[ASTM] ASTM E18, ISO 5608 - Standard Test Methods for Rockwell Hardness of Metallic Materials
Writer : 관리자(salt@light-salt.kr) Date : 21.12.17 Hit : 635
Tags : ASTM E18,ISO 5608,Rockwell hardness test,HRC,HRB,HRA,HR Value
Attachments :
Rockwell Hardness Test
ASTM E18 - Standard Test Methods for Rockwell Hardness of Metallic Materials
ISO 5608 - Metallic materials - Rockwell hardness test
Standard
Both the ASTM E18 and ISO 6508 follow the same testing methods and values/calculations for HR values. To simplify things, we will be referring to ASTM E18 in any following information. The standards cover a wide range of metallic material and hardness test information such as measurement, terminology, classifcations and testing methods.
ASTM E18: Fig. 1. Rockwell hardness test method (Schematic Diagram)
Application
Rockwell hardness tests are done to test the hardness of metallic materials. The test is done by applying a force of 60, 100 or 150kgf on a specimen and measuring its indent depth.
ASTM E18: 5.1.2 Indenters for Rockwell hardness test include a diamond spheroconical indenter and tungsten carbide ball indenters of specified diameters
ASTM E18: Table 1. Rockwell Hardness Scales
There are 5 types of indenters: Diamond cone indenter, 1/16" (1.588mm) ball, 1/8" (3.175mm) ball, 1/4" (6.35mm) ball and the 1/2" (12.7mm) ball. With the 5 indenters and 3 loading forces we get the Rockwell hardness scales. The Rockwell hardness scale is divided into 15 types HRB, HRC, HRA, HRD, HRE, HRF, HRG, HRH, HRK, HRL, HRM, HRP, HRR, HRS, HRV. These 15 types of scales cover Copper alloys, softsteels, aluminum alloys, iron, steel, cemeted carbides, thin steel, pearlitic malleable iron, cast iron, aluminum, bearing metals, thin soft sheet metals, zinc, lead etc.
Equipment
Salt Co., Ltd.'s ST-HR150D Rockwell Hardness Tester is equipped with a touch screen indicator that is programmed to be able to measure all 15 scales. All scales are covered and force/indentor information is neatly displayed for ease of use. The semi automated testing process makes repeated hardness testing efficient.