Hardness Test

Introduction:

Hardness testing is an important indicator of the performance of the test material, and one of the fastest and most economical way.Hardness test can reflect material differences in the chemical composition, structure and treatment process.Hardness tests are often used in various industries as a means of supervision.

Classification:

Rockwell hardness, Vickers hardness, Micro Vickers hardness, Brinell hardness, Shore hardness, nano-indentation hardness, Shore hardness, etc.

Rockwell hardness

Introduction:

Rockwell hardness no units, is a dimensionless of mechanical properties, the most common hardness scales have A, B, C, R, M, L,etc., usually referred to as HRA, HRB, HRC,etc., with its representation of hardness data + hardness symbols, e.g. 50HRC.

Testing standards:

ASTM E18, GB / T 230.1, ASTM D785, ISO 2039-2, GB / T 3398.2 etc.

Vickers hardness

Introduction:

Vickers hardness is usually expressed as follows: 600HV30 / 20, the value at the front of V for the hardness value,test force behind V, if the test force to keep the time is not usually 10 to 15 seconds, still need to mark holding time after the test force value. Such as: 600HV30 / 20 --- test using a force of 30 kgf for 20 seconds to obtain a hardness value of 600.

Testing standards:

GB / T 4340.1, ISO 6507, ASTM E384 etc.

Brinell hardness

Introduction:

The symbol of Brinell hardness is represented by HBS or HBW. Apply to cast iron, non-ferrous alloy and various annealing and quenching and tempering of steel, shoulds not be too hard, too small and too thin and the surface of the samples or artifacts are not allowed to have larger creasing.

Testing standards:

GB / T 231.1, ASTM E10