What is Hardness of Ultra-high-carbon Steel - Damascus Steel - Definition

Rockwell hardness of Damascus steel depends on the current type of the steel, but it may be approximately 62-64 HRC Rockwell. Hardness of Ultra-high-carbon Steel – Damascus Steel

Ultra-high-carbon steel has approximately 1.25–2.0% carbon content. Steels that can be tempered to great hardness. This grade of steel could be used for hard steel products, such as truck springs, metal cutting tools and other special purposes like (non-industrial-purpose) knives, axles or punches. Most steels with more than 2.5% carbon content are made using powder metallurgy.

Ultra-high carbon steels (i.e., steels containing between 1 and 2.0% C and now known as UHCS) have extreme strength, sharpness and resilience. The early use of steel compositions containing carbon contents above the eutectoid level is found in ancient weapons from around the world. For example, both Damascus and Japanese sword steels are hypereutectoid steels. The room temperature mechanical properties of the ultra-high-carbon steels exhibited a yield strength of 900 MPa and an ultimate strength of 1100 MPa. This is a remarkable combination of strength and ductility and confirms the general statements made about the malleability of ancient Damascus steels.

Hardness of Ultra-high-carbon Steel – Damascus Steel

Rockwell hardness of Damascus steel depends on the current type of the steel, but it may be approximately 62-64 HRC Rockwell.

Rockwell hardness test is one of the most common indentation hardness tests, that has been developed for hardness testing. In contrast to Brinell test, the Rockwell tester measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). The minor load establishes the zero position. The major load is applied, then removed while still maintaining the minor load. The difference between depth of penetration before and after application of the major load is used to calculate the Rockwell hardness number. That is, the penetration depth and hardness are inversely proportional. The chief advantage of Rockwell hardness is its ability to display hardness values directly. The result is a dimensionless number noted as HRA, HRB, HRC, etc., where the last letter is the respective Rockwell scale.

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Damascus Steel

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