What is the decarburization and carburizing test of the socket button head self tapping screw?
What is the decarburization and carburizing test of the socket button head self tapping screw? The test requirements for socket button head self tapping screw generally include chemical analysis of raw materials, tensile strength and other performance tests, hardness tests, grain size tests, brittle fracture tests, decarburization and carburizing tests. And Shi Shi Tong mainly talks about the decarburization and carburizing test of the socket button head self tapping screw : 1) Sampling, sample: Take a longitudinal section of the sample along the center line of the socket button head self tapping screw . After the sample is taken, it is embedded in the resin powder, and the sample is fixed by heating. Then, the surface of the sample was ground and polished, and the surface of the sample was etched with a 3% nitrate solution to meet the test requirements. 2) Metallographic microscopy: A sample that meets the requirements is placed under a metal...