China Rockwell hardness Tester HR-150A

A Brief Introduction to the Hardness TesterThe hardness is one of the important criteria of the mechanical functions of the materials, and the hardness test is the important means to judge the quality of the metallic materials or parts. As the metallic hardness has mutual correspondent relations with other mechanical functions, the majority of the metallic materials can calculate the other mechanical functions such as the strength, the fatigue, the evolutionary change and the degree of being worn out can be approximately inferred from the hardness shown by the test.The manual Rockwell hardness fester is a popularly-used hardness testing instrument to measure the Rockwell hardness of the materials. The speed of loading the test force is regulated by the buffer whereas the change of the test force is made by rotating the carriage-changing hand-wheel. The operation of the present instrument is simple, its functions are stable, and its use is, therefore, widely spread.
Technical Parameters of the Hardness Tester
2.1 The initial test force: 98.07N(10kg), the allowed tolerance: ±2.0%
2.2 The Total Test force: 588.4N(60kg), 980.7N(100kg), 1471N(150kg), the allowed tolerance: ±1.0%
2.3 The specifications of the indenter:
2.3.1 Diamond Rockwell indenter
2.3.2 ∮1.5875mm Ball indenter
2.4 The max height of the specimens: 175mm
2.5 The distance from the center of the indenter to the instrument body: 165mm
2.6 Overall dimension (lengthxwidthxheight): 525x210x700(mm)
2.7 The total weight of the tester: 78kg or so.
2.8 The allowed tolerances of the indicated values of the hardness tester (Table 1)
Table 1

Hardness ScaleHardness Range of the Standard BlocksMax Tolerance of the Indicated ValuesHRA(20~75)HRA±2HRA(>75~88)HRA±1.5HRAHRB(20~45)HRB±4HRB(>45~80)HRB±3HRB(>80~100)HRB±2HRBHRC(20~70)HRC±1.5HRCHRD(40~70)HRD±2HRD(>70~77)HRD±1.5HRDHRE(70~90)HRE±2.5HRE(>90~100)HRE±2HREHRF(60~90)HRF±3HRF(>90~100)HRF±2HRFHRG(30~50)HRG±6HRG(>50~75)HRG±4.5HRG(>75~94)HRG±3HRGHRH(80~100)HRH±2HRHHRK(40~60)HRK±4HRK(>60~80)HRK±3HRK(>80~100)HRK±2HRK