How do you think the steel in these images was made?
Example1 (https://i.stack.imgur.com/oZLRM.jpg)
Example 2 (https://i.stack.imgur.com/jrDE7.jpg)
Example 3 (https://i.stack.imgur.com/fpl2d.jpg)
Example 4 (https://i.stack.imgur.com/U6uhE.jpg)
Example 5 (https://i.stack.imgur.com/cBjaj.jpg)
Example 6 (https://i.stack.imgur.com/P1TcC.jpg)
Example 7 (https://i.stack.imgur.com/x619Q.jpg)
Example 8 (https://i.stack.imgur.com/FUqWa.jpg)
phosphoric iron microstructure: