We would like to show you a description here but the site wont allow us. a b c in asme gradeAug 23, 2017 · ASTM and ASME pipe designations for grades of steel are very similar. For example, A106 B is a spec published by ASTM (the ASME spec would be SA106 B). The A designates a ferrous material. 106 is an arbitrary number that designates it as a seamless carbon steel pipe suited for high-temperature service.