China Superficial Rockwell Hardness Tester TIME HRM-45

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.The manual Superficial 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: 29.42N (3kg), the allowed tolerance: ±2.0%
2.2 The Total Test force: 147.1N (15kg), 294.2N (30kg), 441.3N (45kg), the allowed tolerance: ±1.0%
2.3 The specifications of the indenter:
2.3.1 Diamond Rockwell indenters
2.3.2 Ball indenters φ1.5875mm
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 The total dimension of the tester (length x width x height): 525x210x730 (mm)
2.7 The total weight of the tester: 78kg.
2.8 The allowed tolerances of the indicated values of the hardness tester (Table 1)
Table 1

ScaleHardness of Standard BlocksDisplay Tolerance15N(70~94) HR 15N±2 HRN30N(42~86) HR 30N45N(20~77) HR 45N15T(67~93) HR 15T±3 HRT30T(29~82) HR 30T45T(10~72) HR 45T

The Scales, Indenters, Test Force Values and Application Fields of the Superficial Rockwell Hardness Tests. (Table 2)
Table 2

ScaleIndenter TypeInitial Test ForceTotal Test Force(N)ApplicationsHR15NDiamond Indenter29.42 N
(3kg)147.1(15)Hard alloy steel, nitride steel, carburized steel, various heavy steel plate, etcHR30N294.2(30)Surface-quenched steel, carburized steel, knife, thin steel plate, etcHR45N441.3(45)Quenched steel, tempered steel, hard cast iron and edge of parts, etcHR15TBall Indenter φ1.5875mm(1/16 inch)147.1(15)Annealed copper alloy, brass,bronze plate, mild steel sheetHR30T294.2(30)Mild steel sheet, aluminum alloy, copper alloy, brass and bronze, malleable cast iron,HR45T441.3(45)Pearlite iron, copper -nickel alloy and zinc-nickel alloy plate