by George Langford, Sc.D., Massachusetts Institute of Technology, Cambridge, MA, 1966
2005 by George Langford
Low Alloy Steels - Lesson 1 - Third specimen - Part I
Wrought iron at 100X etched This stock was  purchased as low carbon steel.

The first two photomicrographs were taken at 100X and with a Nital etch.

Wrought iron at 100X etched
What is the material & what cross sections are shown ?

The explanation is given on the next page.