GB/T 43432.1-2025 "Metallic Materials - Barcol Hardness Test - Part 1: Test Method" is a national standard that specifies the method for Barcol hardness testing of metallic materials. This standard is applicable to measuring metallic materials equivalent to a Vickers hardness range of 20 HV to 145 HV. It describes the test principle, equipment, specimens, procedures, and reporting requirements. The core principle involves using a Barcol hardness tester, where a steel indenter is pressed into the surface of the specimen under the force of a spring, and the hardness value is calculated based on the depth of penetration. The primary testing instrument used in the implementation of this standard is the Barcol hardness tester, which must comply with the inspection and calibration requirements specified in GB/T 43432.2 to ensure the accuracy and consistency of test results.