rockwell hardness testers
 
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"With over 25 years of experience specializing in hardness testers, we are positioned to offer you the right hardness tester for your application. We carry a broad range of bench and portable hardness testers to fit your needs. So tell us what you are testing and we’ll find a quality hardness tester that fits at a great price! With free lifetime technical support."

 
  Bench Type Hardness Testers  
 
     
rockwell hardness tester
ROCKWELL HARDNESS TESTER
twin rockwell / superficial rockwell hardness tester
TALL FRAME ROCKWELL HARDNESS TESTER
superficial rockwell hardness tester
SUPERFICIAL ROCKWELL HARDNESS TESTER
     
superficial rockwell hardness tester
TWIN ROCKWELL / SUPERFICIAL ROCKWELL HARDNESS TESTER
digital rockwell hardness tester
DIGITAL ROCKWELL HARDNESS TESTER
digital rockwell hardness tester
SUPERFICIAL ROCKWELL HARDNESS TESTER
     
twin rockwell / superficial rockwell hardness tester
TWIN ROCKWELL / SUPERFICIAL HARDNESS TESTER
brinell hardness tester
DIGITAL BRINELL HARDNESS TESTER - LOAD CELL
 
   
   
   
  Portable Hardness Testers  
 
     
PHT-MET hardness tester
MET SERIES
ULTRASONIC PORTABLE HARDNESS TESTER
a
pht-1800
PHT-1800
PORTABLE HARDNESS TESTER
 
a
pht-4000 multi-functional portable hardness tester
PHT-3300
Mini-Integrated Portable Hardness Tester
a
     
pht-1800
PHT-1700
PORTABLE HARDNESS TESTER
 
pht-2500
PHT-MET hardness tester
PHT-3500
PORTABLE HARDNESS TESTER
a
pht-1800
PHT-3000
PORTABLE HARDNESS TESTER
 
a
     
 
pht-2500 hardness tester
PHT-2500 hardness tester
PHT-2500 Portable Hardness Tester
pht-2500
pht-4000 multi-functional portable hardness tester
PHT-1840
PORTABLE HARDNESS TESTER
a
pht-4000 multi-functional portable hardness tester
PHT-4000
Multi-Functional Portable Hardness Tester
a
     
   
 
 
pht-2040
PHT-1740
PORTABLE HARDNESS TESTER
a
     
     
Principle of Rockwell hardness testing
The Rockwell hardness test is one of several common indentation hardness tests used today, other examples being the Brinell hardness test and Vickers hardness test. Most indentation hardness tests are a measure of the deformation that occurs when the material under test is penetrated with a specific type of indenter . In the case of the Rockwell hardness test, two levels of force are applied to the indenter at specified rates and with specific dwell times. Unlike the Brinell and Vickers tests, where the size of the indentation is measured following the indentation process, the Rockwell hardness of the material is based on the difference in the depth of the indenter at two specific times during the testing cycle. The value of hardness is calculated using a formula that was derived to yield a number falling within an arbitrarily defined range of numbers known as a Rockwell hardness scale.

The general Rockwell test procedure is the same regardless of the Rockwell scale or indenter being used. The indenter is brought into contact with the material to be tested, and a preliminary force (formally referred to as the minor load) is applied to the indenter. The preliminary force is usually held constant for a set period of time (dwell time), after which the depth of indentation is measured. After the measurement is made, an additional amount of force is applied at a set rate to increase the applied force to the total force level (formally referred to as the major load). The total force is held constant for a set time period, after which the additional force is removed, returning to the preliminary force level. After holding the preliminary force constant for a set time period, the depth of indentation is measured a second time, followed by the removal of the indenter from the test material. The measured difference between the first and second indentation depth measurements, "h", is then used to calculate the Rockwell hardness number. For many older models of Rockwell hardness machines , the operator must manually control most or all of the steps of the test procedure. Many of today's newer machines automatically perform the entire Rockwell test.
 

PORTABLE HARDNESS TESTING

Why portable hardness testing? Portable hardness testers have come of age since the late 90’s, with a vast offering of high tech, digital instrumentation. Small, compact and menu driven, these instruments have never been easier to use for unlimited types of applications.

There are two basic methods of portable hardness testing that is accepted in the field today.
“Dynamic Impact” is based on the Leeb principle of hardness,developed by Dietmar Leeb in the 1970’s. A spring loaded impact body is thrust to the test surface, effecting rebound. The speed of both the initial thrust and the rebound is measured in a non-contact mode. This is calculated as a Leeb hardness value and then automatically converted to Rockwell C, B, Brinell, Vickers and Shore Values. It has effectually brought easy, fast and accurate results to portable hardness testing.
Voltage characteristic of output signal
“Ultrasonic Contact Impedance” is based on a 136 degree diamond at the end of a vibrating rod being depressed into the test surface at a fixed load. The difference in Ultrasonic vibration frequency is then calculated into a hardness value. The UCI test procedure is slower than the Dynamic Impact style, however the “UCI” method of hardness testing is portable, easy and accurate. It also has its own advantages when utilized for certain testing applications. UCI testers are not restricted to large mass items like dynamic type testers. These units can test metals as thin as 1mm and at a hardness value as low as 20HRC (75HB). They also excel at performing hardness tests on larger, harder metals as well. Another reason for the rise in popularity is due to the fact that the UCI method is categorized as  “Non-Destructive”. That translates into less scrap parts/ lower mfg costs due to necessary inspections.
Technical Data for Dynamic Impact Devices
Impact Devices → D/DC/DL D+15 C G
Impact energy 11Nmm 11Nmm 3Nmm 90Nmm
Mass of the impact body 5.   5g 7.  8g 3.  0g 20g
  DL: 7.3g      
Test tip        
* Hardness 1600HV 1600HV 1600HV 1600HV
* Diameter 3mm 3mm 3mm 5mm
* Material   Tungsten Tungsten  
*   carbide carbide  
Impact device        
* Diameter 20mm 20mm 20mm 30mm
* Length 147/86mm 162mm 141mm 254mm
* Weight 75/50g 80g 75g 250g
Max. hardness of sample 940HV 940HV 1000HV 650HB
Preparation of surface        
* Roughness class ISO N7 N7 N5 N9
* Max. roughness depth Rt 10 µ m 10 µ m 2.5 µ m 30 µ m
* Average roughness Ra 2 µ m 2 µ m 0.  4 µ m 7 µ m
Min. weight of sample        
* Of compact shape 5kg 5kg 1.5kg 15kg
* On solid support 2kg 2kg 0.5kg 5kg
* Coupled on plate 0.  1kg 0.  1kg 0.  02kg 0.  5kg
Min. thickness of sample        
* Coupled 3mm 3mm 1mm 10mm
* Min. thickness of layers 0.  8mm 0.  8mm 0.  2mm    -
Indentation of test tip        
With 300 HV        
* Diameter 0.  54mm 0.  54mm 0.  38mm 1.03mm
* Depth 24 µ m 24 µ m 12 µ m 53 µ m
with 600 HV        
* Diameter 0.  45mm 0.  45mm 0.  32mm 0.  90mm
* Depth 17 µ m 17 µ m 8 µ m 41 µ mC
with 800 HV        
* Diameter 0.  35mm 0.  35mm 0.  30mm    -
* Depth 10 µ m 10 µ m 7 µ m    -
Technical Data for UCI Hardness Tester
Test Device

U1
(UCI)

Length 160mm
Diameter 25mm
Indentation Depth 30µm
Pressure Force 14.7N
Transducer Test Life (approx) 200,000
Min. Thickness for test 1mm
Min. Radius for Test 5mm
Max Roughness of surface Ra 2.5µm
Max Archive 100 Tests
Time of Test 4 sec.

Comparison of Hardness Testing Methods-Phase II Models shown below

Data Dynamic Ultrasonic Rockwell
Requirements      
Surface Finish Smooth Smooth Smooth-Semi Rough
Rigid Support of Sample Yes Yes Yes
Test sample portability Not required Not required Required
Procedures      
Structural Steel Functional Functional Functional
Heat Treated Steel Functional Functional Functional (HRC)
Case Hardened Material Functional Functional Functional (HRC)
Non-Ferrous Metals Functional Functional Functional (HRB)
Large Samples Yes Yes Restricted
Small Samples Restricted Yes Yes (w/proper scales)
Thin Samples Restricted Yes Restricted
Curved/Round Surfaces Yes Yes Restricted
Special Features      
Automatic Test Procedure Yes Yes Yes
Direct Hardness Value Yes Yes Yes
Required Time for Avg/5 Tests Approx. 10 Sec. Approx. 20 Sec. Approx. 2 Minutes
Digital Display Yes Yes Some Models
Scale Conversions Yes Yes Some Models
Directional Testing Yes Yes No
Standardized by: ASTM ASTM NIST (HRC scale only)
Indentation Depth 20µm 30µm 160µm
Operator Requirements      
Skills Required Minimal Minimal Minimal
Possible Reading Error None None None
Instrument Features      
Portability Yes Yes No
Power Supply Battery Battery Manual/110v
Output to PC Yes Yes Some Models
Type Model Model
Dynamic Testers PHT-2000D PHT-2500D
Ultrasonic (UCI) MET-U1 MET-UD
Rockwell 900-331 & 900-340 900-360 & 900-370
   
 
 
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