洛氏硬度测试(HRC）www.tool-tool.com

Bewise Inc. www.tool-tool.com Reference source from the internet.

实验步骤及方法：

1）选定压头及载荷按表1-2选择测量规范。

2）试样应平整、无油污、无氧化物及明显加工痕迹。

3）试样厚度不小于压入深度的十倍。

4）打硬度点处两相邻压痕及压痕离试样边缘之距不小于3mm。

5）加预载荷。

6）加载荷（150kg），保载荷15-20秒后卸载。

7）卸载后在洛氏硬度计上直接读HRC数值。

实验图象说明：

布洛维硬度计
　

洛氏硬度计算公式：



式中:

h1：为预加载荷压入试样的深度（mm）。

h3：为卸除主载荷后压入试样的深度（mm)。

k：为常数（1200金刚 石圆锥 k=0.2；钢球时 HRB k=0.26 ）

　

氏硬度计算公式： 式中: h1：为预加载荷压入试样的深度（mm）。 h3：为卸除主载荷后压入试样的深度（mm)。 k：为常数（1200金刚 石圆锥 k=0.2；钢球时 HRB k=0.26 ）
	读数说明（左）

上图静态说明:

符合 压头 负荷kgf 硬度只值的范围 使用范围
HRA 1200金刚石圆锥 60

>70
测硬度合金、 淬火层、渗碳层、气化层等零部件
HRB Ф2.5或Ф5钢球 100

25--100

(HB60-230)
测有色金属、退火、正火、回火等零部件
HRC 1200金刚石圆锥 150

20-67

(HB230-700)
测调质钢、 淬火钢等零部件

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