654877bd_erials_Science_and_Engineering__Significance
[Date] 1863 [Candidate Moment] Emile and Pierre Martin develop the Siemens-Martin open-hearth furnace process. [Significance] 
Produces large quantities of basic steel by heating a combination of steel scrap and iron ore with gas burners--helping to make steel the world's most recycled metal.
Greatest Moments in Materials Science and Engineering
Significance