China Digital Rockwell Hardness Tester HRS-150

A Brief Introduction to the Hardness TesterHardness is one of the important mechanic characteristics of the material while the hardness testing is an important method to judge the quality of the metal material or its component parts. The hardness of the metal is correspondent to its other mechanic characteristics, and so its mechanic characteristics such as the strength, tiredness, wriggling and wearing out can be tested out approximately through its hardness testing.The Digital Rockwell Hardness Tester is equipped with a newly-designed large displaying screen with good reliability, excellent operation and easy watching, thus it is a high-tech product combining the mechanic and electric features. Its main function is as follows:2.2.1 The selection of all Rockwell hardness scales;
2.2.2 The hardness values exchange among various hardness scales;
2.2.3 The selection of dwell time for hardness test;
2.2.4 The revising of the value for year, month and date;
2.2.5 The RS232 serial communication is supplied to clients for the functional expansion;
2.2.6 The Present hardness tester with the storage function can be browsed the hardness testing page and output the hardness testing results with printer.




III. The Technical Specifications of the Hardness Tester
3.1 Test force and scales of Rockwell hardness:

Rockwell HardnessTest ForceInitial Test Force(N)98.07(10kg)Tolerance±2.0%Total Test Force(N)588.4(60 kg)Tolerance±1.0%980.7(100 kg)1471(150kg)IndenterDiamond Cone IndenterФ1.5875mm Ball IndenterScaleHRAHRBHRCHRDHREHRFHRGHRHHRRHRMHRPHRSHRKHRLHRV

Table.3-1


3.2 The allowed tolerances and repeatability of Rockwell hardness displaying values:

ScalesHardness Range of the Standard Hardness BlocksAllowed Tolerance of Displaying ValueAllowed Repeatability of Displaying Value aA(20~≤75)HRA±2HRA≤0.02(100-H)
or 0.8 Rockwell unit b(>75~≤88) HRA±1.5HRAB(20~≤)45HRB±4HRB≤0.04(130-H)
or 1.2 Rockwell unit b(>45~≤80)HRB±3HRB(>80~≤100)HRB±2HRBC(20~≤70)HRC±1.5HRC≤0.02(100-H)
or 0.8 Rockwell unit ba:H means average hardness value b:select a larger value

Table.3-2



3.3 The scales, indenters, test force values of Rockwell hardness tests and examples of application:

ScaleIndenterInitial Test Force(N)Total Test Force
(N)Examples of ApplicationsHRADiamond Indenter98.07
(10kg)588.4(60kg)Hard metal and hard alloyHRD980.7(100kg)Steel sheet, surface-quenched steelHRC1471(150kg)Heat treated structural steel, tool steelHRFBall Indenter
φ1.5875mm
(1/16 inch)588.4(60kg)Non-ferrous metalsHRB980.7(100kg)Non-ferrous metals; soft metalsHRG1471(150kg)Pearlite iron, copper, nickel, zinc alloyHRHBall Indenter
φ3.175mm
(1/8 inch)588.4(60kg)annealed copper alloyHRK1471(150kg)Non-ferrous metals, hard plasticsHRE980.7(100kg)Aluminum and aluminum alloyHRLBall Indenter
φ6.35mm
(1/4 inch)588.4(60kg)
HRM980.7(100kg)HRP1471(150kg)HRRBall Indenter
φ12.7mm
(1/2 inch)588.4(60kg)
HRS980.7(100kg)HRV1471(150kg)

The normally used Rockwell hardness scales are A, B, C 3 kinds.
Table.3-3

3.4 The Power Source and the Voltage: AC220V±5%, 50-60 Hz
3.5 Time-delayed control: 0~60 seconds, adjustable
3.6 The Max. Height of the Testing Specimen: 175 mm
3.7 The Distance from the Indenter Center to the Instrument Body: 165mm
3.8 The Overall Dimension of the Hardness Tester (Length x Width x Height):
525x215x700mm
3.9 The Net Weight of the Tester: 78kg (Approx).