1. Steel having no specified minimum content of alloying elements.
2. Steel having a specified minimum copper content not exceeding 0.40%.
3. Steel having a maximum specified content as follows: manganese 1.65%, silicon 0.60%, copper 0.60%.
1. Steel having no specified minimum content of alloying elements.
2. Steel having a specified minimum copper content not exceeding 0.40%.
3. Steel having a maximum specified content as follows: manganese 1.65%, silicon 0.60%, copper 0.60%.