MRC MH180 User manual

MH180 Leeb Hardness Tester
User’s Manual
Hagavish st. Israel 58817 Tel: [phone], Fax: [phone] [email protected]
MRC.7.14
PLEASE READ THIS MANUAL CAREFULLY BEFORE OPERATION

1 Overview .........................................................................................................................3
1.1 Advantages.........................................................................................................................................3
1.2 Main Application &Testing Range ....................................................................................................3
1.2.1 Main Application ............................................................................................................................3
1.2.2 Testing Range..................................................................................................................................3
1.3 Technical Specifications ....................................................................................................................4
1.4 Configuration.....................................................................................................................................4
1.5 Working Conditions...........................................................................................................................5
2 Structure Feature &Testing Principle ..........................................................................5
2.1 Structure Feature................................................................................................................................5
2.1.1 D Type Impact Device....................................................................................................................6
2.1.2 Different Types of Impact Device...................................................................................................6
2.2 Main Screen.......................................................................................................................................6
2.3 Keypad Definitions............................................................................................................................7
2.4 Leeb Hardness Testing Principle........................................................................................................8
3 Preparation......................................................................................................................8
3.1 Instrument Preparation and Inspection ..............................................................................................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 Viewing stored file/Group.............................................................................................................13
5.6.2 Clearing selected file/Group.........................................................................................................14
5.7 Print Report......................................................................................................................................14
5.8 System Reset....................................................................................................................................14
5.9 EL Backlight....................................................................................................................................14
5.10 Auto Power Off..............................................................................................................................15
5.11 Battery Replacement......................................................................................................................15
5.12 Connecting to a Computer.............................................................................................................15
5.13 Error Code Reference ....................................................................................................................15
6 Maintenance & Servicing............................................................................................16
1

2
6.1 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

1 Overview
1.1 Advantages
Wide measuring range. Based on the principle of Leeb hardness testing theory. It can
measure the Leeb hardness of all metallic materials.
Large screen LCD, showing all functions and parameters. With EL background light.
Seven impact devices are available for special application. Automatically identify the
type of impact devices.
Test at any angle, even upside down.
Direct display of hardness scales HRB, HRC, HV, HB, HS, HL
Large memory could store 100 groups (Relative to average times 32～1 ) information
including single measured value, mean value, impact direction, impact times, material
and hardness scale etc.
Battery information showing the rest 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 Application
Die cavity of molds
Bearings and other parts
Failure analysis of pressure vessel, steam generator and other equipment
Heavy work piece
The installed machinery and permanently assembled parts.
Testing surface of a small hollow space
Material identification in the warehouse of metallic materials
Rapid testing in large range and multi-measuring areas for large-scale work piece
1.2.2 Testing Range
Testing range refer to Table 1 and Table 2 in the Appendix.
3

1.3 Technical Specifications
Error and repeatability of displayed value see Table1-1 below.
Table 1-1
No. Type of
impact device
Hardness value of Leeb
standard hardness block
Error of displayed
value Repeatability
1 D 760±30HLD
530±40HLD
±6 HLD
±10 HLD
6 HLD
10 HLD
2 DC 760±30HLDC
530±40HLDC
±6 HLDC
±10 HLDC
6 HLD
10 HLD
3 DL 878±30HLDL
736±40HLDL ±12 HLDL 12 HLDL
4 D+15 766±30HLD+15
544±40HLD+15 ±12 HLD+15 12 HLD+15
5 G 590±40HLG
500±40HLG ±12 HLG 12 HLG
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 Configuration
Table 1-2
No. Item Quantity Remarks
1 Main unit 1
2 D type impact device 1 With cable
3 Standard test block 1
4 Cleaning brush (I) 1
5 Small support ring 1
6 Alkaline battery 2 AA size
7 Manual 1
Standard
Configuration
8 Instrument package
case
1
4

9
11 Cleaning brush (II) 1 For use with G
type impact
device
12 Other type of impact
devices and support
rings
Refer to Table 3
and Table 4 in the
appendix.
13 DataPro software 1
14 Communication cable 1
15 Micro Printer 1
Optional
Configuration
16 Print cable 1
1.5 Working Conditions
Working temperature：0℃～＋40℃；
Storage temperature：-30℃～＋60℃
Relative 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 S teel
2-Stainless Steel
3-Gray Cast Iron
4-Nodular Cast Ir on
5-Cast Aluminum Alloys
6-Copper-Zinc Alloys
7-Copper-Aluminum
8-Wrought Copper
9-Wrought Steel
Material Option:
1. Main unit 2.Keypad 3. LCD display 4 Socket of RS232
5. Socket of impact device 6. Impact device 7 Label 8. Battery cover
5

2.1.1 D Type Impact Device
1 2 3 4 5 6 7
1 Release button 2 Loading tube 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

Material No
Instruction of the Main Display Screen:
Material ： The present presetting material.
Impact direction ： The present impact direction.
Hardness scale ： Hardness scale of the present measured value.
Battery information ： Showing the rest capacity of the battery.
Measured value ： Display present single time measured value（without showing average
icon）， or display the present mean value (with average icon prompting). “-HI-”means
over conversion value or measure range. “-LO-”means lower than conversion value or
measure range.
Impact times
： Times that have been impacted.
Average Icon
： It will appear when showing the mean value of the measured values after
reaching the presetting impact times.
Memory Icon: It appears when operating the instrument memory.
2.3 Keypad Definitions
Table 2-1
n
/off the EL backlig
a
ve or Data Delete
e
instrument on/off
l Selection
s
s/Strength switch Up
s
s Scale Selectio
n
o
n change
o
r Down
a
ta
T
imes set
g
ging or Ente
r
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 key could switch on of off the background light of LCD.
Press key to set the impact direction.
Press key to change the impact times in one group. The impact times item will flash
when first pressing the key, and then the impact times value will plus or minus when
pressing the or key. Press key finally to exit from changing the impact
times process.
Press key to change the hardness scale.
Press key to change the material. Presetting hardness scale recovers to HL
automatically after material presetting changed.
7

Press key to switch between hardness test and strength test. Only D and DC type
of impact device has the function of strength testing. So hardness testing is the only
selection if the impact device is not D or DC type.
Press key to print out the measured values after measurement.
2.4 Leeb Hardness Testing Principle
The basic principle is to use an impact body of certain weight impacts against the
testing surface under certain test force, then measure the impacting velocity and the
rebounding velocity of the impact body respectively when the spherically test tip is located
1mm above the testing surface.
The calculation formula is as follows:
האיגש!תרדגומ הניא הינמיסה.HL=1000×VB/ VA
Where, HL—— Leeb hardness value
VB—— Rebounding velocity of the impact body
VA—— Impacting velocity of the impact body
3 Preparation
3.1 Instrument Preparation and Inspection
Verification of the instrument is by using standard 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 screen shows as left below.
Test for 5 points on the standard hardness block. It would display the average measured
value after measuring 5 times. Press key to change to its nominal value.
Press key to confirm the calibration finally. Or press the key to cancel the calibration.
Range of adjustment: ±30HL.
The measurement parameters, including the material setting, the hardness scale and the
impact direction can’t be changed during calibration.
Note：Use a calibrated hardness tester, test the standard test block
downward vertically for 5 times, the arithmetical average value compare with
the value of standard test block. If this value exceeds the standard value, could
use the function of user calibration to adjust
8

3.2 Impact Device Selection
Refer to Appendix Table 1 and Table 3 for selection of impact device.
3.3 Preparation of the Sample Surface
Preparation for sample surface should conform to the relative requirement in Appendix
Table 3.
In the preparation processing for sample surface, the hardness effect of being heated or
cold processing on the surface of sample should be avoided.
Too big roughness of the being measured surface could cause error. So, the surface of
the sample to be measured must appear metallic luster, smoothing and polish, without
oil stain.
Support of test sample. Support is no necessary for heavy sample. Medium-weight parts
must be set on the smoothing and stable plane. The sample must set absolutely
equability and without any wobble.
Curved surface: The best testing surface 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 depth of hardened layer should
conform to Table 3.
Coupling. Light-weight sample must be firmly coupled with a heavy base plate. Both
coupled surface must be flat and smooth, and there is no redundant coupling agent
existing. The impact direction must be vertical to the coupled surface. When the sample
is a big plate, long rod or bending piece, it can be deformed and become unstable,
even though its weight and thickness is big enough, and accordingly, the test value may
not be accurate. So the sample should be reinforced or supported at its back.
Magnetism of the sample itself should be avoided.
9

4 Testing Program
4.1 Start-Up
Insert the plug of the impact device into the socket of impact device on the instrument.
Press the key，now power is on. The instrument is in working mode.
4.2 Loading
Pushing the loading-tube downwards until contact is felt. Then allow it to slowly return to
the starting position or using other method locking the impact body.
4.3 Localization
Press the impact device supporting ring firmly on the surface of the sample, the impact
direction should be vertical to the testing surface.
4.4 Testing
Press the release button on the upside of the impact device to test. The sample and the
impact device as well as the operator are all required to be stable now. The action
direction should pass the axis of the impact device.
Each measure area of the 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 conversion relations for the special material. Use
inspection qualified Leeb hardness tester and corresponding hardness tester to test at
the same sample respectively. For each hardness value, each measure
homogeneously 5 points of Leeb hardness value in the surrounding of more than three
indentations which need conversion hardness, using Leeb hardness arithmetic average
value and corresponding hardness average value as correlative value respectively,
make individual hardness contrastive curve. Contrastive curve at least should include
three group of correlative data.
Table 4-1
10

Distance of center of the
two indentations
Distance of center of the
indentation to sample edge
Type of Impact
Device
Not less than (mm) Not less than (mm)
D、DC 3 5
DL 3 5
D+15 3 5
G 4 8
E 3 5
C 2 4
4.5 Read Measured Value
After each impact operation, the LCD will display the current measured value, impact
times plus one, the buzzer would alert a long howl if the measured value is not within the
valid range. When reaching the presetting impact times, the buzzer will alert a long howl.
After 2 seconds, the buzzer will alert a short howl, and display the mean measured value.
4.6 Notification
Replacing 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 testing when using other types of impact device.
The setting would be set to hardness testing automatically after replacing the impact
device whether the setting is hardness testing or not before.
Not all materials could convert to all hardness scale value. The hardness scale is reset
to HL automatically after changing the material. So select material firstly before
changing the hardness scale.
11

5 Operation Detail
5.1 Power On/Off
Press to power on the instrument. Be sure to plug in the impact device before
powering on. The system would automatically detect the type of the impact device during
power up, and would display this information on the screen. Users should pay attention to
the probe type displayed on the screen. After pausing for several second, the screen will
exit and enter the main display screen as following:
The instrument can be turned off by pressing the key while it is working. The tool
has a special memory that retains all of its settings even when the power is off.
5.2 Material Setting
Press key to change the material to the one you want to preset. Hardness scale
recovers to HL automatically after material presetting changed. Please select material firstly,
then select hardness scale.
In hardness 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 Material No. Material
0 Steel and cast steel 5 Cast aluminium alloys
1 Cold work tool steel 6 Copper-Zinc alloys
2 Stainless steel 7 Copper –Aluminium alloys
3 Gray cast iron 8 Wrought copper
4 Nodular cast iron 9 Wrought steel
In strength testing, the following materials are selectable: Mild Steel、High-Carbon Steel、
Cr Steel、Cr-V Steel、Cr-Ni Steel、Cr-Mo Steel、Cr-Ni-Mo Steel、Cr-Mn-Si Steel、Super
Strength Steel and Stainless Steel. The relationship between the material number displayed
on the instrument screen and the material is as follows:
Table 5-2
Material No Material Material No Material
0 Mild steel 5 Cr-Mo steel
12

1 High carbon steel 6 Cr-Ni-Mo steel
2 Cr steel 7 Cr-Mn-Si steel
3 Cr-V steel 8 Super strength steel
4 Cr-Ni steel 9 Stainless steel
5.3 Hardness/Strength testing
Press key to switch between hardness testing and strength testing (бb) .
Note: Only D and DC type of impact device has the function of strength testing. So
hardness testing is the only selection if the impact device is not D or DC type.
In hardness testing, Press key to change the hardness scale. The supported hardness
scale includes: HL, HV, HB, HRC, HS, HRB and HRA.
Note ：
Here only displays the valid hardness scale for the present selected impact
device and material. It would not display the hardness scale which is not valid.
Please select material firstly, then select hardness scale.
Presetting hardness scale recovers to HL automatically after presetting material
is changed.
5.4 Impact Direction Setting
Press the key to move to the impact direction that you will preset.
5.5 Average 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 key after a new measurement finishes-the screen
showing the “AVE” icon, the measured hardness/strength group values will be saved to
memory. The new saved file is appended as the last file of the memory. This function
provides the user with the ability to view/delete a file/group previously saved in memory.
5.6.1 Viewing stored file/Group
To view the memory data, follow the steps:
1) Press the key to activate the data logging function. The memory icon will appear. It
will display the current file name, the test parameter of the group data and the mean
value of the group. If there is no data in the memory, it will display: <E04>, which means
no memory data, and then return back.
2) Use the key and the key to select the desired file to view.
13

3) Press the key to see details of that group data.
4) Use the key and the key to view each single measured data in that group while
viewing details.
5) Press the key to return to previous screen at any time during data logging.
5.6.2 Deleting selected file/Group
The user may require deleting a file from the instrument memory. The procedure is
outlined in the following steps.
1) Press the key to activate the data logging function. The memory icon will appear. It
will display the current file name, the test parameter of the group data and the mean
value of the group. If there is no data in the memory, it will display: <E04>, which
means no memory data, and then return back.
2) Use the key and the key to scroll to the file that will be deleted.
3) Press the key on the desired file. It will automatically delete the file, and display
“-DEL”.
4) Press the key, at any time, to exit the data logging function and return to
measurement mode.
Note ： Do not shut down the instrument while deleting data. It could lead to
unpredicted consequence if shutting down while deleting.
5.7 Print Report
At the end of the inspection 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 testing process, by easily pressing the key. If you want to print
the data stored in the instrument memory, then following is the steps:
1. Press the key to activate the data logging function. The memory icon will appear.
2. Use the key and the key to select the desired file.
3. Press the key to print the selected file. This operation will send all the data in current
file to the mini printer via RS232 port and print them out.
4. Press the key to exit the data logging functions and return to measurement mode.
5.8 System Reset
Press down the key while powering on the instrument will restore factory defaults. The
only time this might possibly helpful is if the parameter in the gauge was somehow
corrupted.
5.9 EL Backlight
With the EL background light, it is convenient to work in the dark condition. Press key
to switch on or switch off the background light at any moment as you need after power on.
14

Since the EL light will consume much power, turn on it only when necessary.
5.10 Auto Power Off
The instrument features an auto power off function designed to conserve battery life. If
the tool is idle (neither measuring nor any key operation) for 5 minutes, it will turn itself off.
Before powering off, the LCD display of the instrument will continue flashing for 20 seconds.
Except key , press any key could stop the twinkle of LCD screen and stop the operation
of power off at the moment.
While the voltage of the battery is too low, the display will show <E00>, then power off
automatically.
5.11 Battery Replacement
Two AA size alkaline batteries are needed as the power source. After several hours’
usage of the batteries, the battery symbol on the screen will be shown as . The more
of dark part indicates 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 the accessory cable (The
cable and following referred software are optional parts), the gauge has the ability to
connect to a computer, or external storage device. Measurement data stored in the memory
of the gauge can be transferred to the computer through the RS232 port. Detailed
information of the communication software and its usage refer to the software manual.
5.13 Error Code Reference
Error Code Explanation Error Code Explanation
E00 Battery exhausted E05 Can not print
E01 Value out of range E06
E02 Measurement not
finished
E07
E03 Data already saved E08
E04 No memory data E09
15

6 Maintenance & Servicing
6.1 Impact Device Maintenance
After the impact device has been used for 1000--2000 times, please use the nylon
brush provided to clean the guide tube and impact body. When cleaning the guide tube,
unscrew the support ring first, then take out the impact body, spiral the nylon brush in
counter-clock direction into the bottom of guide tube and take it out for 5 times, and
then install the impact body and support ring again.
Release the impact body after use.
Any lubricant is absolutely prohibited inside the impact device.
6.2 Instrument Maintenance Program
When using standard Rockwell hardness block to testing, 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 Analysis & Evacuation
Fault Appearance Fault Analysis Handling method
Failure power on Battery exhaustion Replace the batteries
No measured value
m
pact device cable failure Replace the cable
6.4 Notice of Transport and Storage Conditions
Keep it away from vibration, strong magnetic field, corrosive medium, dumpiness and
dust. Storage in ordinary temperature.
With original packing, transport is allowed on the third grade highway.
16

APPENDIX
Table 1
Impact device
Material Method
D/DC D+15 C G E DL
HRC 20～
68.5 19.3～ 67.9 20.0～ 69.5 22.4～70.7 20.6～ 68.2
HRB 38.4～
99.6
47.7～
99.9 37.0～ 99.9
HRA 59.1～
85.8 61.7～88.0
HB 127～
651 80～638 80～683 90～646 83～663 81～646
HV 83～976 80～937 80～996 84～1042 80～950
Steel and cast
steel
HS 32.2～
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 40～173BRASS(copper-
zinc alloys) HRB 13.5～
95.3
BRONZE(copp
er-aluminium/ti
n alloys) HB 60～290
Wrought copper
alloys HB 45～315
17

Table 2
No. Material HLD Strength σb(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:
1.6μm 1.6μm 0.4μm 6.3μm 1.6μm
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

surface hardening ≥0.8mm ≥0.8mm ≥0.2mm ≥1.2mm ≥0.8mm
Size of tip indentation
Hardness
300HV
Indentation
diameter
Depth of
indentation
0.54mm
24μm
0.54mm
24μm
0.38mm
12μm
1.03mm
53μm
0.54mm
24μm
Hardness
600HV
Indentation
diameter
Depth of
indentation
压痕深度
0.54mm
17μm
0.54mm
17μm
0.32mm
8μm
0.90mm
41μm
0.54mm
17μm
Hardness
800HV
Indentation
diameter
Depth of
indentation
0.35mm
10μm
0.35mm
10μm
0.35mm
7μm
--
--
0.35mm
10μm
Available type of impact
device
DC: Test hole
or hollow
cylindrical;
DL:Testslender
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 Z25-50 For testing cylindrical outside
surface R25～R50
4 HZ11-13 For testing cylindrical inside
surface R11～R13
5 HZ12.5-17 For testing cylindrical inside
surface R12.5～R17
6 HZ16.5-30 For testing cylindrical inside
surface R16.5～R30
7 K10-15 For testing spherical outside
surface SR10～SR15
19