Hardness testing methods for the surface of mechanical gate valve cores
One, Introduction
In the manufacturing process of mechanical gate valves, the hardness testing of the valve core surface is an important link to ensure product performance and quality. The hardness testing of the surface not only evaluates the wear resistance and corrosion resistance of the valve core material but also provides a scientific basis for the wear and corrosion conditions of the product in actual application. This article will discuss in detail the hardness testing methods of the surface of the valve core of mechanical gate valves, including common methods, detection equipment, and detection standards.
Two, Common Detection Methods
Brinell hardness testing method
The Brinell hardness testing method determines the hardness of materials by measuring the size of the indentation diameter through indentation on the surface of the sample. This method is suitable for testing the hardness of materials, especially suitable for testing materials with high hardness or significant hardness changes. When testing the hardness of valve cores, standard Brinell hardness testers can be used for testing.
Rockwell hardness testing method
The Rockwell hardness testing method determines the hardness of materials by measuring the indentation depth through indentation on the surface of the sample. This method is suitable for testing the hardness of materials, especially suitable for testing materials with low hardness or minor hardness changes. When testing the hardness of valve cores, standard Rockwell hardness testers can be used for testing.
Vickers hardness testing method
The Vickers hardness testing method determines the hardness of materials by measuring the indentation area through indentation on the surface of the sample. This method is suitable for testing the hardness of materials, especially suitable for testing materials with high hardness or significant hardness changes. When testing the hardness of valve cores, standard Vickers hardness testers can be used for testing.
Leeb hardness testing method
The Leeb hardness testing method determines the hardness of materials by measuring the indentation depth and hardness value through indentation on the surface of the sample. This method is suitable for testing the hardness of materials, especially suitable for testing materials with low hardness or minor hardness changes. When testing the hardness of valve cores, standard Leeb hardness testers can be used for testing.
Three, Detection Equipment
Brinell hardness tester
The Brinell hardness tester is mainly used for testing the hardness of materials, especially suitable for testing materials with high hardness or significant hardness changes. The Brinell hardness tester consists mainly of a punch, a probe, a sample holder, and a reading device. When in use, the sample is fixed on the sample holder, the punch is pressed into the surface of the sample, and the indentation diameter is read to determine the Brinell hardness of the material.
Rockwell hardness tester
The Rockwell hardness tester is mainly used for testing the hardness of materials, especially suitable for testing materials with low hardness or minor hardness changes. The Rockwell hardness tester consists mainly of a punch, a probe, a sample holder, and a reading device. When in use, the sample is fixed on the sample holder, the punch is pressed into the surface of the sample, and the indentation depth is read to determine the Rockwell hardness of the material.
Vickers hardness tester
The Vickers hardness tester is mainly used for testing the hardness of materials, especially suitable for testing materials with high hardness or significant hardness changes. The Vickers hardness tester consists mainly of a punch, a probe, a sample holder, and a reading device. When in use, the sample is fixed on the sample holder, the punch is pressed into the surface of the sample, and the indentation area is read to determine the Vickers hardness of the material.
Leeb hardness tester
The Leeb hardness tester is mainly used for testing the hardness of materials, especially suitable for testing materials with lower hardness or smaller hardness changes. The Leeb hardness tester consists mainly of a pressure head, a pressure pin, a sample holder, and a reading device. When in use, the sample is fixed on the sample holder, the pressure head is pressed into the surface of the sample, and the indentation depth and hardness value are read to determine the Leeb hardness of the material.
IV. Testing Standards
GB/T 230.1-2018 ‘Metal Materials – Brinell Hardness Testing – Part 1: Test Method’
GB/T 230.2-2018 ‘Metal Materials – Brinell Hardness Testing – Part 2:Measurement Method’
GB/T 230.3-2018 ‘Metal Materials – Rockwell Hardness Testing – Part 3: Test Method’
GB/T 230.4-2018 ‘Metal Materials – Rockwell Hardness Testing – Part 4:Measurement Method’
GB/T 230.5-2018 ‘Metal Materials – Vickers Hardness Testing – Part 5: Test Method’
GB/T 230.6-2018 ‘Metal Materials – Vickers Hardness Testing – Part 6:Measurement Method’
GB/T 230.7-2018 ‘Metal Materials – Leeb Hardness Testing – Part 7: Test Method’
GB/T 230.8-2018 ‘Metal Materials – Leeb Hardness Testing – Part 8:Measurement Method’
V. Conclusion
The surface hardness test of the mechanical valve plug is an important link to ensure the performance and quality of the product. The Brinell hardness test method, Rockwell hardness test method, Vickers hardness test method, and Leeb hardness test method are commonly used testing methods. The testing equipment includes Brinell hardness tester, Rockwell hardness tester, Vickers hardness tester, and Leeb hardness tester. The testing standards include GB/T 230.1-2018 ‘Metal Materials – Brinell Hardness Testing – Part 1: Test Method’, GB/T 230.2-2018 ‘Metal Materials – Brinell Hardness Testing – Part 2:Measurement Method’, GB/T 230.3-2018 ‘Metal Materials – Rockwell Hardness Testing – Part 3: Test Method’, GB/T 230.4-2018 ‘Metal Materials – Rockwell Hardness Testing – Part 4:Measurement Method’, GB/T 230.5-2018 ‘Metal Materials – Vickers Hardness Testing – Part 5: Test Method’, GB/T 230.6-2018 ‘Metal Materials – Vickers Hardness Testing – Part 6:Measurement Method’, GB/T 230.7-2018 ‘Metal Materials – Leeb Hardness Testing – Part 7: Test Method’, and GB/T 230.8-2018 ‘Metal Materials – Leeb Hardness Testing – Part 8:Measurement Method’, etc. Through scientific and reasonable testing methods and equipment, the hardness of the valve plug surface can be effectively tested, providing a scientific basis for product quality control.