# Vicker hardness block calibration service

With the aim of serving customers with the best after-sales services, EMIN Vietnam has established the Equipment Inspection - Calibration - Repair Service Center. With the support from numerous equipment manufacturers in the world, EMIN Vietnam possesses well-prepared calibrating instruments. EMIN Vietnam has successfully repaired and calibrated specialized equipment in Vietnam, ensuring the quickness, effectiveness and convenience for customers. Only few technical trading company in Vietnam do possess this technical capacity including EMIN Vietnam.

>> Vicker Hardness Tester
This method is considered to be the easiest of all types of hardness meters, applicable to all metal surfaces, especially extremely hard materials. With a standard hardness in scientific research. Mainly used in laboratories and research.

>> Other information
The Vickers hardness test was invented in 1922 by engineers Smith and Sandland, in the UK. As an alternative to Brinell hardness method.

The hardness index is determined by the weight on the surface area of ​​the dent rather than the area that is loaded, and therefore not the pressure.

♦ Application range:
- Measuring the hardness of small and accurate details

- Measure thin sheet materials

- Measure the surface of the coating material

♦ Vickers hardness measurement principle
- The calculations of the Vickers hardness test do not depend on the size of the test head. The test head can be used for all materials. Test using a standard sized 4-sided pyramidal diamond test tip with an angle between opposite planes of 136 ° (± 3 °).

- The test tip is pressed against the material under the effect of loads 50N, 100N, 200N, 300N, 500N, 1000N.

- After cutting the load, measure the diagonal d of the indentation, and check according to the table there will be the Vickers hardness value (or the value given on the screen if using the numeric display).

- Vickers hardness is calculated by F / S. Divide the test force F by the concave surface area S. Concave surface S is calculated by the average length of the two diagonal lines d. A concave surface is formed when a force is applied to a test piece with a diamond, pyramidal punch.

♦ In summary, the Vickers hardness method:
- Use a measuring tip / scale for all materials

- The tip shape is chosen to copy the Brinell hardness result (at d / D = 0.375).

- Measuring capacity: 1 - 120 kg (Macro); <1 kg (Micro)

- Usual measuring loads 1 - 50 kg (initially up to 120 kg are used)