Iron block steel hardness test case

1) Sample: Material is tool steel, thickness 2.6mm, 2.9mm, 3mm

2) Requirements: Test the Rockwell hardness value of tool steel samples

3) Test equipment and environment

Because tool steel and heat-treated structural steel have high hardness, Rockwell hardness test generally adopts HRC scale, Rockwell diamond indenter, and the test force is 150kgf. The R-150DT digital Rockwell hardness tester of Ebisu company used in this test, test Rockwell block 65.5HRC, the average value of five tests is 65.3HRC, the error is 0.2HRC, which proves that the accuracy of the machine is within the allowable error of the national standard Within the range, the sample can be tested normally. Laboratory test temperature: 32℃, humidity 46%

Rockwell Hardness Tester R-150DT

Rockwell hardness indication value allowable error and indication value repeatability

Ruler	Hardness range of standard block	Permissible error of hardness meter	Repeatability of the displayed value allowed by the hardness tester a
A	20~≤75HRA	±2HRA	≤0.02 (100－H) Or 0.8 Rockwell unit b
	＞75~≤88HRA	±1.5HRA
B	20~≤45HRB	±4HRB	≤0.04 (130－H) Or 1.2 Rockwell unit b
	＞45~≤80HRB	±3HRB
	＞80~≤100HRB	±2HRB
C	20~≤70HRC	±1.5HRC	≤0.02 (100－H) Or 0.8 Rockwell unit b
a: where H is the average hardness value b: subject to the larger value

4) Test data

machine type	Sample	Ruler HRC	Test 1	Test 2	Test 3	Test 4	Test 5	average value
R-150DT	1	150kgf	60.2	60.6	60.4	60.4	60.5	60.4
	2	150kgf	61.8	62.1	61.8	61.9	61.8	61.9
	3	150kgf	63	63.1	62.9	63	63.6	63.1

5) Data analysis:

It can be seen from the above test results:

The average hardness values ​​of R-150DT on the three samples are 60.4HRC, 61.9HRC and 63.1HRC respectively

The maximum deviation of sample 1 is 0.4HRC, the maximum deviation of sample 2 is 0.3HRC, and the maximum deviation of sample 3 is 0.7HRC

6) Summary

The digital Rockwell hardness tester R-150DT has the test scales of all standard Rockwell hardness testers. The standard configuration is equipped with 1.5875mm cemented carbide ball indenter and Rockwell diamond indenter. The machine has a hardness conversion scale, and the test results can be directly converted. It is the hardness value of Vickers and Brinell. The indenter has an anti-collision protection device; equipped with a USB interface, the test data can be directly stored in the U disk in Excel format, which is convenient for data transmission and long-term storage. For the hardness test of thin steel plate, surface hardened steel, heat-treated structural steel, tool steel, hard metal and cemented carbide, you can choose our Rockwell hardness tester for testing.