C: Dimensions: f20*141mm, weight: 75g. The impact energy is small, and it is used to measure small, light and thin parts and surface hardened layers.
G: Dimensions: f30*254mm, weight: 250g. The impact energy is large and the requirements on the measuring surface are low. Used for large, thick and rough forged castings.
E: Dimensions: f20*162, weight 80g. The indenter is made of artificial diamond and is used to measure the hardness of materials.
DL: Overall dimensions: f20*202mm, weight: 80g. The head is small and used for measuring the hardness of narrow grooves and gear surfaces. Use of special-shaped support rings
In field work, we often encounter curved specimens. Curved surfaces have different effects on the hardness test results. When operated correctly, the position where the impact falls on the surface of the specimen is the same as that of the flat specimen, so the support ring is universal.
However, when the curvature is small enough, the impact body’s rebound speed will be low due to the difference in elastic state of deformation due to plane conditions, resulting in a low Leeb hardness indication.
Therefore, for specimens, it is recommended to use small support rings when measuring. For specimens with small curvature radius, it is recommended to use special-shaped support rings.
