Rockwell hardness testing

Rockwell hardness test is a rapid hardness test method.We will introduce you to the definition of rockwell hardness testing, practical information and how to use it to practice.

Rockwell hardness test overview:

Is typically used for larger sample
No optical reading
Can be used for advanced testing
Standard: ASTM E18, ISO and JIS Z 6508 to 2245

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Rockwell hardness test definitions

Rockwell hardness test is usually used as a production workshop or laboratory "quick test method, mainly is for metal material.But, can also be used for more advanced testing, for exampleThe jominy test (end quenching test).Due to the use of relatively high load of rockwell hardness testing generally only used for the geometric form larger sample.

Rockwell test calculation method

Can be measured by diamond or formed by tungsten carbide ball indentation depth for rockwell hardness test (HR).

head

Usually, when performing a rockwell hardness test using one of the five different head:

Diamond cone
Tungsten ball size (1/16, 1/8, 1/4 "or 1/2")

The main load

Usually, when performing a rockwell hardness test using 6 different main load of 1:

15 KGF, 30 KGF, 45 KGF, 60 KGF, 100 KGF or 150 KGF

Rockwell hardness will be divided into 30 different levels.Each of which is composed of various types of pressure head and the main load in different combinations, and each has its applicable particular material or application (for example, HRA, HRB, HRC, HR30N).

Rockwell hardness test method definition

Rockwell hardness test method using a variety of different levels to represent the degree of hardness, each grade by specific criteria, types of pressure head and load.

Rockwell hardness test method for example:

HRE 1/8 "diameter of tungsten carbide spherical head;The main load of 100 KGF
HR30N (surface rockwell 30 n level) : diamond cone head;30 KGF main load

The typical application of rockwell hardness level overview

Rockwell hardness test applications

Surface preparation

Before the application of rockwell hardness testing, must be conducted to treat the surface of the test material preparation or processing.Rockwell hardness test depends on the used surface conditions needed for the load.

Rockwell hardness test is typically used for macro hardness testing, such tests are usually defined as the use of KGF head load is less than or equal to 1.Therefore, usually only need to surface grinding, sometimes even without any preparation.

load

Embossing time: 2 to 6 seconds
ASTM: specimen thickness for both head are at least 10 times for indentation depth
ISO specimen thickness: diamond indenter: at least 10 times for indentation depth.Tungsten carbide head: at least 15 times for indentation depth

Jominy test

Jominy test (end quenching test) is used to determine the hardenability of steel standard test procedures, can use vickers or rockwell hardness test method is carried out.When choosing to use the test method, the standards should be considered, and the commonly used standard when choosing different hardness testing.

Detailed information about the jominy test method, please seeVickers hardness test page