It seems like you are looking for information about the steel grade A400-69(2012) and its properties. Unfortunately, without more specific details or access to the exact documentation, it is difficult to provide specific information about its chemical composition, mechanical properties, or corresponding standard number.
Generally, steel grades are defined by their chemical composition and mechanical properties, which determine their strength, durability, and suitability for specific applications. The corresponding standard number refers to the specific standard or specification that defines the requirements for the steel grade.
To obtain detailed information about A400-69(2012) steel grade, it would be best to refer to the corresponding technical documentation, such as the official standard or specification that defines this steel grade. Additionally, consulting with experts in the field of materials engineering or conducting a thorough literature search may provide further insights into the properties and applications of this particular steel grade.