Interpretation of 12Cr5MoⅠ and 12C5rMoNT
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In the GB9948 standards for 12Cr5MoⅠ and 12Cr5MoNT, what do the “Ⅰ” and “NT” after “Mo” signify?
The “Ⅰ” in 12Cr5MoⅠ denotes a specific grade type, sometimes also referred to as a \"grade model\"; it represents specific requirements regarding the chemical composition, mechanical properties, and dimensional specifications of the material； In 12C5rMoNT, the “NT” denotes special technical requirements or modified versions of standards; it is typically used to indicate material specifications for specific applications or minor adjustments to existing standards. .
Section 6.1.1 of GB9948 describes the heat treatment categories at the time of supply.
Thank you, I found it – “Ⅰ” means annealed； And in 12C5rMoNT, the “NT” stands for normalizing + tempering
Thank you; I checked the standards and it is a heat treatment requirement.
Is the “Ⅰ” in 12Cr5MoⅠ the Roman numeral “Ⅰ”? Does it have any special meaning?