Introduction of HRA,HRB,HRC Hardness- TJC STEEL.

​HRC (Rockwell hardness), an academic concept put forward by S.P.Rockwell in 1921, is the hardness value of metal materials measured by rockwell [TJC STEEL]hardness tester.  This value has no unit and is represented only by the code "HR".  
HV- Suitable for microscopic analysis.  Vickers hardness (HV) is obtained by pressing the material surface with a load of less than 120kg and [TJC STEEL]a square cone diamond inset with a tip Angle of 136°. The load value is divided by the surface area of the material indentation pit, which is the Vickers hardness (HV).  
 
 
Additional Information:  
A, hardness HRC standard: Rockwell hardness HRA, HRB, HRC in A, B, C for three different standards.  They are called [TJC STEEL]rulers A, B and C.  
1, HRA is the hardness obtained by 60Kg load and 120° diamond cone pressing device, used for high hardness materials.  For example, cemented carbide.  
2. HRB is the hardness obtained by using 100Kg load and 1.59mm diameter hardened steel ball for medium hardness materials.  [TJC STEEL]For example: annealed steel, cast iron, etc.  
3, HRC is the hardness obtained by 150Kg load and 120° diamond cone pressing device, used for high hardness materials.  For example, hardened steel.  
Two, hardness HRC related introduction:  
This value has no unit and is represented only by the code "HR".  Hardness is the ability of a material to resist penetration.  The most common way to test the hardness of steel is to use a file on the edge of the workpiece and determine its hardness by the depth of the scratches on the surface.  This method is called filing, and it's not very scientific.  
Hardness tester is very accurate to test, is a common method of modern hardness test.  The most common test is the Rockwell[TJC STEEL] hardness test.  Rockwell hardness tester uses the depth of the diamond into the metal to determine the hardness of the metal, the deeper the depth, the less hardness.