What is metal hardness?
The ability of a metal or metal alloy to resist plastic deformation in specific localized areas rather than in general locations is described as hardness. It is also the metal’s resistance to dents, scratches, or abrasions.
Hardness is an important property because a metal’s ability to resist wear is directly proportional to its hardness. Within a specific kind of metal, hardness levels may vary depending on alloying elements, heat treatment, work hardening, and other hardening processes used.
Because hardness varies between metals and even within the same metal group, hardness measurement methods such as Brinell and Rockwell hardness were developed to provide a common understanding of hardness levels.
What is Brinell hardness?
Brinell hardness is a scale that assigns a numerical value to the hardness level of a material. ASTM E10 details the procedure for performing Brinell hardness testing. The test is performed by pressing a certified Brinell indenter against the metal under a specified load for a predetermined length of time. All of this is described in order to limit the possibility that changes in experimental technique affect the results. For steel and other similar materials, the indenter is usually a 10 mm hardened steel ball with a pressure of 3,000 kg.
Testing will vary depending on whether the material is softer or tougher. After stressing the metal, the indenter is withdrawn and the width of the resulting indentation is measured using a microscope. The indentation measurement can then be converted to a Brinell hardness value using the Brinell hardness scale.
What is Rockwell hardness?
Rockwell hardness is similar to Brinell hardness and is used to determine the numerical hardness of a material. Rockwell hardness test and Rockwell hardness scale are used for this purpose. ASTM E18 specifies specific procedures. The Rockwell hardness test, like the Brinell hardness test, uses an indenter of a given size to apply a predetermined force for a certain period of time. Convert indentation measurements to Rockwell hardness values using the Rockwell hardness scale.
What is the difference between Rockwell test and Brinell test?
While there are similarities between the two tests, there are several important differences, as follows:
Depending on the material being evaluated, the Brinell test uses a 10 mm hardened steel ball, while the Rockwell test uses a 4 mm steel ball or a diamond cone.
The Rockwell test determines the depth of the indentation, while the Brinell test determines its width. Preload is used in Rockwell hardness testing to create a zero position before the main load is applied. The main load is then removed, leaving only the preload. Rockwell test equipment then measures the distance traveled.
It is also worth noting that Rockwell and Brinell hardness have different conversion standards and should not be used interchangeably.
Where are Brinell and Rockwell hardness tests used?
Brinell and Rockwell hardness tests are used in almost every industry. They are important in determining whether metals and other materials can withstand dents, abrasions, scratches and other types of wear and tear in a specific application. Materials from engine pistons, jet turbine blades, ship hulls, bronze fixtures, rail car wheels, and many other components that may be exposed to wear conditions are just a few examples.
Tianjin Anton Metal Manufacture Co., Ltd. is a company specializing in the production of various nickel-based alloys, Hastelloy alloys and high-temperature alloy materials. The company was established in 1989 with a registered capital of 10.0 million, specializing in the production and sales of alloy materials. Anton Metal’s products are widely used in aerospace, chemical industry, electric power, automobile, nuclear energy and other fields, and can also provide customized alloy material solutions according to customer needs. If you need to know the price consultation of alloy materials or provide customized alloy material solutions, please feel free to contact the sales staff.
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Post time: Jan-08-2024
