GB/T 221-2000 is a Chinese standard for the testing of metallic materials. It outlines the requirements for testing including tensile strength, yield strength, plastic strain limit, stress-strain curve form, and other necessary parameters. The standard aims to ensure that testing results are accurate and reliable, providing manufacturers and consumers with assurance of product quality.
To guarantee the testing is done accurately, all material samples must conform to the GB/T 221-2000 standard. Specific requirements are as follows:
The specimens must be prepared by machining and heat treatment in accordance with the prescribed process.
The specimens must be subjected to a thorough mechanical surface-cleaning prior to testing, in order to eliminate any surface flaws.
The specimens must be of uniform size and shape, and fit snugly into the testing apparatus.
The specimens must be inspected for flaws, cracks or other non-metallic inclusions before testing.
Testing must be done with calibrated testing apparatus and under the strictest possible conditions, as per the specifications provided in the standard.
The precision of the testing apparatus must meet the requirements for test accuracy stipulated by the standard.
The requirements for test accuracy, as outlined by the standard, are met when the test result is within a range of ± 5%.
In addition, the standard requires that the results be carefully documented and reported. All the relevant data must be accurately recorded and verified on the test report.
The aim of GB/T 221-2000 is to provide an adopter of this standard with the necessary information to ensure accurate and reliable testing results for metallic materials. The implementation of the standard will help to guarantee product quality and provide manufacturers and consumers with the assurances needed for peace of mind.
