在计量领域中 ,量块是长度计量传递基准 ,量块的尺寸稳定性是量块的重要性能指标。近 5 0年来 ,量块的尺寸稳定性问题始终困扰着人们 ,目前国内最佳水平为 10 0ｍｍ长度年变化量为 10万分之几毫米。我们经过多年实践 ,开发出量块渗氮淬火复合热处理工艺 ,使量块尺寸稳定在 10 0 In the field of metrology, the gauge is the basis for the length measurement transfer, and the dimensional stability of the gauge is an important performance indicator of the gauge. In the recent 50 years, the problem of the dimensional stability of the measuring block has always plagued people. At present, the optimum level in China is a few millimeters of annual variation of 10 mm in length. After years of practice, we developed a number of nitriding quenching heat treatment process, so that the size of the block stable at 100