Chinese to Russian Tech/Engineering Mechanics / Mech Engineering nameplates making

Hello,

I can't understand the meaning of 钢号标注 in the following sentence: "方框内出厂编号、出厂日期现场确定后进行钢号标注". The According to the context, it seems to be a method of printing the data (by punching)on a metal plate, but I'm not sure.

Thanks,
Paul