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MRC MH180, User Manual

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MRC MH180 User Manual Download Page 19

Table 2 

No.

Material

HLD

Strength 

σ

b

(MPa) 

1 Mild 

steel  350

～

522 374

～

780 

2 High-Carbon 

steel  500

～

710 737

～

1670 

3 Cr 

steel  500

～

730 707

～

1829 

4 Cr-V 

steel  500

～

750 704

～

1980 

5 Cr-Ni 

steel  500

～

750 763

～

2007 

6 Cr-Mo 

steel  500

～

738 721

～

1875 

7 Cr-Ni-Mo 

steel  540

～

738 844

～

1933 

8 Cr-Mn-Si 

steel  500

～

750 755

～

1993 

9 

Super strength steel 

630

～

800 1180

～

2652 

10 Stainless 

steel  500

～

710 703

～

1676 

Table 3 

Type of impact device 

DC(D)/DL 

D+15 

C 

G 

E 

Impacting energy 

Mass of impact body 

11mJ 

5.5g/7.2g 

11mJ 

7.8g 

2.7mJ 

3.0g 

90mJ 

20.0g 

11mJ 

5.5g 

Test tip hardness: 

Dia. Test tip: 

Material of test tip: 

1600HV 

3mm 

Tungsten 

carbide 

1600HV 

3mm 

Tungsten 

carbide 

1600HV 

3mm 

Tungsten 

carbide 

1600HV 

5mm 

Tungsten 

carbide 

5000HV 

3mm 

synthetic 

diamond 

Impact device diameter: 

Impact device length: 

Impact device weight: 

20mm 

86(147)/ 

75mm 

50g 

20mm 

162mm 

80g 

20mm 

141mm 

75g 

30mm 

254mm 

250g 

20mm 

155mm 

80g 

Max. hardness of 

sample 

940HV 940HV 1000HV  650HB 1200HV 

Mean roughness value 

of sample surface Ra: 

1.6

μ

m 1.6

μ

m 0.4

μ

m 6.3

μ

m 1.6

μ

m 

Min. weight of sample: 

Measure directly 

Need support firmly 

Need coupling tightly 

>5kg 

2

～

5kg 

0.05

～

2kg 

>5kg 

2

～

5kg 

0.05

～

2kg 

>1.5kg 

0.5

～

1.5kg 

0.02

～

0.5kg

>15kg 

5

～

15kg 

0.5

～

5kg 

>5kg 

2

～

5kg 

0.05

～

2kg 

Min. thickness of sample 
Coupling tightly 
Min. layer thickness for 

5mm 

5mm 

1mm 

10mm 

5mm 

18

Summary of Contents for MH180

Page 1: ...MH180 Leeb Hardness Tester User s Manual Hagavish st Israel 58817 Tel 972 3 5595252 Fax 972 3 5594529 mrc mrclab com MRC 7 14 PLEASE READ THIS MANUAL CAREFULLY BEFORE OPERATION ...

Page 2: ...n 8 3 2 Impact Device Selection 9 3 3 Preparation of the Sample Surface 9 4 Testing Program 10 4 1 Start Up 10 4 2 Loading 10 4 3 Localization 10 4 4 Testing 10 4 5 Read Measured Value 11 4 6 Notification 11 5 Operation Detail 12 5 1 Power On Off 12 5 2 Material Setting 12 5 3 Hardness Strength testing 13 5 4 Impact Direction Setting 13 5 5 Average Times Setting 13 5 6 Data logging 13 5 6 1 Viewin...

Page 3: ... Impact Device Maintenance 16 6 2 Instrument Maintenance Program 16 6 3 Fault Analysis Evacuation 16 6 4 Notice of Transport and Storage Conditions 16 APPENDIX 17 Table 1 17 Table 2 18 Table 3 18 Table 4 19 ...

Page 4: ...t capacity of the battery User calibration function Software to connect to PC via RS232 port Micro printer support Compact plastic case suitable for use under poor working conditions Continuous working period of no less than 100 hours with two alkaline batteries AA size Auto power off to save energy Outline dimensions 150 74 32 mm Weight 245g 1 2 Main Application Testing Range 1 2 1 Main Applicati...

Page 5: ... 6 E 725 30HLE 508 40HLE 12 HLE 12 HLE 7 C 822 30HLC 590 40HLC 12 HLC 12 HLC Measuring range HLD 170 960 HLD Measuring direction 0 360 Hardness Scale HL HB HRB HRC HRA HV HS Display segment LCD Data memory max 100 groups relative to impact times 32 1 Working power 3V 2 AA size alkaline batteries Continuous working period about 100 hours With backlight off Communication interface RS232 1 4 Configur...

Page 6: ...humidity 90 The surrounding environment should avoid of vibration strong magnetic field corrosive medium and heavy dust 2 Structure Feature Testing Principle 2 1 Structure Feature 6 POWER 2 X 1 5V HARDNESS GAUGE 0 Steel and Cast Steel 1 Cold Work Tool Steel 2 Stainless Steel 3 Gray Cast Iron 4 Nodular Cast Iron 5 Cast Aluminum Alloys 6 Copper Zinc Alloys 7 Copper Aluminum 8 Wrought Copper 9 Wrough...

Page 7: ...e 3 Guide tube 4 Coil unit 5 Connection cable 6 Impact body 7 Support ring 2 1 2 Different Types of Impact Device DC DL C D 15 E G 2 2 Main Screen Below is the main display screen 6 Hardness Scale Average Icon Battery Info Impact Times Memory Icon Measured Value Direction ...

Page 8: ...ating the instrument memory 2 3 Keypad Definitions Table 2 1 n off the EL backlig ave or Data Delete e instrument on off l Selection ss Strength switch Up ss Scale Selection on change or Down ata Times set gging or Enter Press key to store present group of measured value into memory This operation is only valid after displaying the mean value Press key and could display single measured value Press...

Page 9: ...rd test block The error and repeatability of displayed value should be within the regulation of Appendix table 2 The instrument and impact device must be calibrated using a standard hardness block before use as the first time or having not been used for a long time or having reset the instrument system Press key meanwhile pressing down the key to power on the system Then the user calibration scree...

Page 10: ...e of sample is flat When the curvature radius R of the surface to be tested is smaller than 30mm D DC D 15 C E and DL type of impact device and smaller than 50mm G type of impact device the small support ring or the shaped support rings should be chosen The sample should have enough thickness minimum thickness of sample should conform to Table 3 For the sample with hardened layer on surface the de...

Page 11: ...sample usually need 3 to 5 times of testing operation The result data dispersion should not more than mean value 15HL The distance between any two impact points or from the center of any impact point to the edge of testing sample should conform to the regulation of Table 4 1 If want accurate conversion from the Leeb hardness value to other hardness value contrastive test is needed to get conversio...

Page 12: ...the impact device must be done during Power off Otherwise the main body could not identify the type of the impact device and it may damage the circuit board of the main body You could not save the current test value if the impact time is less than the presetting times value Only type D and type DC of impact device have the function of strength test option You can not change the setting to strength...

Page 13: ...ss testing you can select the material among the following materials Steel and Cast Steel Cold Work Tool Steel Stainless Steel Gray Cast Iron Nodular Cast Iron Cast Aluminium Alloys Copper Zinc Alloys Copper Aluminium Alloys Wrought Copper and Wrought Steel The relationship between the material number displayed on the instrument screen and the material is as follows Table 5 1 Material No Material ...

Page 14: ...verage Times Setting You could modify average times within the range of 1 to 32 as following 1 Press key in testing state The impact times item will begin to flash 2 Press or key to set the average times to the number you want 3 Press key finally to exit from the operation 5 6 Data logging At most one hundred files F00 F99 one group as one file can be stored inside the gauge By simply pressing the...

Page 15: ...n process or end of the day the user may require the readings be printed This function is only available with the mini printer Before printing please insert one connection plug of the print cable Optional parts into the socket on the up left of the main body and insert the other plug into the communication socket of the mini printer You can print out the measurement result immediately after each t...

Page 16: ...icates the more close to fill When the battery capacity runs out the battery symbol will be shown as and will begin to flash When this occurs the batteries should be replaced by a new pair Pay attention to the polarity of the batteries Please take out the batteries when not working during a long period of time 5 12 Connecting to a Computer The Instrument is equipped with a RS232 serial port Using ...

Page 17: ...sting if all the error is bigger than 2 HRC it may be the invalidation of impacted ball top caused by abrasion Changing the spherical test tip or impact object should be considered When the hardness tester appears some other abnormal phenomena please do not dismantle or adjust any fixedly assembled parts Fill in and present the warranty card to us The warranty service can be carried on 6 3 Fault A...

Page 18: ... 99 5 33 3 99 3 31 8 102 1 35 8 102 6 30 6 96 8 HRC 20 4 67 1 19 8 68 2 20 7 68 2 22 6 70 2 Cold work tool steel HV 80 898 80 935 100 941 82 1009 HRB 46 5 101 7 HB 85 655 Stainless steel HV 85 802 HRC HB 93 334 92 326 Grey cast iron HV HRC HB 131 387 127 364 Nodular cast iron HV HB 19 164 23 210 32 168 Cast aluminium alloys HRB 23 8 84 6 22 7 85 0 23 8 85 5 HB 40 173 BRASS copper zinc alloys HRB 1...

Page 19: ...dness Dia Test tip Material of test tip 1600HV 3mm Tungsten carbide 1600HV 3mm Tungsten carbide 1600HV 3mm Tungsten carbide 1600HV 5mm Tungsten carbide 5000HV 3mm synthetic diamond Impact device diameter Impact device length Impact device weight 20mm 86 147 75mm 50g 20mm 162mm 80g 20mm 141mm 75g 30mm 254mm 250g 20mm 155mm 80g Max hardness of sample 940HV 940HV 1000HV 650HB 1200HV Mean roughness va...

Page 20: ...nder narrow groove or hole D 15 Test groove or reentran t surface C Test small light thi n parts and surface of hardened layer G Test large thick heavy and rough surface steel E Test super high hardness material Table 4 No Type Sketch of non conventional Supporting ring Remarks 1 Z10 15 For testing cylindrical outside surface R10 R15 2 Z14 5 30 For testing cylindrical outside surface R14 5 R30 3 Z...

Page 21: ... SR30 9 HK11 13 For testing spherical inside surface SR11 SR13 10 HK12 5 17 For testing spherical inside surface SR12 5 SR17 11 HK16 5 30 For testing spherical inside surface SR16 5 SR30 12 UN For testing cylindrical outside surface radius adjustable R10 20 ...

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