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8.1.3 Nomenclature

When quoting a Brinell hardness number (BHN or more commonly HB), the conditions of the
test used to obtain the number must be specified. The standard format for specifying tests can
be seen in the example "HBW 10/3000".

HBW - tungsten carbide ball indenter

HB or HBS - hardened steel ball.

10 is the ball diameter in millimeters.

3000 is the force in kilograms force.

The hardness may also be shown as XXX HB YYD2. The XXX is the force to apply (in kgf) on a
material of type YY (5 for aluminum alloys, 10 for copper alloys, 30 for steels). Thus a typical
steel hardness could be written: 250 HB 30D2.

8.1.4 Multiple Scales of test load are available for this tester, and they shall be properly
selected as the nominal values specified below.

Hardness

Ball Diameter

(mm)

0.102 F/D

2

(F/D

2

)

Test Load F

N (kgf)

HBW 10/3000

10

30

29400 (3000)

HBW 10/1500

10

15

14700 (1500)

HBW 10/1000

10

10

9800 (1000)

HBW 10/500

10

5

4900(500)

HBW 10/250

10

2.5

2450 (250)

HBW 10/100

10

1

980(100)

HBW 5/750

5

30

7350 (750)

HBW 5/125

5

5

1225 (125)

HBW 2.5/187.5

2.5

30

1837.5 (187.5)

HBW 2.5/62.5

2.5

10

612.5 (62.5)

8.1.5 Dwell times

Ferrous (steel) metals: 10-15 seconds
Non-ferrous metals: 30 seconds (60 seconds for <35 HBW)

8.1.6

Distance from sample edge and in-between indents

At least 2.5X indent diameter

3X the indent size in-between indent

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Содержание OMEGA-HB

Страница 1: ...s www metallographic com VERSION 1 0 Equipment type Brinell Hardness Tester Model OMEGA HB Electrical Requirements 110 Volts Single phase Frequency 50 60 Hz Manual Revision Date April 24 2022 WARNINGS Please read the instructions carefully before turning on the machine Supplying the wrong voltage will cause severe damage to the electrical system Do not disassemble ...

Страница 2: ...2 ...

Страница 3: ...ng tie downs 11 3 3 5 Lever Positioning 12 3 3 6 Installing Anvil Stage 12 Section 4 Control Board and Its Functions 13 Section 5 Safety Guidelines 14 5 2 Safety Precautions 14 5 3 Emergency Statement 14 6 Start up and Operation 15 6 1 Preparatory work 15 6 2 Usage of the instrument 15 Section 7 Optical Manual Microscope 19 7 1 Eyepiece Components 19 7 2 Technical specifications microscope 19 7 3 ...

Страница 4: ...4 Section 9 Maintenance 28 9 1 General 28 9 2 Adjustment of the Tester 28 9 3 Special Attentions 29 9 4 Working Principle of the Electric Parts 30 10 Troubleshooting 32 ...

Страница 5: ...nologies is the sole purpose of identifying such goods and shall not create an express warranty that the goods shall conform to such description THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED THERE ARE NO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE THIS WARRANTY STATES PACE TECHNOLOGIES ENTIRE AND EXCLUSIVE LIABILITY AND BUYER S EXCLUSIV...

Страница 6: ...uspension of warranty rights 7 MISCELLANEOUS PROVISIONS This agreement has been made in and shall be governed by the laws of the State of Arizona These terms and conditions and the description of the Products on the reverse side hereof or in any proposal submitted herewith constitute the entire agreement and understanding of the parties with respect to this sale and supersede all prior and contemp...

Страница 7: ... 612 9 N 100 kg 980 N 125 kg 1226 N 187 5 kg 1839 N 250 kg 2452 N 500 kg 4900 N 750 kg 7335 N 1000 kg 9800 N 1500 kg 14700 N 3000 kg 29400 N Hardness Range HBW 8 650 HBW Dwell time of test force 5 60 seconds Max Height of Specimen 8 7 inches 220 mm Max Width of Specimen 5 3 inch 135 mm Minimum Division on micrometer drum wheel 0 005 mm Weight 275 lbs 125 kg Dimensions W x D x H 9 25 x 21 5 x 29 7 ...

Страница 8: ...urate size of indent 0 37xD mm 2 5 0 63 1 50 0 93 5 1 25 3 00 1 85 10 2 50 6 00 3 70 The following table also help determine the correct Brinell hardness ranges based on the materials being tested Material Brinell hardness F D2 Steel nickel alloy titanium alloy 30 Cast iron 140 10 140 30 Copper copper alloy 35 5 35 130 10 130 30 Light metal its alloy 35 2 5 35 80 5 10 80 10 F test force kg D ball ...

Страница 9: ...r mm F D2 Test Force N kg HBW 10 3000 10 30 29420 3000 HBW 10 1500 10 15 14710 1500 HBW 10 1000 10 10 9807 1000 HBW 10 500 10 5 4903 500 HBW 10 250 10 2 5 2452 250 HBW 10 100 10 1 980 7 100 HBW 5 750 5 30 7355 750 HBW 5 125 5 5 1226 125 HBW 2 5 187 5 2 5 30 1839 187 5 HBW 2 5 62 5 2 5 10 612 9 62 5 ...

Страница 10: ...e bottom using appropriate lifting techniques The OMEGA HB Brinell hardness tester is constructed of sensitive electronic and mechanical components Do not drop Use caution when unloading to prevent injury 3 3 Installation Install unit carefully Improper installation voids warranty 3 3 1 TABLE LOCATION Installation of the OMEGA HB should be on a flat sturdy surface with easy access to electrical co...

Страница 11: ...ble level on stage and adjust feet height to level the unit 3 3 4 REMOVE SHIPPING TIE DOWNS Attach four leveling feet and use bubble level on anvil to level unit Open the upper cover Remove the tie string Template Indenter Tightening screw Switch Rotating wheel Lifting screw Power cord Fus Testing Panel Upper ...

Страница 12: ...wn the main lever by hand and slide the blade into the groove see image below Replace upper cover 3 3 6 INSTALLING ANVIL STAGE Insert anvil into up down screw feed 3 3 7 INSTALLING INDENTER Install the indenter so that the flat end of the shank is facing the screw Lift the indenter all the way into the guide and tighten the screw It is good practice to set the indenter in place by doing an indent ...

Страница 13: ...ements with a range from 5 60 seconds Initial dwell time is set to 15 seconds FORCE FORCE Test force selection key There are 10 force settings The red indicator LED is red for 62 5 100 125 187 5 250 kg forces and the green LED is for 500 750 1000 1500 3000 kg forces STOP Stop key It is necessary to stop the operation press STOP The hardness tester will go back to the starting position To continue ...

Страница 14: ...se severe damage to the electrical system Proper operator training is required for operation of the OMEGA HB Brinell hardness tester Unauthorized mechanical and electrical changes as well as improper operation voids all warranty claims All service issues need to be reported to the manufacturer supplier Operate unit as specified in this manual Disconnect power before opening unit Lower stage to avo...

Страница 15: ...align the flat edge towards the screw and then tighten 6 2 2 Turn on the power switch the panel display window will count down When the display window shows test force of zero the instrument automatically adjusts to the starting position 6 2 3 When starting up the default test force is set to 2452N 250kg the dwell time is set to 15 seconds If you want to change the test force or dwell time refer t...

Страница 16: ... procedure 6 2 6 When loading dwell and unloading is completed lower the table to automatically reset the instrument 6 2 7 The recommended Dwell times are 10 15 seconds for ferrous metal 30 seconds for nonferrous metal 60 seconds for those hardness value is less than 35HBW Average diameter of indentation d Minimum thickness of specimen Diameter of steel ball D 1 D 2 5 D 5 D 10 0 2 0 08 0 3 0 18 0 ...

Страница 17: ...entation s centers should be not less than 3 times the diameter of the indentation the distance between the indentation center and the edge of the specimen should be not less than 2 5 times the diameter of the indentation Failure to comply can result in asymmetric indents resulting in incorrect hardness values 6 2 9 Each indentation diameter is measured on two vertical directions The ratio of the ...

Страница 18: ...e dwell time cycle the display window test force constantly shows the instantaneous force value When the indenter gradually presses into the specimen the force value decreases Once the value is reduced to the prescribed error range the instrument will automatically adjust and the test force will be maintained within the specified range ...

Страница 19: ...easure the size of the indent 7 2 TECHNICAL SPECIFICATIONS MICROSCOPE 7 2 1 Magnification of the reading microscope 20X 7 2 2 Minimum division value of the drum wheel 0 005mm 7 2 3 The effective measuring range of the field of view 6mm Eye guard Reading drum wheel Eyepiece Lens barrel screw Objective Long lens barrel Lens barrel base ...

Страница 20: ...indentation edge clear 7 3 3b Use any digit on the fixed glass of the eyepiece as the starting line case grid 2 hold the reading microscope in position and then rotate the drum wheel so the filar aligns with the other side of the indent 7 3 3c Read from the eyepiece the integer value is 6 6 2 4mm and accumulate the remaining fraction from the dial For this example the method is as follows read fro...

Страница 21: ... factory Do not disassemble and reassemble 7 4 2 The reading microscope should be stored in a dust free dry and noncorrosive environment 7 4 3 If the surface of the reading microscope lens is dirty it can be wiped by soft cotton and lens paper if it has an oil film it can be wiped with a cotton swab and IPA or ether ...

Страница 22: ...en carbide ball is used The BHN can also be converted into the ultimate tensile strength UTS although the relationship is dependent on the material and therefore is only an empirically based value Hardness testing is accomplished with a ball of specified diameter D being pressed by a specified force F into surface of the object to be tested see figure below The test force is removed after holding ...

Страница 23: ...h steel indenters HBW is calculated in both standards using the SI units as 8 1 Technical Data for Hardness Evaluation 8 1 1 The degree of loading 1 02F D is important because different results can be obtained depending on which degree of loading was used For example a Brinell hardness value determined with a 10 mm ball and 9 807N degree of loading 10 for a material is different from the hardness ...

Страница 24: ...ever the Brinell method cannot be used for hardened steel As there is no diamond penetrator intended for the Brinell procedure Tests on treated steel with hardness greater than 1765 N mm is not acceptable Soft iron is usually tested with HB x 3000 although the indentation diameter exceeds 0 6 of the ball diameter Cast iron HBW x 3000 Due to the smaller homogeneity it is recommended to use the high...

Страница 25: ...typical steel hardness could be written 250 HB 30D2 8 1 4 Multiple Scales of test load are available for this tester and they shall be properly selected as the nominal values specified below Hardness Ball Diameter mm 0 102 F D2 F D2 Test Load F N kgf HBW 10 3000 10 30 29400 3000 HBW 10 1500 10 15 14700 1500 HBW 10 1000 10 10 9800 1000 HBW 10 500 10 5 4900 500 HBW 10 250 10 2 5 2450 250 HBW 10 100 ...

Страница 26: ...hickness In general the specimen thickness should be 8 10 X the depth of the indent see following table Average Dent Diameter d Minimum Specimen Thickness Ball Diameter D 1 D 2 5 D 3 D 10 0 2 0 10 0 3 0 23 0 4 0 41 0 5 0 68 0 6 0 8 0 36 0 7 0 50 0 8 0 66 0 9 0 84 1 1 04 1 1 1 28 1 2 1 54 0 73 1 3 1 83 0 86 1 4 2 15 1 00 1 5 2 5 1 15 1 6 1 31 1 7 1 49 1 8 1 68 1 8 1 88 2 2 09 2 2 2 55 2 4 3 08 1 47...

Страница 27: ...27 4 6 5 60 4 8 6 14 5 6 70 5 2 7 29 5 4 7 91 5 6 8 58 5 8 9 28 6 10 00 ...

Страница 28: ...uirements and standards However some variation may be caused by transportation disassembly or voltage difference etc therefore the user may need to make the following adjustments 9 2 1 The surface of specimen and the indenter may need to be cleaned of any oil or dust Use IPA or ethanol to clean specimen and indenter 9 2 2 If the tester has been moved or not used for some time make several indents ...

Страница 29: ...T key the beeper will sound and other pages may appear on display In such case just press OK ESC key to return Home Page and the tested data will not be affected If EXIT key is pressed by mistake the tester will be shut down and unsaved data are lost 9 3 5 When cursor is flashing at Dwell Light Change or Time on the Home Page the tester is not in ready state to start test Press OK ESC key and wait...

Страница 30: ...ng force is more stable and reliable The tester uses a Japan made DMF 50081 320 240 LCD as display user may choose desirable test load and indenter on the display after start up of the tester Other data including D1 and D2 indent diameter HBW hardness and corresponding converted value are also shown on the display After completion of the test cycle the data may be output through RS232 serial inter...

Страница 31: ...to B switch during the loading period the switch will stop the motor and cause it to rotate in the counter direction thus providing the automatic unloading and return of the lever to its original position ...

Страница 32: ... the tester is on the keys do not work The instrument is not in working state When the tester is turned on wait until the instrument returns to the working state The Up Down Lead Screw is hard to move The space between the Up Down Lead Screws are blocked by the thread ends or dirt Remove the protecting cover for the Up Down Lead Screw and clean the screw threads ...

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