Hardness refers to a material's ability to resist local deformation, particularly plastic deformation, indentation, or scratching. It is an indicator of the softness and hardness of materials. Vickers hardness,Brinell hardness, Rockwell hardness comparison table, collect it quickly!
Rockwell hardness to Vickers hardness conversion
(1)The formula for converting Rockwell hardness to Vickers hardness is:
This formula is converted by the ferrous metal hardness standard data published by our country, and its HRC error is basically within the range of ±0.4HRC, and its maximum error is only 0.9HRC, and the calculated HV error is up to ±15HV.
(2)The formula is obtained by analyzing the relationship curve between Rockwell hardness and Vickers hardness indentation depth
This formula is compared with the conversion value of the national standard experiment, and the error between the calculation result of the conversion formula and the standard experimental value is ±0.1HRC.
(3) According to the actual experimental data, the conversion between Rockwell hardness and Vickers hardness is discussed by linear regression method, and the formula is obtained:
This formula has a small range of use and large errors, but it is easy to calculate and can be used when accuracy is not required.
Rockwell hardness to Brinell hardness conversion
(1) The relationship between Brinell indentation and Rockwell indentation depth was analyzed.Derive the conversion formula
The calculation results are compared with the national standard experimental values, and the error between the conversion formula and the standard experimental values is ±0.1HRC.
(2) The formula is obtained by linear regression method according to the actual experimental data
The formula error is large, the range of use is small, but the calculation is simple, and it can be used when the accuracy is not required.
HRC/HB approximation conversion tips
hardness is higher than20HRC，1HRC≈10HB，
hardness below20HRC，1HRC≈11.5HB。
Note: For cutting processing, it can basically be converted uniformly1HRC≈10HB（The hardness of the workpiece material fluctuates)
Conversion of Brinell hardness to Vickers hardness
The relationship between Brinell hardness and Vickers hardness,Derive the formula
The conversion result of this formula is compared with the conversion value of the national standard, and the conversion error is ±2HV.
Brinell Hardness
With diameterDof quenched steel balls orCarbide ballsThe indenter is used to test the force accordinglyFPressed into the surface of the specimen, after the specified holding time, the test force is removed, and a diameter of one is obtaineddindentation. Divide the test force by the indentation surface area, and the resulting value is the Brinell hardness value, which is used for symbolsHBSor HBW said.
The difference between HBS and HBW is the difference in the indenter.HBS indicates that the indenter is a hardened steel ball, which is used to determine materials with a Brinell hardness value below 450, such asmild steel, gray cast iron and non-ferrous metals, etc. HBW means indenter is carbide, which is used to determine materials with a Brinell hardness value below 650.
A diamond cone or quenched steel ball with a cone top angle of 120° is used as an indenter and a load, and the specimen is pressed into the specimen under the action of 10kgf initial load and the total force load of 60, 100 or 150kgf (i.e., the initial load plus the main load).
Rockwell hardness testUsing three test forces, three indenters, they have a total of 9 combinations, corresponding to 9 scales of Rockwell hardness. The application of these 9 scales covers almost all commonly used metal materials. There are three commonly used types: HRA, HRB and HRC, of which HRC is the most widely used.
The principle of Vickers hardness measurement is similar to that of Brinell hardness. The diamond regular tetragonal pyramid indenter with a relative surface angle of 136° is used to press into the surface of the material with the specified test force F, and the test force is removed after maintaining the specified time, and the hardness value is expressed by the average pressure on the surface area of the regular tetragonal pyramid indentation, and the marking symbol is HV.
Vickers hardness measurement range is large, can measure hardness in the range of 10~1000HV, small indentation, generally used to measure thinner materials and carburizing, nitriding and other hardening layers.
