Iso 15608 steel groups and sub groups

Hi am new to this site my first impression is that there is some really clever people and all seem willing to help,

My question is that of iso 15608, is some one willing to explain how to use it in the easiest possible way am learning and would like to learn the correct way, I see that on group 1 sub group 1.2 but if you go to 15614_1 there is no 1.2 correct if am wrong,

Thank you for your time

no, follow material grouping in ISO 15608.
See ISO 15614-1 2017 Section 8.3.1.

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