N a measure of the hardness of a material obtained by pressing a hard steel ball into its surface; it is expressed as the ratio of the load on the ball in kilograms to the area of the depression made by the ball in square millimetres 勃氏硬度数
Brinell l hardness number布氏硬度数
BHN Brinell Hardness Number布氏硬度值
N（名词） a measure of the hardness of a material obtained by pressing a hard steel ball into its surface; it is expressed as the ratio of the load on the ball in kilograms to the area of the depression made by the ball in square millimetres 勃氏硬度数