Metal hardness testing method

Refers to the metal surface hardness against other hard objects into more ability. Through hardness test can reflect the metal material in different chemical composition, organizational structure and heat treatment process under the condition of differences in performance, to determine the applicability of the material, or material for a specific purpose by hardening or softening treatment effect.

Metal hardness testing method on the Richter scale, shore hardness, brinell hardness, Webster's hardness, ultrasonic hardness, etc. The magnitude of the hardness and shore hardness, test in the test force is dynamic and impact, belongs to the dynamic test method. Brinell hardness, Webster's hardness, ultrasonic hardness belongs to static test method.

The principle of the test method, use scope is:

1, the magnitude of the hardness

Detection principle:

Using 1 mm punch from the sample surface rebound rate of hardness and impact velocity ratio calculation.

Scope of application:

Suitable for large metal parts and carbon steel pipe products, that is, quality of large objects.

2, shore hardness,

Detection principle:

Using the punch sets in the rebound height and fixed on the surface of the specimen height ratio calculated hardness.

Scope of application:

Application is more common in the industry of roll.

3, brinell hardness

Detection principle:

Mainly measurement principle of two kinds of indentation diameter and depth.

Scope of application:

In mild steel pipe standard, the most versatile brinell hardness.

4, Webster's hardness

Detection principle:

With pressure needle into the depth of the characterization of material hardness, define the pressure into the depth of 0.1 mm for a Webster's hardness.

Scope of application: widely used soft metal.

5, ultrasonic hardness

Detection principle:

The vickers is rectangular pyramid head vibration lever incentive to the free vibration frequency, analyte when the pressure head at a constant load and vertical at contact, resonate, and using the resonant frequency is calculated by measuring the hardness of content.

Applicable scope: is suitable for thin workpiece of nondestructive testing.

Hunan Great Steel Pipe Co.,ltd  could finish all the testing well.