This standard specifies the test method for determining the wear amount and friction coefficient of metallic materials under sliding friction conditions using the "ring-block" contact configuration. The core principle involves subjecting the test ring and test block to continuous wear under specified load, rotational speed, and lubrication conditions. The wear performance of the material is evaluated by measuring the wear scar width or mass loss generated on the test block. Performing this test requires a dedicated ring-block wear testing machine, along with a measurement microscope of sufficient precision to accurately measure the wear scar width. Additionally, a balance is needed to weigh the mass before and after wear to calculate the wear amount. Although this method primarily targets metallic materials, it can also be applied to comparative friction and wear performance tests for other materials.