If you have purchased or are looking to purchase a hardness tester, you will also need a hardness test block. CHardness test blocks used to verify the performance of a hardness tester and provide data for calibration of the hardness tester. Depending on your internal processes, you may need a number of different test blocks and hardness scales. If you are a purchasing agent or engineer who has not purchased a hardness tester or hardness test blocks, the process of determining what you need can be a bit confusing. That is why there is a Guide hardness tester buying guide , The balanceAbout after-sales support of hardness tester and here is the Hardness Test Block Guide.

Hardness testing provides critical information and insight into the durability, strength and flexibility of materials. It plays a key role in ensuring structural integrity and assessing component quality in many industries. SEMIKI's industry-leading hardness test blocks ensure accuracy, integrity and traceability in hardness testing processes. A comprehensive range of scales and blocks, relevant to testing Rockwell, Brinell, Knoop and Vickers, reflecting SEMIKI's commitment to designing a safe and efficient world through advanced hardness testing solutions.

hardness scale YAMAMOTO

To ensure the accuracy of hardness test results, it is mandatory to verify the accuracy of the test results. hardness tester Different hardness testing standards have different calibration testing frequencies, but all require prior calibration evaluation.

Verifying the calibration of a hardness tester is as simple as using a test block. The test block contains a certified hardness number corresponding to a specific force for a particular hardness test. However, understanding the defined levels can become confusing.

ASTM E18 provides detailed information on Rockwell hardness testing and is very clear in the selection of test blocks. The equipment must be validated daily using a test block within 15 Rockwell points of the specimen being tested. 

Hardness standard sample YAMAMOTO HRBS 90

Rockwell

Daily inspections according to ASTME18 & ISO 6508-1:

• Each Rockwell scale used must be checked daily.
• At least one test block must have an expected hardness difference of +/- 15 HR.
• Alternatively, two test blocks can be used, one with a higher and one with a lower hardness than the expected hardness to be measured.

Indirect testing according to ASTM E18 & ISO 6508-2:

• Indirect validation will use three test blocks for each scale to be validated (one high range, one mid range, and one low range) with a difference of at least 5 HR between them.
• The Rockwell hardness values in the high, medium, and low ranges depend on the Rockwell hardness scale.
• If all three ranges are not available, use the available range and verify a different scale with the same test force using all three ranges (high, medium, and low).

Vickers and Knoop

Daily inspections according to ASTM E92 & E384, ISO 6507-1 & 4545-1:

• Daily checks must be performed: for each Vickers and/or Knoop scale used (ASTM E92), for each measuring instrument used (ASTM E384), and for each test force used (ISO 6507-1 and ISO 4545-1).
• At least one test block must have a hardness value close to that of the material being measured.

Indirect verification according to ASTM E92 & E384:

• Indirect verification must meet the following criteria:
  1. A minimum of two test blocks, with at least one test block for each scale, must be verified.
  2. At least two test blocks must have different hardness levels.
  3. The difference between the two blocks must be at least 100 points.
  4. The highest test force will be verified on a block from the lower hardness range to produce the largest indentation size. The lowest force will be verified on a block from the higher hardness range to produce the smallest indentation size.

Vickers & Knoop hardness range:

Low range: <240 HV <250 HK

Mid-range: 240-600 HV 250-650 HK

High range: >600 HV >650 HK

Brinell

Daily inspection according to ASTM E10 & ISO 6506-1:

• Each Brinell scale in use must be inspected daily.
• At least one test block should have a hardness close to that of the material to be used.

Indirect testing according to ASTM E10 & ISO 6506-2:

• Indirect verification must meet the following criteria:
  1. A minimum of two test blocks, with at least one test block for each test force, must be verified.
  2. At least two test blocks, one at the low range and one at the high range, will be used for each indentation ball size.
  3. When more than one scale uses the same indentation tip size, the highest test force will be verified on a block from the lower hardness range to produce the largest indentation size, and the lowest test force will be verified on a block from the higher hardness range to produce the smallest indentation size.
  4. Each test block must be calibrated to one of the specific Brinell scales (a combination of probe size and test force) being verified.

SEMIKI is a market leader in supplying material hardness testers from Japanese manufacturers such as Mitutoyo, Futuretech… and hardness standard samples of Yamamoto Used to recalibrate the scale of hardness testers; widely used by many factories.

CONTACT:

SEMIKI Measuring Equipment Company Limited
Email: [email protected]
Phone: +84 9797 61016