Equotip - Portable Metal Hardness Testers (2023)

FAQs

What is the price of Equotip 550 leeb? ›

Digital Equotip 550 Leeb Hardness Tester, HL, 4 Hld at Rs 775000/set in Rajkot.

A comparison of the results of Brinell hardness test is shown in Fig. 2. The hardness measured by the desk hard- ness tester differs from the reference hardness minimally (–1.03 %). The hardness determined by the portable hard- ness testers differs from the reference hardness by –3.90 %, respectively –5.95 %.

A Brinell hardness tester can test all types of metals. Some consider the results of the Brinell method more accurate and reliable than those obtained by the Rockwell method because of the use of a spherical indenter that distributes pressure evenly.

The Brinell hardness scale is a widely accepted measure of hardness in materials. It involves pressing a ball of steel (or tungsten carbide for harder materials) into the test piece at a constant and known force. The softer the material, the deeper the ball will penetrate and vice versa.

The Rockwell hardness test measures the hardness of metallic materials in the simplest possible way, i.e. by pressing an indenter into the surface of the material with a specific load and then measuring how far the indenter has penetrated. Most of the time, the indenter is a steel ball or a diamond.

The Rockwell hardness test is the most widely used technique, easy to carry out and more precise than other kinds of evaluations. The Brinell hardness test is typically used to evaluate materials that are too coarse or that have an exterior that is too rough for other test techniques.

Rockwell hardness testers are the most commonly used of all the types of hardness testers. The Rockwell method offers a quick and accurate measure of hardness on almost all metals and some plastics (see Rockwell scales below).

The main disadvantage of this test is that it is not suitable for small size objects due to large indentor impression. Slightly inaccurate hardness measurement while testing hard objects as ball indentor deforms. Not suitable for thin objects due to deep penetration. This test can only perform on the flat surfaces.

Vickers Hardness Test

This test is done with less force and more accuracy than the Brinell or Rockwell tests. It uses an even smaller diamond indenter than a Rockwell machine. The Vickers test has an optical system that enables magnification of the material's target area.

Purpose: Strong Cobb Hardness Tester Model SHT - 17 is used for finding the Hardness of Tablets in Kg. per sq.cm.

What is the difference between Rockwell B and C hardness test? ›

The Rockwell C scale is good for measuring hardened steel. Rockwell B is better for softer steel or relatively hard aluminum. For softer aluminum, you may need to use the Rockwell E scale (1/8-inch diameter ball with a 100 kg load) or the Rockwell F scale (1/16-inch diameter ball with a 60-kg load).

Tungsten

Furthermore, it has the highest tensile strength at 1650°C. Apart from this, it has an atomic number 74 in the periodic table. The melting point at 3410°C and boiling point at 5530°C. As a result, the Tungsten is one of the hardest metal present on earth.

The Rockwell method has the following disadvantages:

It is not always the most accurate hardness testing method, as even a small differential depth measurement error can lead to a significant error in the calculated hardness value.

Rockwell Hardness Test

Quicker and cheaper than the Brinell and Vickers tests, the Rockwell test requires no material prep, and hardness value is easily readable without any extra equipment, making this one of the most commonly used methods of measuring metal hardness.

In situations where the user must choose the appropriate Rockwell scale, there are several factors that should be considered. These include the type of test material, the test material thickness, the test material area or width, the test material homogeneity, and the limitations of each Rockwell scale.

There are two principal methods of testing the hardness of a material – scratch testing and indentation testing. Indentation testing can only be used on materials that undergo plastic deformation such as metals and thermoplastic polymers. Scratch testing is therefore used for brittle materials such as ceramics.

Fill the bottle one-third full, add a few drops of pure liquid soap and shake vigorously for a few seconds. If there is a distinct lack of fluffy bubbles and the water appears cloudy and/or milky, your water is hard.

The earliest form was introduced in 1859 and was based on the force required to produce a 3.5 mm indent in the test material. The depth was measured with a vernier scale system and the total weight needed to reach the 3.5 mm was indicated as the hardness.

Diamond is the hardest known material to date, with a Vickers hardness in the range of 70–150 GPa.

What is the difference between Rockwell and shore hardness? ›

Shore A is usually used for flexible materials, and Shore D is used for semi-flexible materials. Rockwell hardness is generally chosen for 'harder' plastics such as nylon, polycarbonate, polystyrene, and acetal.

One of the most common indentation hardness tests used today is the Rockwell hardness test. Although less widespread, the Brinell and Vickers hardness tests are also utilized. Most indentation hardness tests measure the deformation that occurs when the material being tested is penetrated with an indenter.

10mm ( 0.5 inch ) or greater is recommended.

Readings taken too close together will give false (higher) hardness readings. This is also true on the test (calibration) blocks, where often one tries to place too many readings in one area to save the cost of buying a new block. Indentations should be spaced per ASTM E18 – three diameters apart.

Tablet hardness tester pfizer type is handy and portable instrument to test the hardness of the tablets which are used in laboratories to test the lot of tablets during its manufacturing process to observe the hardness of the tablets as per pharmacology standards.

The Vickers method has the following disadvantages:

The process is rather slow (compared with the Rockwell method). The test cycle takes somewhere between 30 and 60 seconds, not including the time taken to prepare the specimen.

The Vickers hardness test is often regarded as easier to use than other hardness tests: The process can be performed on a universal or micro hardness tester; the required calculations are independent of the size of the indenter; and the same indenter (a pyramidal diamond) can be used for all materials, irrespective of ...

Our own UHC (Ultra High Carbon) steel measures around 62-63 HRC.

Explanation: Most widely used hardness test is a Rockwell test in the US.

One Drawback of Portable Hardness Testers

If a part needs to be certified, then traditional benchtop hardness testing is required. ASTM is discussing certification standards for portable hardness testers, but currently parts and materials can only be certified with stationary hardness testers.

Is hardness test reliable? ›

The accuracy of the measurement depends on the contact between the indenter and the sample surface. If there are impurities on the supporting surface, deformation may occur when the test load is applied and the measurement may be erroneous. This method is less accurate for hard materials.

With the precise nature of the test (keeping in mind that one Rockwell point on the regular scale equals 0.002 mm or 0.00008 of an inch) a movement of only 0.001 of an inch could cause an error of over 10 Rockwell points.

Measuring range: 200-960 HL.

The Brinell hardness testing uses a 10mm hardened steel ball, while the Rockwell test uses either a much smaller steel ball (<4mm) or a diamond cone, depending on the material being tested. The Rockwell test measure the depth of the indentation, while the Brinell test measures the width of the indentation.

WHAT IS A GOOD ROCKWELL SCALE RATING FOR KITCHEN KNIVES? The best quality chef knives have a Rockwell Hardness Rating or HRC rating of 60 and above. This means the steel is hard, retains its edge for a long time, but may also be slightly more brittle than other knives.