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Tensile to Hardness Conversion per ISO 18265 Table Calculator

Engineering Materials
Strength of Materials and Applications

Conversion of hardness-to-hardness or hardness-to-tensile-strength values for unalloyed and low alloy steels and cast steel per. ISO 18265 - 2013

Hardness conversions are no substitute for direct measurements. WARNING - Hardness conversions are no substitute for direct measurements. These tables should be used with caution. Uncertainty values are not included in table data on conversions.

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^a Brinell hardness values up to 450 HB w Brinell hardness values up to 450 HB were determined using a steel ball indenter, those above this value were determined with a hardmetal ball.

NOTE 1 Values in parentheses are those lying outside the defined range of the standard test method but which may used as estimates.

NOTE 2 The value of the tension test are not based on method A (10.3 Testing rate based on close-loop control at the rate of the extension) in ISO 6892-1:2009

Hardness conversions available

• HV - Vicker Hardness
• HBW - Brinell Scale
• HRC - Rockwell Scale HRC
• HRA - Rockwell Scale HRA
• HR45N - Rockwell Scale HR45N
• HR30N - Rockwell Scale HR30N
• HR15N - Rockwell Scale HR15N
• HRB - Rockwell Scale HRB
• HRF - Rockwell Scale HRF
• HR45T - Rockwell Scale HR45T
• HR30T - Rockwell Scale HR30T
• HR15T -Rockwell Scale HR15T

While hardness-to-hardness conversion in conversion involves considerable scatter and syst lves considerable scatter and systematic errors, conversion ematic errors, conversion of hardness to tensile strength values produces even greater scattering. One reason for this is that a of hardness to tensile strength values produces even greater scattering. One reason for this is that a great uncertainty can be affected by microstructural changes (e.g. resulting from heat treatment or cold great uncertainty can be affected by microstructural changes (e.g. resulting from heat treatment or cold working) within even the same type of steel. working) within even the same type of steel.

The tensile strength values given in ISO 18265 - 2013 only approximate values which cannot take the place of the results of tensile testing.

Source:

• ISO 18265:2013, Metallic materials — Conversion of Metallic materials - Conversion of hardness values

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