灰铸铁件,尤其是大型灰铸铁件的硬度测定,由于部件较大,一般硬度计难以适用,如机床导轨面淬火前后的硬度测定。目前,有少数单位使用进口的数显硬度计,众多的中小企业,甚至大厂多采用国产D型肖氏硬度计或便携式洛维硬度计或国产里氏硬度计、超声硬度计等。但不管采用那类硬度计,测量结果应该统一,必须符合有关技术条件或技术标准的规定,这样就存在着硬度 Gray cast iron, especially large gray cast iron hardness determination, due to larger components, the general hardness is difficult to apply, such as the hardness of the rail surface before and after quenching. At present, a small number of units using imported digital hardness tester, many small and medium enterprises, and even manufacturers use more domestic D-type Shore hardness tester or portable Lowe hardness tester or domestic Leeb hardness tester, ultrasonic hardness tester. However, regardless of the type of durometer, the measurement results should be uniform and must comply with the relevant technical conditions or technical standards, so that there is hardness