The resolution of the thickness measuring device shall not be less than 0.001mm, and the width measurement shall not be less than 0.01mm.
• It is recommended to use automatic measurement methods to ensure the accuracy and efficiency of data collection.

Implementation suggestions

In practical applications, it is recommended to:

1. Select specimens strictly in accordance with the standards to ensure their representativeness.
2. Preferably use automatic measurement methods (such as extensometers) to improve test efficiency and accuracy.
3. For the determination of post-fracture thinning rate, it is recommended to use high-precision measurement tools and record data discreteness.
4. Detailedly indicate the method used and its applicable conditions in the test report.