which hardness test is more accurate
200HRS-150 Product Introduction:
The 200HRS-150 digital Rockwell hardness counter is a high-precision, stable performance high-tech product. The interface is menu-oriented, and the operation is simple, intuitive and convenient. The measuring device uses a high-precision grating displacement sensor. The system is controlled by an ARM32 chip. It is a mechatronics hardness tester.
Advantage features:
1. The measuring device uses a grating displacement sensor to display the results through the LCD screen, and can display and set the test scale, test force, indenter type, holding time, conversion unit, etc.;
2. The fuselage is made of high-quality cast iron by one-time casting, and the car paint treatment process is used to make the appearance sleek and beautiful;
3. Convenient control system, which can automatically convert the unit of the full hardness scale;
4. The built-in test software can make ±3HR corrections to the machine;
5. The loading, holding and unloading of the test force are controlled by the motor, which eliminates the human operation error of the manual Rockwell hardness tester;
6. It is equipped with a wireless Bluetooth printer and can output data through the RS232 port;
7. Accuracy complies with GB/T230.2-2018, ISO6508-2 and American ASTM E18 standards.
200HRS-150 Technical Specification:
| Technical Parameter |
Model |
| 200HRS-150 |
| Initial test force |
98.07N(10kgf) |
· |
| Total test force |
588.4N(60kgf),980.7N(100kgf),1471N(150kgf)
|
· |
| Measuring range |
20-95HRA ,20-100HRBW,20-70HRC |
· |
| Dwell time |
1-30s |
· |
| Maximum height of specimen |
200mm |
· |
| Distance from indentation center to machine wall |
160mm |
· |
| Hardness resolution |
0.1HR |
· |
| Precision |
Accord to GB/T230.2/ISO6508-2& US ASTM E18 standard
|
· |
| Dimensions |
510*290*730(mm) |
· |
| net weight |
80kg |
· |
| Gross weight |
92kg |
· |
Note:"·"is the standard configuration;" O"is spare use
200HRS-150 Packing List:
| Name |
Specification |
Qty |
Unit |
| Digital Rockwell Hardness Tester |
200HRS-150 |
1 |
Set |
| Diamond indenter |
|
1 |
PC |
| Carbide ball indenter |
Φ1.588mm |
1 |
PC |
| Large, small, V-shaped sample stage |
|
Each 1 |
PC |
| Standard hardness block |
HRA,HRB |
Each 1 |
PC |
| Standard hardness block |
HRC(High,Middle,Low) |
Total 3 |
PC |
| Bluetooth printer |
|
1 |
PC |
| Manual, certificate, packing list |
|
Each1 |
PC |
Hardness is a characteristic of a material, not a fundamental physical property. It is defined as the resistance to indentation, and it is determined by measuring the permanent depth of the indentation. More simply put, when using a fixed force (load) and a given indenter, the smaller the indentation, the harder the material.
Indentation hardness value is obtained by measuring the depth or the area of the indentation using one of over 12 different test methods. Learn more about hardness testing basics here.
The Rockwell hardness test method, as defined in ASTM E-18, is the most commonly used hardness test method. You should obtain a copy of this standard, read and understand the standard completely before attempting a Rockwell test.
The Rockwell test is generally easier to perform, and more accurate than other types of hardness testing methods. The Rockwell test method is used on all metals, except in condition where the test metal structure or surface conditions would introduce too much variations; where the indentations would be too large for the application; or where the sample size or sample shape prohibits its use.
The Rockwell method measures the permanent depth of indentation produced by a force/load on an indenter. First, a preliminary test force (commonly referred to as preload or minor load) is applied to a sample using a diamond or ball indenter. This preload breaks through the surface to reduce the effects of surface finish. After holding the preliminary test force for a specified dwell time, the baseline depth of indentation is measured.
After the preload, an additional load, call the major load, is added to reach the total required test load. This force is held for a predetermined amount of time (dwell time) to allow for elastic recovery. This major load is then released, returning to the preliminary load. After holding the preliminary test force for a specified dwell time, the final depth of indentation is measured. The Rockwell hardness value is derived from the difference in the baseline and final depth measurements. This distance is converted to a hardness number. The preliminary test force is removed and the indenter is removed from the test specimen.
Preliminary test loads (preloads) range from 3 kgf (used in the "Superficial" Rockwell scale) to 10 kgf (used in the "Regular" Rockwell scale). Total test forces range from 15kgf to 150 kgf (superficial and regular) to 500 to 3000 kgf (macrohardness).
Test Method Illustration
A = Depth reached by indenter after application of preload (minor load)
B = Position of indenter during Total load, Minor plus Major loads
C = Final position reached by indenter after elastic recovery of sample material
D = Distance measurement taken representing difference between preload and major load position. This distance is used to calculate the Rockwell Hardness Number.
Rockwell Hardness Testing Loads
A variety of indenters may be used: conical diamond with a round tip for harder metals to ball indenters ranges with a diameter ranging from 1/16" to ½" for softer materials.
When selecting a Rockwell scale, a general guide is to select the scale that specifies the largest load and the largest indenter possible without exceeding defined operation conditions and accounting for conditions that may influence the test result. These conditions include test specimens that are below the minimum thickness for the depth of indentation; a test impression that falls too close to the edge of the specimen or another impression; or testing on cylindrical specimens.
Additionally, the test axis should be within 2-degress of perpendicular to ensure precise loading; there should be no deflection of the test sample or tester during the loading application from conditions such as dirt under the test specimen or on the elevating screw. It is important to keep the surface finish clean and decarburization from heat treatment should be removed.
Sheet metal can be too thin and too soft for testing on a particular Rockwell scale without exceeding minimum thickness requirements and potentially indenting the test anvil. In this case a diamond anvil can be used to provide a consistent influence of the result.
Another special case in testing cold rolled sheet metal is that work hardening can create a gradient of hardness through the sample so any test is measuring the average of the hardness over the depth of indentation effect. In this case any Rockwell test result is going to be subject to doubt, there is often a history of testing using a particular scale on a particular material that operators are used to and able to functionally interpret.
For more information about Rockwell hardness testing , please contact withus.
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