Question 1

What could be the reason why no indentation is visible after measuring with a Vickers hardness tester?

Accepted Answer

Taiwan Nakazawa Co., Ltd. answers for you: You should start by adjusting the microscope focal length and the lighting. If the indentation is still invisible or unclear after adjustment, please contact us to request a repair, after which our technicians will diagnose the issue and perform maintenance.

Question 2

What are the advantages of Vickers hardness testers?

Accepted Answer

The indentation of a Vickers hardness tester is square with a clear contour, and the measurement of the diagonals is very accurate. Therefore, generally speaking, the Vickers hardness test is a hardness measurement method with high precision among commonly used hardness testing methods, and its repeatability is also excellent, which the Brinell hardness tester cannot surpass in this regard.
The Vickers hardness test can measure almost all metal materials currently used in industry, from very soft metal materials (with only a few Vickers hardness units) to very hard metal materials (over 3,000 Vickers hardness units).

This Vickers hardness tester of our company is a representative product, a model that has achieved an extremely high market share with an overwhelming advantage. It is suitable for metal and scientific research hardness testing in various fields. Friends in need are welcome to visit Taiwan Nakazawa Co., Ltd. for further details.

Question 3

What are the main advantages of Vickers hardness testers?

Accepted Answer

Taiwan Nakazawa Co., Ltd. answers for you: The main advantage of the Vickers hardness tester is that the hardness value is basically independent of the test force. As long as the material is very uniform, the test force can be chosen arbitrarily, but the measured hardness value remains unchanged. This is equivalent to having a unified scale across a broad range of hardness.
The Rockwell hardness test can only use different test forces based on different hardness requirements. In the low to medium hardness range, for the same metal material with relatively uniform hardness, the hardness values obtained from Vickers and Brinell hardness tests are basically approximate. For example, when the hardness value is below 400, $HV \approx HB$. On the other hand, the test force of a Vickers hardness tester can be as small as only 10gf, making the indentation very small and particularly suitable for measuring relatively thin materials.

Question 4

What are the advantages of Vickers hardness testing?

Accepted Answer

1. High measurement precision: The indentation of the Vickers hardness test is square with a clear contour, and the measurement of the diagonals is accurate. Therefore, the Vickers hardness tester has higher precision among commonly used hardness methods, and its repeatability is also very good, which is superior to the Brinell hardness tester.
2. Wide measurement range: The Vickers hardness tester has a wide measurement range and can measure almost all metal materials used in industry today, from very soft materials (a few Vickers hardness units) to very hard materials (3,000 Vickers hardness units).

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 5

What are the advantages of using a Vickers hardness tester for testing?

Accepted Answer

Stable measurement standards: The main advantage of the Vickers hardness test lies in the fact that its hardness value is independent of the magnitude of the force. As long as the material has uniform hardness, the force can be chosen arbitrarily while the hardness value remains unchanged. This is equivalent to having a unified scale across a broad range of hardness. In this regard, it is superior to Rockwell hardness.
In the low to medium hardness range, on the same uniform material, the results of Vickers and Brinell hardness tests will yield approximate hardness values. For example, when the hardness value is below 400, $HV \approx HB$. The force of a Vickers hardness tester can be as small as 10gf, and the indentation is very small, making it particularly suitable for testing thin and small materials.

Our company is a firm specializing in providing metal detection and analysis instruments, producing high-quality products such as metallographic pre-processing equipment, metallographic cutting machines, metallographic mounting machines, micro-Vickers hardness testers, and Rockwell hardness testers. Welcome to Taiwan Nakazawa Co., Ltd. to make your purchase.

Question 6

What are the applications of the Vickers hardness tester?

Accepted Answer

Taiwan Nakazawa answers for you: Vickers hardness testing is mainly used in material research and scientific experiments. Small-load Vickers hardness testing is primarily used to test the hardness of small precision parts, the hardness and effective depth of surface-hardened layers, surface hardness, the hardness of thin sheets and fine wires, the hardness near blade edges, and the hardness of dental materials, etc. Since the test force is very small and the indentation is also very small, the appearance and performance of the specimen remain unaffected.
Micro-Vickers hardness is mainly used for research in metallurgy and metallography. It is used to determine the hardness of each constituent phase in the metal structure and to study the brittleness of refractory compounds, etc. Micro-Vickers hardness testers are also used for testing extremely small or extremely thin parts, with part thickness as thin as 3μm.

Question 7

What are the main uses of a Vickers hardness tester?

Accepted Answer

Widely used for measuring the micro-hardness of tiny and thin specimens, surface infiltration and plating layers, and measuring the Knoop hardness of brittle and hard materials such as glass, ceramics, agate, and synthetic gemstones, it is an ideal hardness testing instrument for material research and testing in scientific research institutions, factories, and quality supervision departments.
Scope of application: Heat treatment, carbonization, quench-hardened layers, surface coatings, steel, non-ferrous metals, and tiny and thin parts, etc. When equipped with a Knoop indenter, it can measure the Knoop hardness of brittle and hard materials such as glass, ceramics, agate, and synthetic gemstones.

The hardness testers produced by our Taiwan Nakazawa Co., Ltd. have high precision and stable performance, with a complete range of hardness tester specifications and models suitable for various products and tests across all walks of life.

Question 8

How should the test force be selected for a Vickers hardness tester?

Accepted Answer

1. The selection of the Vickers hardness tester's test force should be based on the specimen type, specimen thickness, and expected hardness range. According to relevant standards, the thickness of the specimen or test layer must be at least 1.5 times the length of the indentation diagonal. After testing, no visible deformation marks should appear on the back of the specimen.
2. The indentation of the Vickers hardness test is square with a clear contour, and the diagonal measurement is accurate. Therefore, the Vickers hardness test has higher precision among commonly used hardness testing methods, and its repeatability is also very good.

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 9

What is the testing range of a Vickers hardness tester?

Accepted Answer

The Vickers hardness test has a very wide measurement range and can measure almost all metal materials currently used in industry, from very soft materials (a few Vickers hardness units) to very hard materials (3,000 Vickers hardness units).
The advantage of the Vickers hardness test lies in the fact that its hardness value is independent of the magnitude of the test force. As long as the material has uniform hardness, the test force can be chosen arbitrarily while the hardness value remains unchanged. This is equivalent to having a unified scale across a broad range of hardness.

Our company is a firm specializing in providing metal detection and analysis instruments, producing high-quality products such as metallographic pre-processing equipment, metallographic cutting machines, metallographic mounting machines, micro-Vickers hardness testers, and Rockwell hardness testers. Welcome to Taiwan Nakazawa Co., Ltd. to make your purchase.

Question 10

How should the test force of a Vickers hardness tester be selected?

Accepted Answer

The test force of the Vickers hardness test can be as small as 10gf, and the indentation is very small, making it particularly suitable for testing thin and small materials. However, the efficiency of the Vickers hardness test is relatively low, with high requirements for experimental techniques and the surface finish of the specimen. Usually, specialized specimen preparation is required, which is cumbersome and time-consuming, so it is typically used only in laboratories.
Vickers hardness testing is mainly used for material research and scientific experiments. Low-load Vickers hardness testing is primarily used for testing the hardness of small precision parts, the hardness and effective depth of surface-hardened layers, and the surface hardness of coatings, etc. Since the test force is very small and the indentation is also very small, the appearance and performance of the specimen remain unaffected.

The hardness testers produced by our Taiwan Nakazawa Co., Ltd. have high precision and stable performance, with a complete range of hardness tester specifications and models suitable for various products and tests across all walks of life.

Question 11

What materials are Vickers hardness testers suitable for measuring?

Accepted Answer

The Vickers hardness tester is suitable for the qualitative measurement of high-hardness material properties. If repeated testing is required, the repeated trials usually begin with cemented carbide inserts, and then gradually move to higher-hardness and more expensive inserts.
Modern insert geometry, high-rigidity tool holders, and precise machining routines enable lower-priced cemented carbide inserts to handle demanding cutting tasks. If cemented carbide inserts are not used, other inserts must be selected based on specific circumstances, but the vast variety of materials can still pose significant processing difficulties.

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 12

How to choose a suitable Rockwell hardness tester?

Accepted Answer

Rockwell hardness is a commonly used hardness, and the hardness measured by a Rockwell hardness tester is called Rockwell hardness.
Rockwell hardness unit: HR. Rockwell hardness is generally divided into regular Rockwell hardness and superficial Rockwell hardness. Rockwell scales: There are 15 scales for regular Rockwell hardness, which are: HRA, HRB, HRC, HRD, HRE, HRF, HRG, HRH, HRK, HRL, HRM, HRR, HRP, HRS, and HRV. There are 15 scales for superficial Rockwell hardness, which are: 15N, 15T, 15W, 15X, 15Y, 30N, 30T, 30W, 30X, 30Y, 45N, 45T, 45W, 45X, and 45Y. Among them, the commonly used Rockwell scales for plastics are: HRS, HRL, HRM, and HRR. You can select a Rockwell hardness tester according to actual requirements.

Friends in need are welcome to consult Taiwan Nakazawa Co., Ltd.

Question 13

How to choose the gauge for a Rockwell hardness tester?

Accepted Answer

Taiwan Nakazawa Co., Ltd. answers for you:
1. HRA scale (60 kg test force): Suitable for determining the hardness of hard or thin-hard materials, such as cemented carbides, case-hardened steel after carburizing, thin steel after hardening treatment, thin steel plates, etc. Under the HRC scale (150 kg test force), the diamond indenter with a 120-degree cone angle and a 0.2mm tip radius is easily damaged when pressed into the material surface; therefore, high-hardness materials like cemented carbide steel usually opt for the HRA scale.
2. HRB scale (100 kg test force): Suitable for medium-hardness materials, such as quenched low-carbon steel, medium-carbon steel, malleable cast iron, various copper materials, and various duralumin alloys after solution treatment. Under the applied force, creep behavior may last for a long time, causing the dial indicator to move quite slowly and affecting the measurement reading. Conversely, when the material hardness is greater than HRB100, the steel ball indenter may penetrate too shallowly, affecting measurement precision.
3. HRC scale (150 kg test force): More suitable for determining carbon steel, alloy steel, tool steel, die steel, chilled cast iron, pearlitic malleable cast iron, titanium alloys, etc., after quenching and low-temperature tempering. This is because when the material hardness is less than HRC20, if the HRC scale continues to be used, the diamond conical indenter will penetrate too deeply under the 150 kg test force, and the influence of the diamond indenter cone will increase, leading to a sliding phenomenon that affects measurement accuracy; therefore, it is necessary to switch to the HRB scale for measurement.

Question 14

What hardness tester should be used to test the hardness of cast iron?

Accepted Answer

Rockwell hardness testers can be used for the hardness testing of certain cast iron workpieces. While the HRB or HRF scales are often used for testing, it is preferable to use the HRE or HRK scales, as they utilize a 3.175mm diameter steel ball, which can provide better average readings than a 1.588mm diameter steel ball. For hard malleable cast iron materials, HRC is typically used; if the material is non-uniform, multiple data points can be measured and the average value taken.

Our company is a firm specializing in providing metal detection and analysis instruments, producing high-quality products such as metallographic pre-processing equipment, metallographic cutting machines, metallographic mounting machines, micro-Vickers hardness testers, and Rockwell hardness testers. Welcome to Taiwan Nakazawa Co., Ltd. to make your purchase.

Question 15

How can a Rockwell hardness tester be used to test stainless steel?

Accepted Answer

Taiwan Nakazawa Co., Ltd. answers for you: Rockwell hardness testers can be used to inspect stainless steel materials, which are usually supplied in states such as annealed, quenched, tempered, or solution-treated. Standards specify the corresponding upper and lower hardness limit values, and hardness testing typically employs the HRC or HRB scales. For austenitic and ferritic stainless steels, the HRB scale is used; for martensitic and precipitation-hardening stainless steels, the HRC scale is used. For stainless steel thin-walled tubes and sheet materials with a thickness of 1~2mm or less, the N scale or T scale should be adopted.

Question 16

What are the principles for using a Vickers hardness tester?

Accepted Answer

For all hardness testing methods, the basic principle is to observe the ability of an unknown material to resist plastic deformation.
The Vickers test is applicable to all metal materials and has a wide range of applications in hardness testing. In hardness testing, the unit of the hardness value is Vickers hardness (HV) or Diamond Pyramid Hardness (DPH). The indenter should have a specific geometric shape such that the produced indentation remains geometrically similar regardless of its size; furthermore, the indentation must have clearly defined boundary points for easy measurement. Additionally, the indenter must possess very high strength to resist its own deformation. A diamond indenter in the shape of a square-based pyramid can satisfy all of these requirements.

This Vickers hardness tester of our company is a representative product, a model that has achieved an extremely high market share with an overwhelming advantage. It is suitable for metal and scientific research hardness testing in various fields. Friends in need are welcome to visit Taiwan Nakazawa Co., Ltd. for further details.

Question 17

How much do you know about the test force values of a Vickers hardness tester?

Accepted Answer

Vickers hardness values are generally independent of the test force: for the same material, the Vickers hardness value may remain the same for test forces ranging from 500gf to 50kgf.
Vickers hardness testing plays an extremely important role in material analysis, quality control of production processes, and research and development outcomes. Hardness is essentially an empirical value; for many materials, it can be correlated with tensile strength and is also an indicator of wear resistance and ductility. When conducting hardness tests, to avoid mutual influence between different work-hardened zones, the distance between adjacent indentations must be greater than 3 times the length of the indentation diagonal.

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 18

What are the basic testing methods of a Rockwell hardness tester?

Accepted Answer

First, an initial test force is applied, and then a main test force is applied to reach the required total force value, after which it returns to the initial test force. The initial test force establishes the zero or reference point. Applying the main test force and holding it for a preset duration is to allow for elastic recovery. Then, the main test force is removed while the initial test force is still retained to determine the change relative to the zero or reference point, thereby obtaining the Rockwell hardness value.

Our company is a firm specializing in providing metal detection and analysis instruments, producing high-quality products such as metallographic pre-processing equipment, metallographic cutting machines, metallographic mounting machines, micro-Vickers hardness testers, and Rockwell hardness testers. Welcome to Taiwan Nakazawa Co., Ltd. to make your purchase.

Question 19

How to calibrate a Vickers hardness tester before use?

Accepted Answer

1. Calibration of the Vickers hardness tester before use generally involves measuring a standard block to see the difference between the actual measured value and the value of the standard hardness block. Generally, if it is within the error range, it is considered qualified.
2. The verification certificate for a Vickers hardness tester is generally issued by the metrology department and possesses authenticity.
3. In fact, if a metrological verification certificate is not required, simply measuring the standard block yourself is sufficient.

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 20

How should a Vickers hardness tester be calibrated before use?

Accepted Answer

1. Use a force sensor to measure the force (a small electronic balance can be used as a substitute if one is not available).
2. Use a micrometer scale to calibrate the magnification. If these two points are correct, then the occurrence of errors in your hardness tester's measurement results will basically be eliminated.

This Vickers hardness tester of our company is a representative product, a model that has achieved an extremely high market share with an overwhelming advantage. It is suitable for metal and scientific research hardness testing in various fields. Friends in need are welcome to visit Taiwan Nakazawa Co., Ltd. to learn more details.

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