出典:Wikipedia
出典:『Wikipedia』 (2011/07/10 06:35 UTC 版)
The Rockwell scale is a hardness scale based on the indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload. There are different scales, denoted by a single letter, that use different loads or indenters. The result is a dimensionless number noted as HRX, where X is the scale letter.