Reduced iron is not steel , dear RR.
Your abstract divulges-
The hardness of the iron by hydrogen containing but a small percentage of impurities is about 70 Brinell
Even crap mild steel starts at HB120. Iron is starting to make a bit of a comeback in casting of high tech engine blocks but...it contains carbon...look up austenitic iron, or nodular iron. 5kg blocks of specially refracted iron doesn't make a process. This
"breakthrough" takes us back to pre Bessemer converters and the dangers inherent in using low tensile strength iron in even low pressure environments.